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Quantitative analyzing method for floor acceleration amplification factor based on instrumented buildings 认领 引用
1
作者 Wang Tao Pan Rui +2 位作者 Xu Guoshan Meng Liyan Liu Jisheng 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2026年第2期501-516,共16页
Precise analysis of the floor acceleration amplification(FAA)factor is crucial for accurately predicting the acceleration on acceleration-sensitive nonstructural components and estimating the seismic safety of nonstru... Precise analysis of the floor acceleration amplification(FAA)factor is crucial for accurately predicting the acceleration on acceleration-sensitive nonstructural components and estimating the seismic safety of nonstructural components.However,the existing literature on FAA did not analyze various influencing factors quantitatively.For solving this problem,one novel quantitative analyzing method of FAA considering various influencing factors in terms of structural type,structural height,site category,structural period,relative height and ground motion intensity based on instrumented buildings data from the Center for Engineering Strong Motion Data(CESMD)is proposed.The analysis results revealed that the site categories can significantly affect the FAA values of various types of structures,however,which has not been emphasized in previous studies.Correlation analysis reveals that the relative height is strongly correlated with the FAA,which is consistent with several seismic design codes.While,the parameters in terms of the site category,structural height and structural type also significantly correlated with the FAA.The results indicate that these three factors should be incorporated into the seismic design code.This study offers valuable insights and recommendations for the design of acceleration-sensitive nonstructural components in terms of FAA. 展开更多
关键词 floor acceleration amplification factor instrumented buildings acceleration-sensitive nonstructural components seismic performance site categories correlation analysis
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Effect of the amplification factor on seismic stability of expanded municipal solid waste landfills using the pseudo-dynamic method 认领 引用 被引量：7
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作者 Xiao-bo RUAN Shu-lin SUN Wen-liang LIU 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2013年第10期731-738,共8页
The evaluation of the seismic stability of an expanded municipal solid waste(MSW) landfill is very important in seismic prone zones.In this paper,the pseudo-dynamic method was used to calculate the average safety fact... The evaluation of the seismic stability of an expanded municipal solid waste(MSW) landfill is very important in seismic prone zones.In this paper,the pseudo-dynamic method was used to calculate the average safety factor for the expanded landfill with a trapezoidal berm based on under-berm failure conditions.Furthermore,the effects of the variation of parameters such as the amplification factor,seismic coefficient,height of berm,angle of back slope of berm,and depth of waste mass at the back slope on the seismic stability of the landfill were studied.The results indicated that the influences of the vertical seismic coefficient,height of berm,and angle of the back slope of the berm on the seismic stability of the landfill are weakened as the amplification factor increases,but the influence of the horizontal seismic coefficient on the seismic stability of the landfill is strengthened.On the other hand,a certain ratio of the height of the waste mass above the back slope to the depth of waste mass at the back slope,or the reasonable consideration of the magnitude of the amplification factor will be conducive to the seismic design of the landfill.In addition,the results obtained by the pseudo-static and pseudo-dynamic methods were compared. 展开更多
关键词 Seismic stability Expanded landfill Under-berm failure Pseudo-dynamic method Amplification factor
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Determination of the Amplification Factor for 2-Hydroxy-ethylperoxy Radicals in PERCA 认领 引用
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作者 Bin QI Yan MA +1 位作者 Xiao Qian LI Xiao Yan TANG 《Chinese Chemical Letters》 SCIE CAS 2006年第7期957-960,共4页
A new method is proposed to determine the amplification factor for 2-hydroxy ethylperoxy radicals （HOC2H4O2·） in chemical amplifier. The radical source comes from the reaction of excess ethene with HO· rad... A new method is proposed to determine the amplification factor for 2-hydroxy ethylperoxy radicals （HOC2H4O2·） in chemical amplifier. The radical source comes from the reaction of excess ethene with HO· radicals generated in the photolysis of water vapor at the wave length of 185 nm in air in a flow tube. This produces a radical source which contains equal amount of HO2·and HOC2H4O2·. The amplification factor is derived from the slopes of the lines between produced NO2 in chemical amplifier and total initial radical concentrations measured for the source of HO2· and that of the same amount of HO2· and HOC2H4O2· respectively. The amplification factor of HOC2H4O2· was similar to that of HO2·, indicating that HOC2H4O2· can be measured with the same sensitivity as HO2· by chemical amplifier. 展开更多
关键词 2-Hydroxy ethylperoxy radical amplification factor chemical amplification.
