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Comparative Study on Load-Carrying Capacity of Insect-Scale Microrobots with Rear-Leg Actuation and Front-Leg Actuation Configurations 认领 引用 被引量：1
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作者 Lizhao Wei Wencheng Zhan +7 位作者 Xian Yu Feng Yan Haoxuan Wang Jiaming Leng Heming Xu Pei Cai Xiaojun Yan Zhiwei Liu 《Journal of Bionic Engineering》 SCIE EI CSCD 2025年第5期2383-2395,共13页
Locomotion performance degradation after carrying payloads is a significant challenge for insect-scale microrobots.Previously,a legged microrobot named BHMbot with a high load-carrying capacity based on front-leg actu... Locomotion performance degradation after carrying payloads is a significant challenge for insect-scale microrobots.Previously,a legged microrobot named BHMbot with a high load-carrying capacity based on front-leg actuation configuration and efficient running gait was proposed.However,insects,mammals and reptiles in nature typically use their powerful rear legs to achieve rapid running gaits for predation or risk evasion.In this work,the load-carrying capacity of the BHMbots with front-leg actuation and rear-leg actuation configurations is comparatively studied.Simulations based on a dynamic model with four degrees of freedom,along with experiments,have been conducted to analyze the locomotion characteristics of the two configurations under different payload masses.Both simulation and experimental results indicate that the load-carrying capacity of the microrobots is closely related to their actuation configurations,which leads to different dynamic responses of the microrobots after carrying varying payload masses.For microrobots with body lengths of 15 mm,the rear-leg actuation configuration exhibits a 31.2%enhancement in running speed compared to the front-leg actuation configuration when unloaded.Conversely,when carrying payloads exceeding 5.7 times the body mass(350 mg),the rear-leg actuation configuration demonstrates an 80.1%reduction in running speed relative to the front-leg actuation configuration under the same payload conditions. 展开更多
关键词 Insect-scale legged microrobots Actuation configurations Load-carrying capacity Locomotion analysis
Impact of the thermal effect on the load-carrying capacity of a slipper pair for an aviation axial-piston pump 认领 引用 被引量：10
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作者 Hesheng TANG Yaobao YIN +2 位作者 Yan REN Jiawei XIANG Jun CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2018年第2期395-409,共15页
A thermal hydraulic model based on the lumped parameter method is presented to analyze the load-carrying capacity of a slipper pair in an aviation axial-piston pump under specified operating conditions. Both theoretic... A thermal hydraulic model based on the lumped parameter method is presented to analyze the load-carrying capacity of a slipper pair in an aviation axial-piston pump under specified operating conditions. Both theoretical and experimental results are presented to demonstrate the validity of the thermal hydraulic model. The results illustrate that the squeezing force and thermal wedge bearing force are the main factors that affect the film thickness and load-carrying capacity.At high oil temperature and high load pressure, the film thickness decreases with increasing clamping force due to a combined action of the squeezing bearing force and the thermal wedge bearing force, but the load-carrying capacity will increase. An increase of the film thickness is proven to be beneficial under high shaft rotational speed but especially dangerous as it strongly increases the ripple amplitude of the film thickness, which leads to decreasing the load-carrying capacity. The structural parameters of the slipper can be optimized to achieve desired performance, such as the slipper radius ratio and orifice length diameter ratio. To satisfy the requirement of the load-carrying capacity, the slipper radius ratio should be selected from 1.4 to 1.8, and the orifice length diameter ratio should be selected from 4 to 5. 展开更多
关键词 Aviation axial piston pumpFluid lubrication Load-carrying capacity Slipper pair Thermal effect
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Shape design of the reinforcement for bending load-carrying capacity of under-matched butt joint under four-point bending load 认领 引用 被引量：1
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作者 王佳杰 杨建国 +3 位作者 张敬强 董志波 方洪渊 刚铁 《China Welding》 EI CAS 2012年第3期50-54,共5页
To improve the bending load-carrying capacity （ BLCC） of under-matched butt joint under four-point bending load in the elastic stage, the shape design of the reinforcement is studied based on the theoretics of mecha... To improve the bending load-carrying capacity （ BLCC） of under-matched butt joint under four-point bending load in the elastic stage, the shape design of the reinforcement is studied based on the theoretics of mechanics of materials. The concept, criterion, realization condition and design proposal of equal bending load-carrying capacity （EBLCC） are put forward. The theoretical analysis results have been verified by the finite element method. The simulation results are coincident basically with the ones of theoretical analysis. The research results show that the shape design of the reinforcement of EBLCC can improve BLCC of under-matched butt joint and the unilateral-side type reinforcement can replace double-side symmetry 展开更多
关键词 under-matched joint equal bending load-carrying capacity shape design of the reinforcement finite elementmethod
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Lateral load-carrying capacity analyses of composite shear walls with double steel plates and filled concrete with binding bars 认领 引用 被引量：1
