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Research on controlling long-term performance by tensioning post tendon of long-span continuous rigid-frame bridges 认领 引用 被引量：1
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作者 HE Mingxuan ZHENG Yifeng ZHAO Qun 《Global Geology》 2013年第4期213-216,共4页
The problems like cracking of the girder in the mid-span and the ever-increasing vertical deflection appear during the long term usage of the long-span continuous rigid-flame bridge. Post-tension tendon with re- serve... The problems like cracking of the girder in the mid-span and the ever-increasing vertical deflection appear during the long term usage of the long-span continuous rigid-flame bridge. Post-tension tendon with re- served duct can increase the pre-stress of the main beam effectively, and decrease the long term span deflection in order to improve the performance of the girder. At the same time, the proper tension position is very crucial to optimise the stress distribution of the bridge and control the deflection increase. Combining with practical en- gineering, the authors analyze the influence of different positions of post-tension tendon （ including top-, web- and bottom plate tendons） on the stress and deflection of the main beam, and find out the optimal position of post tendon. 展开更多
关键词 continuous rigid-frame bridge long term performance post tendon optimal tension position
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Design and Construction Strategy of Arched Continuous Rigid-frame Bridge 认领 引用
2
作者 Yueqi Gao 《Journal of World Architecture》 2021年第1期5-7,共3页
With the current rapid development of urbanization in China,people's living standards have been greatly improved.In the context of such a development background,the requirements for road traffic are getting more s... With the current rapid development of urbanization in China,people's living standards have been greatly improved.In the context of such a development background,the requirements for road traffic are getting more stringent,especially for bridge projects.The arched continuous rigid-frame bridge was developed under this social background.The advantage of the bridge lies in the design of a bridge model that integrates various functions such as transportation,landscape,and sightseeing.Based on the above,this paper first refers to the case to analyze the design and construction strategy of the arched continuous rigid-frame bridge,in hope of providing a valuable reference for relevant personnel. 展开更多
关键词 Arch Continuous steel structure Bridge design Construction
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Effect of concrete creep on pre-camber of continuous rigid-frame bridge 认领 引用
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作者 贺国京 李媛媛 +1 位作者 邹中权 段靓靓 《Journal of Central South University》 SCIE EI CAS 2008年第S1期337-341,共5页
The effect of concrete creep on the pre-camber of a long-span pre-stressed concrete continuous rigid-frame bridge constructed by cantilever casting method was investigated.The difference of creep coefficients calculat... The effect of concrete creep on the pre-camber of a long-span pre-stressed concrete continuous rigid-frame bridge constructed by cantilever casting method was investigated.The difference of creep coefficients calculated with two Chinese codes was discussed.Based on the calculations,the pre-camber of a pre-stressed concrete continuous rigid-frame box bridge was computed for construction control purpose.The results show that the short-term creep coefficient and long-term creep coefficient calculated with the CC-1985 are larger than those calculated with the CC-2004,while the medium-term creep coefficient calculated with the CC-1985 is smaller than that calculated with the CC-2004.The difference of creep deformation calculated with these two codes is small,and the influences of concrete creep on the pre-camber for most of the segments are negligible.The deflections and stresses of the box girder measured during the construction stages agree very well with the predictions. 展开更多
关键词 creep pre-stressed concrete continuous rigid-frame bridge cantilever casting method pre-camber
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Study on Seismic Performance of Continuous T-Beam Bridge—Kulungou Bridge 认领 引用
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作者 Jiuqing Zhou Daming Lin +2 位作者 Leifa Li Guanghui Zhang Shumao Qiu 《Structural Durability & Health Monitoring》 EI 2025年第3期705-729,共25页
The objective of this research is to assess the seismic behavior of the continuous T-beam bridge located at Kulungou in Xinjiang.In addition to traditional static and modal analyses,this study introduces a novel appro... The objective of this research is to assess the seismic behavior of the continuous T-beam bridge located at Kulungou in Xinjiang.In addition to traditional static and modal analyses,this study introduces a novel approach by comprehensively examining the performance of the bridge during construction stages,under ultimate load capacities and seismic load.Compliance with regulatory standards is verified by the static analysis,which also yields a thorough comprehension of stress distribution across various stages of construction.By unveiling the initial 100 vibration modes,the modal analysis has significantly enhanced our comprehension and established a robust basis for the ensuing seismic