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Effects of foundation rocking and uplifting on displacement amplification factor 认领 引用 被引量：6
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作者 Mohammad Khanmohammadi Vahid Mohsenzadeh 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2018年第3期511-525,共15页
Prediction of displacement demand to assess seismic performance of structures is a necessary step where nonlinear static procedures are followed.While such predictions have been well established in literature for fixe... Prediction of displacement demand to assess seismic performance of structures is a necessary step where nonlinear static procedures are followed.While such predictions have been well established in literature for fixed-base structures,fewer bodies of researches have been carried out on the effect of rocking and uplifting of shallow foundations supported by soil,on such prediction.This paper aimed to investigate the effect of soil structure interaction on displacement amplification factor C1 using the beam on nonlinear Winkler foundation concept.A practical range of natural period,force reduction factors,and wide range of anticipated behavior from rocking,uplifting and hinging are considered and using thousands nonlinear time history analysis,displacement amplification factors are evaluated.The results indicate that the suggested equations in current rehabilitation documents underestimate displacement demands in the presence of foundation rocking and uplift.Finally,using regression analyses,new equations are proposed to estimate mean values of C1. 展开更多
关键词 soil-structure interaction rocking and uplifting foundations displacement amplification factor
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Deflection amplification factor for estimating seismic lateral deformations of RC frames 认领 引用 被引量：3
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作者 Maryam Samimifar Asghar Vatani Oskouei Fayaz Rahimzadeh Rofooei 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2015年第2期373-384,共12页
Different values have been assigned to the ratio of the defl ection amplifi cation factor(Cd) to the response modifi cation factor(R) for a specifi ed force-resisting system in the seismic design provisions while the ... Different values have been assigned to the ratio of the defl ection amplifi cation factor(Cd) to the response modifi cation factor(R) for a specifi ed force-resisting system in the seismic design provisions while the same application is defi ned for it. An analytical study of the seismic responses of several reinforced concrete frames subjected to a suite of earthquake records performed in this research indicate that the stories’ overstrength and stiffness distribution along the structural height can affect local defl ections more than global ones. Therefore, the Cd/R ratio is calculated based on the ratio of both maximum inelastic to maximum elastic displacements and interstory drifts. Due to damage concentration in some specifi c stories, the defl ection amplifi cation factor calculated based on inelastic interstory drifts was larger than that of the inelastic displacements. Consequently, a minimum value of 1.0 is recommended for the Cd/R ratio in order to estimate maximum inelastic drifts. The ratio of inelastic to elastic displacement was generally found to increase slightly along the structural height for the studied RC models. In addition, it was detected that the story damage indices of the studied RC frames decrease when the inverted value of inelastic interstory drift ratios are increased through a(negative) power form. 展开更多
关键词 deflection amplification factor nonlinear dynamic
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Dynamic behavior of steel post/wood panel railway noise barriers under aerodynamic loads induced by high-speed trains 认领 引用 被引量：1
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作者 Dongyun Liu Chao Wang +3 位作者 Jaime Gonzalez-Libreros Andréas Andersson Lennart Elfgren Gabriel Sas 《Railway Engineering Science》 EI 2026年第1期55-84,共30页
Railway noise barriers are an essential piece of infrastructure for reducing noise propagation.However,these barriers experience aerodynamic loads generated by high-speed trains,leading to dynamic effects that may com... Railway noise barriers are an essential piece of infrastructure for reducing noise propagation.However,these barriers experience aerodynamic loads generated by high-speed trains,leading to dynamic effects that may compromise their fatigue capacity.The most common structural design for railway noise barriers consists of vertical configurations of posts and panels.However,there have been few dynamic analyses of steel post/wood panel noise barriers under train-induced aerodynamic loads.This study used dynamic finite element analysis to assess the dynamic behavior