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作者 周德源 刘凌飞 朱立猛 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第8期2083-2091,共9页
A method is developed to predict the lateral load-carrying capacity of composite shear walls with double steel plates and filled concrete with binding bars(SCBs). Nonlinear finite element models of SCBs were establish... A method is developed to predict the lateral load-carrying capacity of composite shear walls with double steel plates and filled concrete with binding bars(SCBs). Nonlinear finite element models of SCBs were established by using the finite element tool, Abaqus. Tie constraints were used to connect the binding bars and the steel plates. Surface-to-surface contact provided by the Abaqus was used to simulate the interaction between the steel plate and the core concrete. The established models could predict the lateral load-carrying capacity of SCBs with a reasonable degree of accuracy. A calculation method was developed by superposition principle to predict the lateral load-carrying capacity of SCBs for the engineering application. The concrete confined by steel plates and binding bars is under multi-axial compression; therefore, its shear strength was calculated by using the Guo-Wang concrete failure criterion. The shear strength of the steel plates of SCBs was calculated by using the von Mises yielding criterion without considering buckling. Results of the developed method are in good agreement with the testing and finite element results. 展开更多
关键词 composite shear wall double steel plate binding bar lateral load-carrying capacity nonlinear finite element analysis
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Load-carrying capacity and practical calculation method for hollow cylinder joints connected with H-shaped beams 认领 引用
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作者 Hui WU Bo-qing GAO Qiang CHEN 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2012年第3期174-181,共8页
A type of hollow cylinder joints connected with H-shaped beams is proposed for spatial structures. Based on von Mises yield criterion and perfect elasto-plasticity model, a series of finite element models of the joint... A type of hollow cylinder joints connected with H-shaped beams is proposed for spatial structures. Based on von Mises yield criterion and perfect elasto-plasticity model, a series of finite element models of the joints is established, in which the effect of geometric nonlinearity is taken into account. Then mechanical behavior and load-carrying capacity of the joints were investigated, which were subjected to axial load, in- and out-plane bending moments, and their combinations. The results show that the ultimate loads of the joints are determined by the maximum displacement. Furthermore, the case of one joint connected with multiple beams was discussed. Experiments on a set of typical full-scale joints were conducted to understand the structural behavior and the failure mechanism of joint, and also to validate the finite element models. Finally, the practical calculation method was established through finite elements analysis (FEA) results and numerical fitting. The results show that the joints are more ductile and materially economical than welded hollow spherical joints, and the practical calculation method can provide a reference for direct design and the revision of relevant design codes. 展开更多
关键词 Hollow cylinder joints H-shaped beams Load-carrying capacity Finite elements analysis （FEA） Practical calcu-lation method
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Prediction of the load-carrying capacity of reinforced concrete connections under post-earthquake fire 认领 引用 被引量：12
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作者 Aydin SHISHEGARAN Mehdi MORADI +2 位作者 Mohammad Ali NAGHSH Behnam KARAMI Arshia SHISHEGARAN 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2021年第6期441-466,共26页
Finding out the most effective parameters relating to the resistance of reinforced concrete connections(RCCs)is an important topic in structural engineering.In this study,first,a finite element(FE)model is developed f... Finding out the most effective parameters relating to the resistance of reinforced concrete connections(RCCs)is an important topic in structural engineering.In this study,first,a finite element(FE)model is developed for simulating the performance of RCCs under post-earthquake fire(PEF).Then surrogate models,including multiple linear regression(MLR),multiple natural logarithm(Ln)equation regression(MLn ER),gene expression programming(GEP),and an ensemble model,are used to predict the remaining load-carrying capacity of an RCC under PEF.The statistical parameters,error terms,and a novel statistical table are used to evaluate and compare the accuracy of each surrogate model.According to the results,the ratio of the longitudinal reinforcement bars of the column(RLC)has a significant effect on the resistance of an RCC under PEF.Increasing the value of this parameter from 1%to 8%can increase the residual load-carrying capacity of an RCC under PEF by 492.2%when the RCC is exposed to fire at a temperature of 1000°C.Moreover,based on the results,the ensemble model can predict the residual load-carrying capacity with suitable accuracy.A safety factor of 1.55 should be applied to the results obtained from the ensemble model. 展开更多
关键词 Reinforced concrete connection(RCC) Post-earthquake fire(PEF) Surrogate models Load-carrying capacity Gene expression programming(GEP) Ensemble model
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A Discusion on Limited Load-Carrying Capacity of Rectangular Plates 认领 引用