analysis.A distinctive aspect of this research is its comprehensive exploration of the bridge’s seismic behavior under E1 and E2 earthquake excitations.Under E1 earthquake excitation,the response spectrum analysis confirms the adequacy of the bridge piers’strength according to seismic design criteria,whereas the time-history analysis conducted under E2 ground motion reveals the bridge’s robust resistance to strong earthquakes.This study also undertakes a comparative assessment of the seismic behavior of the bridge,contrasting its performance with lead-rubber bearings against that with high-damping rubber bearings.According to the study’s findings,both types of bearings demonstrate their efficacy in mitigating seismic responses,thereby emphasizing their potential as innovative approaches to enhance the resilience of bridges.A notable contribution of this research lies in its assessment of seismic performance indicators,namely hysteresis curves,backbone curves,and ductility coefficients,utilizing Pushover analysis.By conducting a thorough evaluation,a more profound insight into the seismic performance of bridge piers is gained.In conclusion,the study explores how earthquake wave intensity and aftershocks affect the seismic response of bridge piers,showing a substantial increase in seismic response with intensifying wave magnitude and the potential for aftershocks to aggravate damage to compromised structures.The importance of incorporating these factors in the seismic design and retrofitting of bridges is underscored by these discoveries.This study,in its entirety,proposes a fresh and comprehensive methodology to assess the seismic performance of continuous T-beam bridges,furnishing valuable perspectives and innovative remedies to augment the seismic resilience of bridges in earthquake-prone zones. 展开更多
关键词 Continuous T-beam bridge seismic performance finite element model earthquake response analysis
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Longitudinal force in continuously welded rail on long-span tied arch continuous bridge carrying multiple tracks 认领 引用 被引量：23
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作者 闫斌 戴公连 +1 位作者 郭文华 徐庆元 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第5期2001-2006,共6页
Considering arch rib, lateral brace, suspender, girder, pier and track position, the model for the interaction between long-span tied arch continuous bridge and multiple tracks was established by using steel-concrete ... Considering arch rib, lateral brace, suspender, girder, pier and track position, the model for the interaction between long-span tied arch continuous bridge and multiple tracks was established by using steel-concrete composite section beam element to simulate concrete-filled steel tube(CFST) arch rib, using the beam element with rigid arm to simulate the prestressed concrete girder and using nonlinear bar element to simulate longitudinal constraint between track and bridge. Taking a(77+3×156.8+77) m tied arch continuous bridge with four tracks on the Harbin-Qiqihar Passenger Dedicated Line as an example, the arrangement of continuously welded rail(CWR) was explored. The longitudinal force in CWR on the tied arch continuous bridge, the pier top horizontal force and torque due to the unbalance load case, were analyzed under the action of temperature, vertical live load, train braking and wind load.Studies show that, it can significantly reduce track displacement to set the track expansion devices at main span arch springing on both sides; the track stress due to arch temperature variation can reach 40.8 MPa; the track stress, pier top horizontal force and torque are related to the number of loaded tracks and train running direction, and the bending force applied to unloaded track is close to the loaded track, while the braking force applied to unloaded track is 1/4 to 1/2 of the loaded track; the longitudinal force of track due to the wind load is up to 12.4 MPa, which should be considered. 展开更多
关键词 railroad bridge long-span bridge tied arch continuous beam continuously welded rail track-bridge interaction
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Study of the seismic performance of expansion double spherical seismic isolation bearings for continuous girder bridges 认领 引用 被引量：12
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作者 Peng, Tianbo Yu, Xuntao +1 位作者 Wang, Zhennan Han, Lei 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2012年第2期163-172,共10页
The development of an expansion double spherical seismic isolation (DSSI) bearing by modifying the fixed DSSI bearing is described in this paper. The expansion DSSI bearing is characterized by its good energy dissipat... The development of an expansion double spherical seismic isolation (DSSI) bearing by modifying the fixed DSSI bearing is described in this paper. The expansion DSSI bearing is characterized by its good energy dissipation and horizontal displacement capacity and has been successfully integrated into the seismic design of several important engineering projects in China. It is envisioned to be used as a substitute for ordinary expansion bearings in continuous girder bridges to distribute the longitudinal earthquake action among all the piers. Its development, configuration and working mechanism are introduced first. The test method and the seismic performance of an expansion DSSI bearing are then briefly described. A theoretical analysis followed by a numerical analysis for an actual four-span continuous girder bridge are provided as an example, and it is concluded that the expansion DSSI bearing can be integrated into the seismic design of continuous girder bridges. 展开更多