of such noise barriers.Analysis of a 40-m-long noise barrier model and a triangular simplified load model,the latter of which effectively represented the detailed aerodynamic load,were first used to establish the model and input of the moving load during dynamic simulation.Then,the effects of different parameters on the dynamic response of the noise barrier were evaluated,including the damping ratio,the profile of the steel post,the span length of the panel,the barrier height,and the train speed.Gray relational analysis indicated that barrier height exhibited the highest correlations with the dynamic responses,followed by train speed,post profile,span length,and damping ratio.A reduction in the natural frequency and an increase in the train speed result in a higher peak response and more pronounced fluctuations between the nose and tail waves.The dynamic amplification factor(DAF)was found to be related to both the natural frequency and train speed.A model was proposed showing that the DAF significantly increases as the square of the natural frequency decreases and the cube of the train speed rises. 展开更多
关键词 Aerodynamic load Dynamic amplification factor Dynamic behavior Finite element analysis High-speed train Railway noise barrier
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Vehicle-induced local vibration effects of an orthotropic steel deck considering tire-road contact conditions 认领 引用
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作者 Xu Hua Guo Zengwei +1 位作者 Yao Guowen Feng Ruisheng 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2026年第1期219-236,共18页
This study proposes a multi-scale finite element simulation method to investigate the vehicle-induced local vibration effects of orthotropic steel decks(OSDs)by considering tire-road contact conditions.It also focuses... This study proposes a multi-scale finite element simulation method to investigate the vehicle-induced local vibration effects of orthotropic steel decks(OSDs)by considering tire-road contact conditions.It also focuses on the differences between the dynamic amplification factors(DAFs)of local deflection and strain compared to those corresponding overall response,as well as the influence of road roughness and driving speed on localized DAFs.The results show that vehicle-induced local vibration is distinct near vehicle wheels,especially within 0.5 m from the wheel centerline in the transverse direction and 0.3 m in the longitudinal direction.The localized strain DAFs may potentially exceed 1.4.Generally,the dynamic deflection of a bridge deck is mainly determined by the first system stiffness of OSDs,i.e.,sectional stiffness of the bridge girder.However,the dynamic strain of OSDs arises from the combination of overall bridge modes and local bridge deck panel modes,leading to a higher localized strain DAFs of approximately 16%compared to the overall bridge.Longitudinal and vertical strain DAFs typically occur on U-ribs,while the transverse strain DAFs often arise at stiffness discontinuities of OSD.The recurrent structural variations of OSDs in the transverse and vertical directions result in the maximum vertical strain DAF. 展开更多
关键词 orthotropic steel deck multiscale finite element model vehicle-induced local vibration dynamical amplification factor
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Evaluation approaches for spatial targets localization precision based on observation matrix condition number 认领 引用
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作者 ZHANG Xinyong HE Zhangming +3 位作者 ZHOU Xuanying CHEN Huiyu WANG Jiongqi ZHOU Haiyin 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2026年第2期445-454,共10页
In this paper,we propose evaluation approaches for the spatial target localization precision based on the observation matrix conditional number.Three evaluation approaches for the spatial target localization precision... In this paper,we propose evaluation approaches for the spatial target localization precision based on the observation matrix conditional number.Three evaluation approaches for the spatial target localization precision are derived including relative condition numbers,absolute condition numbers,and volume condition numbers by properties of vectors and matrix norms.The theoretical analysis shows that the proposed methods are the upper certainty bound of the magnification of measurement error.Meanwhile,the proposed methods are able to account for variations of localization accuracy by exploiting geometric variations in the composition between the target and measurement stations.Finally,the proposed methods perform better,compared with the traditional evaluation methods.This is of great significance for the accuracy evaluation of high-precision measuring equipment,optimization of workstation layout and geometric configuration.Simulation experiments corroborate the effectiveness of the proposed methods. 展开更多