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作者 Li Changchun Shi Depei Wang Bocheng Associate Professor, Department of Naval Architecture and Ocean Engineering, Jiao Tong University,Shanghai 200030Engineer, Shangsha Shipyard, Shangsha 410013 《China Ocean Engineering》 SCIE EI 1996年第4期401-408,共8页
The elastic-plastic method is often used in designing the inner flat bulkhead plates of submarines, and the upper structure of ships and drilling platforms. Such bulkhead plates can bear the load only once. For the im... The elastic-plastic method is often used in designing the inner flat bulkhead plates of submarines, and the upper structure of ships and drilling platforms. Such bulkhead plates can bear the load only once. For the improvement of the load-carrying capacity or the reduction of the weight of plates, the yield line analytical method is employed in this paper to design the bulkhead plate to improve economy and increase the effiective load. Besides, a further sutdy of this method has been made theoretically and experimentally, and the data of the limited load-carrying capacity of the plate have been obtained. Furthermore, the safety coefficients for such a method are presented, which can be used as reference for related departments and staffs. 展开更多
关键词 elastic-plastic design limited load-carrying capacity yield line analytical method safety coefficient
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Boundary slippage for generating hydrodynamic load-carrying capacity 认领 引用
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作者 张勇斌 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2008年第9期1155-1164,共10页
Boundary slippage is used to generate the load-carrying capacity of the hydrodynamic contact between two parallel plane surfaces. In the fluid inlet zone, the fluidcontact interfacial shear strength on a stationary su... Boundary slippage is used to generate the load-carrying capacity of the hydrodynamic contact between two parallel plane surfaces. In the fluid inlet zone, the fluidcontact interfacial shear strength on a stationary surface is set at low to generate boundary slippage there, while in the fluid outlet zone the fluid-contact interfacial shear strength on the stationary surface is set at high enough to prevent the occurrence of boundary slippage. The fluid-contact interfacial shear strength on the entire moving surface is set at high enough to prevent boundary slippage on the moving surface. These hydrodynamic contact configurations are analyzed to generate the pronounced load-carrying capacity. The optimum ratio of the outlet zone width to the inlet zone width for the maximum load-carrying capacity of the whole contact is found to be 0.5. 展开更多
关键词 hydrodynamic contact load-carrying capacity boundary slippage
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Using a GIS to Assessment the Load-Carrying Capacity of Soil Case of Berhoum Area, Hodna Basin, (Eastern Algeria) 认领 引用 被引量：1
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作者 Amar Guettouche Farid Kaoua 《Journal of Geographic Information System》 2013年第5期492-497,共6页
The concept of load-carrying capacity of the soil can be evaluated by two main components: permissible stress and permissible depth;and therefore, running it begins its assessment that allows an outline of exploitatio... The concept of load-carrying capacity of the soil can be evaluated by two main components: permissible stress and permissible depth;and therefore, running it begins its assessment that allows an outline of exploitation. Nevertheless, the assessment of the load-carrying capacity made the object of several works of research and many models, based on the multi-criteria analysis, have been established. This work examines the contribution of GIS approach to assessment load-carrying capacity of the soil. This one has been finished in two practicums: 1) Assessment of the capacity of soil by a multi-criteria approach, using the Weighted Sum Model (WSM);2) It brought to use the GIS approach to evaluate and spatialize degree of soil bearing stresses resulting from the buildings, as well as load distribution. The method has been applied to the Berhoum area of Hodna Basin, in eastern Algeria, where each is characterized by its various natural properties and density of equipment. Final results are better in the classification of the degree of load-carrying capacity possible in each site. This results in allowing exploiters to program their optimal designs for the rational management of the area. 展开更多
关键词 Load-Carrying Capacity WSM GIS Berhoum Hodna Basin’s Algeria
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Parametric modeling and interpretable machine learning prediction on load-carrying capacity of a circular hollow section X-joint 认领 引用
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作者 Yuelin ZHANG Hao WANG +2 位作者 Shuai ZHENG Ling LIU Dajiang WU 《Frontiers of Structural and Civil Engineering》 SCIE EI CAS CSCD 2025年第8期1287-1304,共18页