关键词 double spherical seismic isolation (DSSI) bearing seismic isolation seismic performance continuous girder bridge
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Dynamic finite element model updating of prestressed concrete continuous box-girder bridge 认领 引用 被引量：6
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作者 Lin Xiankun Zhang Lingmi +1 位作者 Guo Qintao Zhang Yufeng 《Earthquake Engineering and Engineering Vibration》 SCIE EI 2009年第3期399-407,共9页
The dynamic finite element model （FEM） of a prestressed concrete continuous box-girder bridge, called the Tongyang Canal Bridge, is built and updated based on the results of ambient vibration testing （AVT） using a... The dynamic finite element model （FEM） of a prestressed concrete continuous box-girder bridge, called the Tongyang Canal Bridge, is built and updated based on the results of ambient vibration testing （AVT） using a real-coded accelerating genetic algorithm （RAGA）. The objective functions are defined based on natural frequency and modal assurance criterion （MAC） metrics to evaluate the updated FEM. Two objective functions are defined to fully account for the relative errors and standard deviations of the natural frequencies and MAC between the AVT results and the updated FEM predictions. The dynamically updated FEM of the bridge can better represent its structural dynamics and serve as a baseline in long-term health monitoring, condition assessment and damage identification over the service life of the bridge . 展开更多
关键词 prestressed concrete continuous box-girder bridge field ambient vibration testing dynamic characteristics model updating accelerating genetic algorithm objective function
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Longitudinal forces of continuously welded track on high-speed railway cable-stayed bridge considering impact of adjacent bridges 认领 引用 被引量：35
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作者 戴公连 闫斌 《Journal of Central South University》 SCIE EI CAS 2012年第8期2348-2353,共6页
A proven beam-track contact model was used to analyze the track-structure interaction of CWR (continuously welded track) on bridge. Considering the impact of adjacent bridges, the tower-cable-track-beam-pier-pile fini... A proven beam-track contact model was used to analyze the track-structure interaction of CWR (continuously welded track) on bridge. Considering the impact of adjacent bridges, the tower-cable-track-beam-pier-pile finite element model of the cable-stayed bridge was established. Taking a bridge group including 40-32m simply-supported beam and (32+80+112)m single-tower cable-stayed bridge and 17-32m simply-supported beam on the Kunming-Shanghai high-speed railway as an example, the characteristics of CWR longitudinal force on the cable-stayed bridge were studied. It is shown that adjacent bridges must be considered in the calculation of the track expansion force and bending force on cable-stayed bridge. When the span amount of adjacent bridges is too numerous, it can be simplified as six spans; the fixed bearing of adjacent simply-supported beams should be placed on the side near the cable-stayed bridge; the track expansion device should be set at the bridge tower to reduce the track force near the bridge abutment. 展开更多
关键词 high-speed railway continuously welded track cable-stayed bridge simply-supported beam
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Refined analysis and construction parameter calculation for full-span erection of the continuous steel box girder bridge with long cantilevers 认领 引用 被引量：8
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作者 Jin-feng WANG Tian-mei WU +2 位作者 Jiang-tao ZHANG Hua-wei XIANG Rong-qiao XU 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2020年第4期268-279,共12页
To accurately control the full-span erection of continuous steel box girder bridges with complex cross-sections and long cantilevers, both the augmented finite element method(A-FEM) and the degenerated plate elements ... To accurately control the full-span erection of continuous steel box girder bridges with complex cross-sections and long cantilevers, both the augmented finite element method(A-FEM) and the degenerated plate elements are adopted in this paper. The entire construction process is simulated by the A-FEM with the mesh-separation-based approximation technique, while the degenerated plate elements are constructed based on 3D isoparametric elements, making it suitable for analysis of a thin-walled structure. This method significantly improves computational efficiency by avoiding numerous degrees of freedom(DoFs) when analyzing complex structures. With characteristics of the full-span erection technology, the end-face angle of adjacent girder segments, the preset distance of girder segments from the design position, and the temperature difference are selected as control parameters, and they are calculated through the structural response of each construction stage. Engineering practice shows that the calculation accuracy of A-FEM is verified by field-measured results. It can be applied rapidly and effectively to evaluate the matching state of girder segments and the stress state of bearings as well as the thermal effect during full-span erection. 展开更多