关键词 target positioning error amplification factor condition number geometric accuracy factor upper bound
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Research on the design floor response spectrum of buildings by dynamic analysis 认领 引用
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作者 Liu Rongheng Bai Wen +3 位作者 Dai Junwu Shao Zhipeng Jiang Tao Zhao Bingzhang 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2025年第2期413-436,共24页
The seismic design forces of nonstructural components(NSCs)in buildings are closely related to floor acceleration response amplification.To investigate the differences in acceleration responses of structures with diff... The seismic design forces of nonstructural components(NSCs)in buildings are closely related to floor acceleration response amplification.To investigate the differences in acceleration responses of structures with different structural types,fundamental periods,and seismic design levels,56 reinforced concrete and steel structures with fundamental periods ranging from 0.37 s to 5.68 s were selected.For each structure,100 sets of earthquake motions were used as inputs for elastic time history analysis.Based on the resulting 26,500 sets of floor acceleration response data,the amplification rules of peak floor acceleration/peak ground acceleration(PFA/PGA)along the height of various structures and the corresponding floor response spectrum characteristics were studied.The nonlinear changes of PFA/PGA along the height of long period structures were compared with the codes of different countries.Moreover,more suitable prediction equations were proposed based on the structural characteristics.Finally,to solve the issue that existing research still cannot accurately reflect the acceleration amplification coefficient of NSCs with different dynamic characteristics in main structures with different periods,a normalized floor response spectrum is proposed that can simultaneously consider the effects of input ground motion characteristics and the main structure,which can be better used in the seismic design of NSCs. 展开更多
关键词 floor acceleration amplification factor nonstructural components component amplification factor seismic design floor response spectrum
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Amplification Effect of Peak Ground Motion Acceleration in ClassⅡ and Ⅲ Sites over Shandong Province 认领 引用 被引量：1
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作者 Diao Ting Chen Shijun Jiang Zaofeng 《Earthquake Research in China》 2011年第4期498-506,共9页
In this paper, the amplification factor （ks ） of peek ground motion with different exceedance probability in class Ⅱ and Ⅲ sites over Shandong Province was estimated by analyzing the seismic response data of soil ... In this paper, the amplification factor （ks ） of peek ground motion with different exceedance probability in class Ⅱ and Ⅲ sites over Shandong Province was estimated by analyzing the seismic response data of soil layers collected from 358 boreholes of class Ⅱ sites and 140 boreholes of class Ⅲ site. From the results, one can conclude that： （1） The scatter plot of ks generally obeys a normal distribution ; （2） ks decreases with the increase of the strength of input ground motion, which is more apparent in Class Ⅲ site than in class lI site; （3） for class Ⅱ site, with the increase of depth of the bedrock interface where ground motion inputs, ks increases gradually until to a stable value when the depth reaches up to approximately 20 meters or larger. Yet, for class Ⅲ site, ks is insensitive to the depth; （4） the average of ks for class Ⅱ site is 1.47, slightly larger than that used in the Seismic Ground Motion Parameters Zonation Map of China （ GB 18306-2001 ）. Also, ks in class Ⅱ and Ⅲ sites at different levels of peak ground acceleration over Shandong Province is preliminarily discussed in the paper. 展开更多
关键词 Seismic ground motion Peak ground acceleration Site condition Exceedanceprobability amplification factor
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Seismic responses and shattering cumulative effects of bedding parallel stepped rock slope:Model test and numerical simulation 认领 引用 被引量：3
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作者 Chunlei Xin Fei Yang +2 位作者 Wenkai Feng Zhao Wang Wenhui Li 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第4期2009-2030,共22页