关键词 Continuous steel box girder bridges Full-span erection Augmented finite element method(A-FEM) Construction control Construction parameter calculation
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Mechanics model of additional longitudinal force transmission between bridges and continuously welded rails with small resistance fasteners 认领 引用 被引量：11
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作者 徐庆元 周小林 +1 位作者 曾志平 杨小礼 《Journal of Central South University of Technology》 2004年第3期336-339,共4页
A new mechanics model, which reveals additional longitudinal force transmission between the continuously welded rails and the bridges, is established on the fact that the influence of the mutual relative displacement ... A new mechanics model, which reveals additional longitudinal force transmission between the continuously welded rails and the bridges, is established on the fact that the influence of the mutual relative displacement (among) the rail, the sleeper and the beam is taken into account. An example is presented and numerical results are compared. The results show that the additional longitudinal forces calculated with the new model are less than those of the previous, especially in the case of the flexible pier bridges. The new model is also suitable for the analysis of the additional longitudinal force transmission between rails and bridges of ballastless track with small resistance fasteners without taking the sleeper displacement into account, and compared with the ballast bridges, the ballastless bridges have a much stronger additional longitudinal force transmission between the continuously welded rails and the bridges. 展开更多
关键词 railway engineering continuously welded rails on bridge additional longitudinal force mechanics model
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Impact coefficient and reliability of mid-span continuous beam bridge under action of extra heavy vehicle with low speed 认领 引用 被引量：15
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作者 刘波 王有志 +1 位作者 胡朋 袁泉 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第4期1510-1520,共11页
To analyze the dynamic response and reliability of a continuous beam bridge under the action of an extra heavy vehicle, a vehicle–bridge coupled vibration model was established based on the virtual work principle and... To analyze the dynamic response and reliability of a continuous beam bridge under the action of an extra heavy vehicle, a vehicle–bridge coupled vibration model was established based on the virtual work principle and vehicle–bridge displacement compatibility equation, which can accurately simulate the dynamic characteristics of the vehicle and bridge. Results show that deck roughness has an important function in the effect of the vehicle on the bridge. When an extra heavy vehicle passes through the continuous beam bridge at a low speed of 5 km/h, the impact coefficient reaches a high value, which should not be disregarded in bridge safety assessments. Considering that no specific law exists between the impact coefficient and vehicle speed, vehicle speed should not be unduly limited and deck roughness repairing should be paid considerable attention. Deck roughness has a significant influence on the reliability index, which decreases as deck roughness increases. For the continuous beam bridge in this work, the reliability index of each control section is greater than the minimum reliability index. No reinforcement measures are required for over-sized transport. 展开更多
关键词 continuous beam bridge extra heavy vehicle coupled vibration impact coefficient reliability
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Mechanical deformation properties of Continuous Welded Rail on kilometer-span suspension bridge for high-speed railway 认领 引用 被引量：5
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作者 Xiaopei Cai Wanli Liu +2 位作者 Liang Gao Yonghua Su Jingfan Yang 《High-Speed Railway》 2023年第2期97-109,共13页
The complex bridge-track interaction between kilometer-span bridges and continuous Welded Rail(CWR)brings great challenges to CWR designing.Taking a suspension bridge with laying CWR as a case,the mechanical propertie... The complex bridge-track interaction between kilometer-span bridges and continuous Welded Rail(CWR)brings great challenges to CWR designing.Taking a suspension bridge with laying CWR as a case,the mechanical properties of CWR on the bridge are analyzed to reveal the sensitive areas of the track,and the design method of CWR and track structures on the beam ends are proposed.The results show that the unidirectional Rail Expansion Joints(REJ)need to be installed on the beam end of the kilometer-span bridge to reduce rail longitudinal force.Due to the bridge characteristics,there is no CWR fixed area on the kilometer-span bridge,and rail longitudinal force on the main span caused by bending loads needs to be concerned.The deformation of track on the beam end is complex,which is the weak area on the kilometer bridge,the large relative displacement between the stock rail of REJ and the main beam can cause poor stability of ballast bed on beam end,small resistance fasteners need to be laid on the sides of stock rail on the main beam to increase the stability of ballast and fasteners on the beam end.To improve the driving safety and comfort of beam end,the Sleeper-Supporting Apparatus(SSA)should be specially designed to ensure the uniform transition of track on beam ends.Temperature and wind loads have a significant impact on track regularity on the kilometer span bridge,the dynamic response of trains and bridges under those loads needs to be attended to. 展开更多