Bedding parallel stepped rock slopes exist widely in nature and are used in slope engineering.They are characterized by complex topography and geological structure and are vulnerable to shattering under strong earthqu... Bedding parallel stepped rock slopes exist widely in nature and are used in slope engineering.They are characterized by complex topography and geological structure and are vulnerable to shattering under strong earthquakes.However,no previous studies have assessed the mechanisms underlying seismic failure in rock slopes.In this study,large-scale shaking table tests and numerical simulations were conducted to delineate the seismic failure mechanism in terms of acceleration,displacement,and earth pressure responses combined with shattering failure phenomena.The results reveal that acceleration response mutations usually occur within weak interlayers owing to their inferior performance,and these mutations may transform into potential sliding surfaces,thereby intensifying the nonlinear seismic response characteristics.Cumulative permanent displacements at the internal corners of the berms can induce quasi-rigid displacements at the external corners,leading to greater permanent displacements at the internal corners.Therefore,the internal corners are identified as the most susceptible parts of the slope.In addition,the concept of baseline offset was utilized to explain the mechanism of earth pressure responses,and the result indicates that residual earth pressures at the internal corners play a dominant role in causing deformation or shattering damage.Four evolutionary deformation phases characterize the processes of seismic responses and shattering failure of the bedding parallel stepped rock slope,i.e.the formation of tensile cracks at the internal corners of the berm,expansion of tensile cracks and bedding surface dislocation,development of vertical tensile cracks at the rear edge,and rock mass slipping leading to slope instability.Overall,this study provides a scientific basis for the seismic design of engineering slopes and offers valuable insights for further studies on preventing seismic disasters in bedding parallel stepped rock slopes. 展开更多
关键词 Rock slope stability Shaking table test Numerical simulation Permanent displacement Acceleration amplification factor
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Transverse vibration characteristics and influence of passenger car window glass in high-speed train passing through tunnel 认领 引用 被引量：1
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作者 Xiaogen Liu Qi Shuang +1 位作者 Zhide Wang Detian Wan 《Railway Sciences》 2025年第4期450-463,共14页
Purpose–This paper aims to analyze the transverse vibration characteristics of the high speed train window glass when passing through tunnel.Design/methodology/approach–The lateral vibration acceleration response of... Purpose–This paper aims to analyze the transverse vibration characteristics of the high speed train window glass when passing through tunnel.Design/methodology/approach–The lateral vibration acceleration response of glass chamber of high-speed train CR400BF-A on Beijing-Chengdu high-speed railway was tested at different speeds through the tunnel entrance,exit,tunnel interior,Tunnel Group and rendezvous time in the tunnel,the lateral distribution characteristics of vibration frequency and vibration power amplification coefficient of glass of high-speed train were analyzed.Findings–The results show that:The vibration of the high-speed train glass increases significantly during the tunnel,and the amplitude of vibration acceleration in the tunnel is significantly higher than outside the tunnel as the travel speed increases;the amplitude of lateral vibration acceleration of the glass of a high-speed train does not vary with changes in tunnel length and is not affected by the aerodynamic effects of the tunnel when traveling inside the tunnel,but its vibrations create noticeable fluctuations during variations when encountering oncoming traffic;The vibration characteristics of the high-speed train glass are forced harmonic vibrations,the excitation frequency does not vary with travel speed and travel position changes inside and outside the tunnel.The lateral vibration acceleration of the glass of a high-speed train is applied vertically and uniformly to the glass surface as an“inertial force”and creates a cyclic bending vibration stress that can easily lead to fatigue damage.Originality/value–The research results provide guidance for the prevention of glass failure in high-speed trains. 展开更多
关键词 High-speed train glass Crossing tunnel Vibration acceleration amplitude Vibration frequency Dynamic amplification factor
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Therapeutic strategies targeting the epidermal growth factor receptor signaling pathway in metastatic colorectal cancer 认领 引用
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作者 Yi Zhou Shuang Wu Fan-Jie Qu 《World Journal of Gastrointestinal Oncology》 SCIE 2024年第6期2362-2379,共18页