关键词 Kilometer-span suspension bridge Continuous welded rail Rail expansion joint Statics mechanical properties Sleeper-supporting apparatus Dynamic response
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Numerical Simulation for Progressive Collapse of Continuous Girder Bridge Subjected to Ship Impact 认领 引用 被引量：4
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作者 田力 黄飞 《Transactions of Tianjin University》 EI CAS 2014年第4期250-256,共7页
The three-stage simulation method based on LS-DYNA was introduced in this study to simulate the progressive collapse of a continuous girder bridge after a ship-bridge collision. The pile-soil dynamic interaction and t... The three-stage simulation method based on LS-DYNA was introduced in this study to simulate the progressive collapse of a continuous girder bridge after a ship-bridge collision. The pile-soil dynamic interaction and the initial stress and deformation of the whole bridge before the collision were considered. By analyzing the damage, deformation, stress distribution and collapse process of the whole bridge, the results show that the displacement response of the cap beam lags behind the pile cap. The response order of the whole bridge's components depends on their distances from the collision region. The plastic deformation of soil around piles has a positive effect on delaying the further increase in the displacement of piles. The impacted pier's losing stability and its superstructure's excessive deformation are the main reasons leading to the progressive collapse of the continuous girder bridge. 展开更多
关键词 numerical simulation progressive collapse ship-bridge collision continuous girder bridge pile-soil interaction
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Degradation process assessment of prestressed concrete continuous bridges in life-cycle 认领 引用 被引量：1
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作者 田浩 李国平 陈艾荣 《Journal of Central South University》 SCIE EI CAS 2012年第5期1411-1418,共8页
To accurately evaluate the degradation process of prestressed concrete continuous bridges exposed to aggressive environments in life-cycle,a finite element-based approach with respect to the lifetime performance asses... To accurately evaluate the degradation process of prestressed concrete continuous bridges exposed to aggressive environments in life-cycle,a finite element-based approach with respect to the lifetime performance assessment of concrete bridges was proposed.The existing assessment methods were firstly introduced and compared.Some essential mechanics problems involved in the degradation process,such as the deterioration of materials properties,the reduction of sectional areas and the variation of overall structural performance caused by the first two problems,were investigated and solved.A computer program named CBDAS(Concrete Bridge Durability Analysis System) was written to perform the above-metioned approach.Finally,the degradation process of a prestressed concrete continuous bridge under chloride penetration was discussed.The results show that the concrete normal stress for serviceability limit state exceeds the threshold value after 60 a,but the various performance indicators at ultimate limit state are consistently in the allowable level during service life.Therefore,in the case of prestressed concrete bridges,the serviceability limit state is more possible to have durability problems in life-cycle;however,the performance indicators at ultimate limit state can satisfy the requirements. 展开更多
关键词 prestressed concrete continuous bridges life-cycle degradation process finite element chloride penetration serviceability limit state ultimate limit state
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Topographic effects on seismic response of long-span rigid-frame bridge under SV seismic wave 认领 引用 被引量：1
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作者 王蕾 赵成刚 屈铁军 《Acta Seismologica Sinica(English Edition)》 2008年第3期311-318,333,共8页
Seismic ground motions of two neighboring mountains and the free surface between them are calculated under the SV seismic waves with three different incident angles. The results are then taken as the inputs of multi-p... Seismic ground motions of two neighboring mountains and the free surface between them are calculated under the SV seismic waves with three different incident angles. The results are then taken as the inputs of multi-point seismic excitations for the foundation of a long-span bridge built over the valley in the analysis considering the integrated influence of traveling wave and topography. On the basis of a dynamic analytical method, a finite element model is created for the seismic responses of a four-span rigid-frame bridge of 440 m. The pier-top displacement and the pier-bottom internal force of the bridge are calculated. Then the results are compared with those considering traveling-wave effect only. The conclusions can serve as a seismic design reference for the structures located on the complex mountain topography. 展开更多
关键词 traveling-wave effect topographic effect multi-point excitation rigid-frame bridge seismic response
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Auto-parametric resonance of a continuous-beam-bridge model under two-point periodic excitation:an experimental investigation and stability analysis 认领 引用
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作者 Li Yuchun Shen Chao +1 位作者 Liu Wei Li Dong 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2024年第2期445-454,共10页
The auto-parametric resonance of a continuous-beam bridge model subjected to a two-point periodic excitation is experimentally and numerically investigated in this study.An auto-parametric resonance experiment of the ... The auto-parametric resonance of a continuous-beam bridge model subjected to a two-point periodic excitation is experimentally and numerically investigated in this study.An auto-parametric resonance experiment of the test model is conducted to observe and measure the auto-parametric resonance of a continuous beam under a two-point excitation on columns.The parametric vibration equation is established for the test model using the finite-element method.The auto-parametric resonance stability of the structure is analyzed by using Newmark's method and the energy-growth exponent method.The effects of the phase difference of the two-point excitation on the stability boundaries of auto-parametric resonance are studied for the test model.Compared with the experiment,the numerical instability predictions of auto-parametric resonance are consistent with the test phenomena,and the numerical stability boundaries of auto-parametric resonance agree with the experimental ones.For a continuous beam bridge,when the ratio of multipoint excitation frequency(applied to the columns)to natural frequency of the continuous girder is approximately equal to 2,the continuous beam may undergo a strong auto-parametric resonance.Combined with the present experiment and analysis,a hypothesis of Volgograd Bridge's serpentine vibration is discussed. 展开更多
关键词 auto-parametric resonance continuous beam bridge model two-point excitation experimental investigation stability analysis vibration of Volgograd Bridge
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Mechanical response of continuously reinforced concrete pavement on foam concrete interlayer for two-way curved arch bridge 认领 引用
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作者 Chen Xiaobing Xu Libin +1 位作者 Liu Han He Chusheng 《Journal of Southeast University(English Edition)》 EI CAS 2018年第3期349-355,共7页
In order to research the mechanical response of continuously reinforced concrete pavement on foam concrete interlayer for a two-way curved arch bridge, the elliptical vehicle load is translated into the rectangular lo... In order to research the mechanical response of continuously reinforced concrete pavement on foam concrete interlayer for a two-way curved arch bridge, the elliptical vehicle load is translated into the rectangular load based on the equivalence method. Then, a three-dimensional finite element model of the whole bridge is established. The reliability of the model is verified. Additionally, the mechanical response of continuously reinforced concrete pavement under vehicle loading is analyzed. Finally, the most unfavorable loading conditions of tensile stress, shear stress and vertical displacement are determined. The results show that the most unfavorable loading condition of tensile stress, which is at the bottom of continuously reinforced concrete pavement on the two-way curved arch bridge, is changed compared with that on homogeneous foundation. The most unfavorable loading condition of shear stress at the top is also changed. However, the most unfavorable loading condition of vertical displacement remains unchanged. The tensile stress at the bottom of about 1/4 span of the longitudinal joint, the shear stress at the top of intersection of transverse and longitudinal joint, together with the vertical displacement at the central part of longitudinal joint, are taken as design indices during the structural design of continuously reinforced concrete pavement on the two-way curved arch bridge. The results are helpful for the design of continuously reinforced concrete pavement on unequal- thickness base for the two-way curved arch bridge. 展开更多
关键词 two-way curved arch bridge bridge deckpavement unequal-thickness base continuously reinforcedconcrete pavement unfavorable loading condition finiteelement method （FEM）
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Application of LRB isolation technology in continuous girder bridges 认领 引用
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作者 刘文静 李黎 叶昆 《Journal of Southeast University(English Edition)》 EI CAS 2011年第2期196-200,共5页