More than 1.9 million new colorectal cancer(CRC)cases and 935000 deaths were estimated to occur worldwide in 2020,representing about one in ten cancer cases and deaths.Overall,colorectal ranks third in incidence,but s... More than 1.9 million new colorectal cancer(CRC)cases and 935000 deaths were estimated to occur worldwide in 2020,representing about one in ten cancer cases and deaths.Overall,colorectal ranks third in incidence,but second in mortality.More than half of the patients are in advanced stages at diagnosis.Treatment options are complex because of the heterogeneity of the patient population,including different molecular subtypes.Treatments have included conventional fluorouracil-based chemotherapy,targeted therapy,immunotherapy,etc.In recent years,with the development of genetic testing technology,more and more targeted drugs have been applied to the treatment of CRC,which has further prolonged the survival of metastatic CRC patients. 展开更多
关键词 Metastatic colorectal cancer Epidermal growth factor receptor B-type RAF mutation Kirsten rat sarcoma viral oncogene wild type Kirsten rat sarcoma viral oncogene G12C mutation Human epidermal growth factor receptor 2 overexpression/amplification
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Minimum Number of Load Increments in Second-Order Elastic Analyses of Steel Frames 认领 引用
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作者 Nadine Faramawi Barry T.Rosson 《Journal of Civil Engineering and Architecture》 2025年第11期523-527,共5页
A relationship was discovered between the amplification factor and the number of load increments that are needed to limit the relative error to one percent in second-order elastic analyses with a predictor-corrector s... A relationship was discovered between the amplification factor and the number of load increments that are needed to limit the relative error to one percent in second-order elastic analyses with a predictor-corrector solution scheme.Previous research by the authors proposed a design equation to determine the required minimum number of load increments based on an evaluation of the elastic critical buckling load ratio.Further research has shown that an approximate amplification factor equation that is based on the B2 multiplier equation produces similar results when the amplification factor is less than approximately four.Eleven moment frames are used to verify the use of the new approximate amplification factor in the proposed design equation. 展开更多
关键词 Nonlinear geometric analysis amplification factor load increment structural frame
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Establishment of Constitutive Model of Silicone Rubber Foams Based on Statistical Theory of Rubber Elasticity 认领 引用 被引量：7
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作者 Cheng-Sha Wei Ai Lu +3 位作者 Su-Ming Sun Xing-Wen Wei Xiao-Yu Zhou Jie Sun 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2018年第9期1077-1083,共7页
In this study, a constitutive model based on microscopic physical mechanism of silicone rubber foams was established. A theoretical statistical model of rubber elasticity considering the effect of dangling chains was ... In this study, a constitutive model based on microscopic physical mechanism of silicone rubber foams was established. A theoretical statistical model of rubber elasticity considering the effect of dangling chains was modified to build this model. When a strain amplification factor （X） was introduced, the theoretical model could fit the tensile stress-strain data of mono- and bi-modal foam matrix well （Adj. R-Square = 0.9989, 0.9983）. Parameters related to the polymer network, namely, average molecular weight （Me） and volume fraction （Ф） of chain segments between adjacent cross-linking points （network strands）, were calculated by probabilistic method from the number-average molecular weight （Mn）, vinyl content （wvi） of the primary polysiloxanes and percent conversion （q） of vinyl groups. The primary and infinite strain amplification factors （X0, X∞） and decay exponent （z）, introduced by X and related to the nanoparticles, were obtained by fitting. Inspired by the fact that the actual strain of matrix was lower than that of the foams＇, we introduced another item, strain hysteresis item （H, related with the foam porosity and cell structure）, into the statistical model as well. With the same above values of Mc, Ф, X0 and X∞, the model could also fit the compressive stress-strain data of mono- and bi-modal foams well （Adj. R-Square = 0.9948, 0.9985）. Interestingly, the strain hysteresis items of the mono- and bi-modal foams almost completely coincided under all experimental strains, which may be attributed to the almost equal porosity and similar cell structure of the two foams. This constitutive model may connect the macroscopic stress-strain behaviour to the parameters of microscopic molecular structures, promisingly providing a basis for the performance improvement and optimization of silicone rubber foams. 展开更多
关键词 Silicone rubber foams Constitutive model Statistical theory of rubber elasticity Strain amplification factor Strain hysteresis item