This paper summarizes the superiority of lead-rubber beating （LRB） continuous girder bridges. The research method for isolation performance is discussed when pile-soil interaction is considered. By the finite elemen... This paper summarizes the superiority of lead-rubber beating （LRB） continuous girder bridges. The research method for isolation performance is discussed when pile-soil interaction is considered. By the finite element method and self-compiling program, a systematic study of the reliability of LRB continuous girder bridges is given by the use of different indicators, including the riding comfort of the LRB system, the pounding and dynamic stability when the LRB system is subjected to seismic excitations, and the reliability of the LRB system when subjected to other common horizontal loads. The results show that the LRB system has obvious advantages over the traditional continuous girder structure. The LRB isolation effect remains good even when pile-soil interaction is considered; the vertical rigidity of the LRB guarantees desirable riding comfort. The LRB demonstrates good reliability when subjected to the effects of braking, wind loads and temperature. However, it is also pointed out that the pounding of the LRB system subjected to earthquakes must be avoided, and the dynamic stability may be reduced when the LRB system has higher piers and generates a larger displacement in a strong earthquake. Useful advice and guidance are proposed for engineering application. 展开更多
关键词 lead-robber bearing （ LRB）- isolation technology continuous girder bridge
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Analysis on influence of seismic travelling wave effect on semi-active control for long-span rigid-continuous bridge 认领 引用 被引量：1
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作者 亓兴军 李小军 周国良 《Acta Seismologica Sinica(English Edition)》 2006年第2期199-206,共8页
The analysis approach of semi-active control for long-span rigid-continuous bridge under seismic travelling wave input is established. Magnetorheological dampers are set on the positions of the bridge beatings. The se... The analysis approach of semi-active control for long-span rigid-continuous bridge under seismic travelling wave input is established. Magnetorheological dampers are set on the positions of the bridge beatings. The semi-active control calculation and analysis are performed for a five-span rigid-continuous bridge under seismic travelling waves with different apparent surface velocities. The results indicate that travelling wave effect remarkably influences the uncontrolled seismic responses, the semi-active control seismic responses and vibration control effects for the long-span rigid-continuous bridge. It is disadvantageous to the responses of the beams and the piers under the travelling wave input with lower apparent surface velocity, and travelling wave effect can decrease the vibration control effects evidently. Therefore, the travelling wave effect should be considered for the selection of the parameter values of semi-active control system in order to get the designing control effect. 展开更多
关键词 travelling wave effect semi-active control long-span rigid-continuous bridge magnetorheoiogicai damper
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Study on Impact Coefficient Calculation of Long Span Curved Continuous Rigid Frame Bridge Based on Principal Component-stepwise Regression 认领 引用
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作者 HAN Zhi-qiang ZUO Xin-dai +2 位作者 ZHOU Yong-jun LIU Shi-Zhong JIN Min-Jie 《Journal of Highway and Transportation Research and Development(English Edition)》 2022年第1期9-19,共11页
In order to determine the calculation formula of impact coefficient of long-span curved continuous rigid frame bridge,Based on the mechanism of structural dynamics and vehicle-bridge coupling,the vibration equation of... In order to determine the calculation formula of impact coefficient of long-span curved continuous rigid frame bridge,Based on the mechanism of structural dynamics and vehicle-bridge coupling,the vibration equation of vehicles and bridges is established.The vehicle bridge interaction is determined through the wheel-bridge displacement coordination relationship,and the vehicle-bridge coupling analysis module of the long-span curved continuous rigid frame bridge is compiled by using MATLAB software.The dimensionality of multiple parameters is reduced by using the principal component analysis method.Comprehensively considering the target parameters with eigenvalue greater than 1 and cumulative contribution rate of variance greater than 90%,the bridge deck roughness,radius of curvature and pier height are determined as the main sensitive parameters.The calculation formulas of bridge deflection,bending moment and torque impact.coefficient are fitted and regressed by stepwise regression method.The result shows that:(1)the impact coefficient of bridge deflection is significantly affected by the bridge deck roughness and pier height,while the curvature radius has little influence on it;(2)the impact coefficient of bridge bending moment is significantly affected by the bridge deck roughness,while the pier height and curvature radius have little influence on it;(3)the bridge torque impact coefficient is greatly affected by the bridge deck roughness and curvature radius,while the pier height has little influence on it.The correlation coefficients of the bridge impact coefficient calculation formula fitted by regression are greater than O.94,the correlation is good,and the standardized correlation coefficients of bridge deck roughness in al impact coefficient calculation formulas are more than O.9,indicating that this factor has a great influence on the impact coefficient of the long-span curved continuous rigid frame bridge.It is suggested to consider this factor in subsequent specification revisions. 展开更多
关键词 bridge engineering impact coefficient principal component-stepwise regression curved continuous rigid frame bridge bridge deck roughness
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