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Seismic force demands on acceleration-sensitive nonstructural components:a state-of-the-art review 认领 引用 被引量：11
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作者 Wang Tao Shang Qingxue Li Jichao 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2021年第1期39-62,共24页
Nonstructural components(NSCs)are parts,elements,and subsystems that are not part of the primary loadbearing system of building structures but are subject to seismic loading.Damage to NSCs may disrupt the functionalit... Nonstructural components(NSCs)are parts,elements,and subsystems that are not part of the primary loadbearing system of building structures but are subject to seismic loading.Damage to NSCs may disrupt the functionality of buildings and result in significant economic losses,injuries,and casualties.In past decades,extensive studies have been conducted on the seismic performance and seismic design methods of NSCs.As the input for the seismic design of NSCs,floor response spectra(FRS)have attracted the attention of researchers worldwide.This paper presents a state-of-the-art review of FRS.Different methods for generating FRS are summarized and compared with those in current seismic design codes.A detailed review of the parameters influencing the FRS is presented.These parameters include the characteristics of ground motion excitation,supporting building and NSCs.The floor acceleration response and the FRS obtained from experimental studies and field observations during earthquakes are also discussed.Three RC frames are used in a case study to compare the peak floor acceleration(PFA)and FRS calculated from time history analyses(THA)with that generated using current seismic design codes and different methods in the literature.Major knowledge gaps are identified,including uncertainties associated with developing FRS,FRS generation methods for different types of buildings,the need for comprehensive studies on absolute acceleration,relative velocity,and relative displacement FRS,and the calibration of FRS by field observations during earthquakes. 展开更多
关键词 nonstructural components peak floor acceleration floor response spectra component amplification factor
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Seismic performance evaluation of water supply pipes installed in a full-scale RC frame structure based on a shaking table test 认领 引用 被引量：3
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作者 Wu Houli Guo Endong +2 位作者 Wang Jingyi Dai Xin Dai Chenxi 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2024年第1期163-178,共16页
As an important part of nonstructural components,the seismic response of indoor water supply pipes deserves much attention.This paper presents shaking table test research on water supply pipes installed in a full-scal... As an important part of nonstructural components,the seismic response of indoor water supply pipes deserves much attention.This paper presents shaking table test research on water supply pipes installed in a full-scale reinforced concrete(RC)frame structure.Different material pipes and different methods for penetrating the reinforced concrete floors are combined to evaluate the difference in seismic performance.Floor response spectra and pipe acceleration amplification factors based on test data are discussed and compared with code provisions.A seismic fragility study of displacement demand is conducted based on numerical simulation.The acceleration response and displacement response of different combinations are compared.The results show that the combination of different pipe materials and different passing-through methods can cause obvious differences in the seismic response of indoor riser pipes. 展开更多
关键词 water supply pipe different materials shaking table test amplification factor seismic fragility
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Boundary Element Modeling of Multiconnected Ocean Basin in Visakhapatnam Port Under the Resonance Conditions 认领 引用 被引量：2
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作者 Prashant KUMAR Prachi PRIYA RAJNI 《China Ocean Engineering》 SCIE EI CSCD 2021年第5期662-675,共14页
A mathematical model has been developed to analyze the influence of extreme water waves over multiconnected regions in Visakhapatnam Port,India by considering an average water depth in each multiconnected regions.In a... A mathematical model has been developed to analyze the influence of extreme water waves over multiconnected regions in Visakhapatnam Port,India by considering an average water depth in each multiconnected regions.In addition,partial reflection of incident waves on coastal boundary is also considered.The domain of interest is divided mainly into two regions,i.e.,open sea region and harbor region namely as Region-I and Region-II,respectively.Further,Region-II is divided into multiple connected regions.The 2-D boundary element method(BEM)including the Chebyshev point discretization is utilized to solve the Helmholtz equation in each region separately to determine the wave amplification.The numerical convergence is performed to obtain the optimum numerical accuracy and the validation of the current numerical approach is also conducted by comparing the simulation results with existing studies.The four key spots based on the moored ship locations in Visakhapatnam Port are identified to perform the numerical simulation.The wave amplification at these locations is estimated for monochromatic incident waves,considering approximate water depth and different reflection coefficients on the wall of port under the resonance conditions.In addition,wave field analysis inside the Visakhapatnam Port is also conducted to understand resonance conditions.The current numerical model provides an efficient tool to analyze the amplification on any realistic ports or harbors. 展开更多
关键词 boundary element method amplification factor Helmholtz equation reflection coefficient Visakhapatnam Port
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Dynamic Analysis Method of Offshore Jack-up Platforms in Regular and Random Waves 认领 引用 被引量：8
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作者 Hao Yu Xiaoyu Li Shuguang Yang 《Journal of Marine Science and Application》 2012年第1期111-118,共8页
A jack-up platform, with its particular structure, showed obvious dynamic characteristics under complex environmental loads in extreme conditions. In this paper, taking a simplified 3-D finite element dynamic model in... A jack-up platform, with its particular structure, showed obvious dynamic characteristics under complex environmental loads in extreme conditions. In this paper, taking a simplified 3-D finite element dynamic model in extreme storm conditions as research object, a transient dynamic analysis method was proposed, which was under both regular and irregular wave loads. The steps of dynamic analysis under extreme conditions were illustrated with an applied case, and the dynamic amplification factor （DAF） was calculated for each response parameter of base shear, overturning moment and hull sway. Finally, the structural response results of dynamic and static were compared and analyzed. The results indicated that the static strength analysis of the Jack-up Platforms was not enough under the dynamic loads including wave and current, further dynamic response analysis considering both computational efficiency and accuracy was necessary. 展开更多
关键词 jack-up platforms wave loads dynamic analysis dynamic amplification factor
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Dynamic behaviors of pretensioned cable AERORail structure 认领 引用 被引量：1
20
作者 李方元 吴培峰 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第6期2267-2276,共10页
The AERORail, a new aerial transport platform, was chosen as the object of this work. Following a review of the literature on static behaviors, model tests on the basic dynamic mechanical characteristics were conducte... The AERORail, a new aerial transport platform, was chosen as the object of this work. Following a review of the literature on static behaviors, model tests on the basic dynamic mechanical characteristics were conducted. A series of 90 tests were completed with different factors, including tension force, vehicle load and vehicle speed. With regard to the proper tension and vehicle load, at a certain speed range, the tension increments of the rail's cable were proved relatively small. It can be assumed that the change of tension is small and can be reasonably ignored when the tension of an entire span is under a dynamic load. When the tension reaches a certain range, the calculation of the cable track structure using classical cable theory is acceptable. The tests prove that the average maximum dynamic amplification factor of the deflection is small, generally no more than 1.2. However, when the vehicle speed reaches a certain value, the amplified factor will reach 2.0. If the moving loads increase, the dynamic amplification factor of dynamic deflection will also increase. The tension will change the rigidity of the structure and the vibration frequency; furthermore, the resonance speed will change at a certain tension. The vibration is noticeable when vehicles pass through at the resonance speed, and this negative impact on driving comfort requires the right velocity to avoid the resonance. The results demonstrate that more design details are required for the AERORail structure. 展开更多
关键词 pretensioned cable AERORail structure dynamic bchavior model test vibration characteristic dynamic amplification factor influence line
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