The aim of this paper is to explore the effect of geometrical parameters on ultimate load-carrying capacity of a circular hollow section(CHS)X-joint under axial compression of the brace end.First of all,finite element... The aim of this paper is to explore the effect of geometrical parameters on ultimate load-carrying capacity of a circular hollow section(CHS)X-joint under axial compression of the brace end.First of all,finite element(FE)model to calculate ultimate load-carrying capacity of the CHS X-joint subjected to uniaxial load of the brace is constructed,and the calculated load–displacement curves are compared to the experimental ones.After validation of the FE model,46080 groups of FE calculation models with different geometrical parameters are generated by means of parametric modeling.Subsequently,eight variables including gusset thickness and chord thickness are set as input to predict load-carrying capacity of the CHS X-joint by four machine learning(ML)algorithms,i.e.,Generalized Regression Neural Network,Support Vector Machine,random forest(RF),and Extreme Gradient Boosting(XGBoost).Finally,the constructed ML prediction models are interpreted by SHapley Additive exPlanations,to explore the impact weight of each factor on ultimate load-carrying capacity of the joint.The results show that all the four models can predict the load-carrying capacity of the subject accurately,with all the R2 values greater than 0.97.In addition,RF model yields the minimum mean-square error,Root Mean Squared Error,Mean Absolute Error,and Mean Absolute Percentage Error values,and the greatest R2 value,while the prediction accuracy of XGBoost is relatively worse.Among all the eight considered geometrical parameters,brace diameter has the strongest impact on load-carrying capacity of the joint,followed by chord thickness,chord ring width,chord ring thickness,brace ring width,and brace thickness,while the thicknesses of the gusset plate and brace have marginal influence on load-carrying capacity.The study of the current paper can provide guidelines for dimension design of CHS X-joints. 展开更多
关键词 machine learning SHAP-based interpretability load-carrying capacity CHS X-joint parametric modeling
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Imparting Ductility to FRP-Reinforced Concrete Beams Through Compression Zone Confinement 认领 引用
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作者 Shi-Shun Zhang Xiao-Bing Hu Jin-Guang Teng 《Engineering》 SCIE EI CSCD 2026年第6期282-297,共16页
In recent decades,fiber-reinforced polymer(FRP)bar-reinforced concrete(FRP-RC)beams have attracted considerable attention as a corrosion-free beam form.However,FRP-RC beams have limited practical applications owing to... In recent decades,fiber-reinforced polymer(FRP)bar-reinforced concrete(FRP-RC)beams have attracted considerable attention as a corrosion-free beam form.However,FRP-RC beams have limited practical applications owing to their much lower ductility compared to conventional steel bar-reinforced concrete(steel-RC)beams.To improve the ductility of FRP-RC beams,this study presents an innovative sectional form for FRP-RC beams in which the compression zone concrete is confined with FRP spirals/hoops.With such a sectional form,the ductility of the beam is derived from the ductile behavior of confined concrete in the compression zone instead of the ductile behavior of steel yielding in a conventional steel-RC beam.An experimental program consisting of eight large-scale FRP-RC beams was conducted to validate the effectiveness of this sectional form,in which the variables investigated include the pitch of the FRP spiral used to offer confinement,amount of longitudinal tension FRP bars,and FRP confinement configuration.The test results demonstrate the effectiveness of FRP confinement in improving the ductility and load-carrying capacity of FRP-RC beams;for one of the beams tested in the present study,ductility was increased by 150%with only a corresponding FRP cost increase of around 7%.The significant effects of design parameters on the behavior of such FRP-RC beams are clearly revealed.Finally,a finite element model for such FRP-RC beams was established and verified using the test results. 展开更多
关键词 FRP bar-reinforced concrete(FRP-RC)beam Ductility FRP confinement Compression zone Load-carrying capacity
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Elastic Buckling of Bionic Cylindrical Shells Based on Bamboo 认领 引用 被引量：35
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作者 Jian-feng Ma Wu-yi Chen +1 位作者 Ling Zhao Da-hai Zhao 《Journal of Bionic Engineering》 SCIE EI 2008年第3期231-238,共8页
High load-bearing efficiency is one of the advantages of biological structures after the evolution of billions of years. Biomimicking from nature may offer the potential for lightweight design. In the viewpoint ofrnec... High load-bearing efficiency is one of the advantages of biological structures after the evolution of billions of years. Biomimicking from nature may offer the potential for lightweight design. In the viewpoint ofrnechanics properties, the culm of bamboo comprises of two types of cells and the number of the vascular bundles takes a gradient of distribution. A three-point bending test was carried out to measure the elastic modulus. Results show that the elastic modulus of bamboo decreases gradually from the periphery towards the centre. Based on the structural characteristics of bamboo, a bionic cylindrical structure was designed to mimic the gradient distribution of vascular bundles and parenchyma cells. The buckling resistance of the bionic structure was compared with that of a traditional shell of equal mass under axial pressure by finite element simulations. Results show that the load-bearing capacity of bionic shell is increased by 124.8%. The buckling mode of bionic structure is global buckling while that of the conventional shell is local buckling. 展开更多
关键词 bionic design bamboo culm thin-walled cylindrical structure buckling load-carrying efficiency
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Flexural behavior of steel reinforced engineered cementitious composite beams 认领 引用 被引量：6
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作者 Dong Bingqing Pan Jinlong Lu Cong 《Journal of Southeast University(English Edition)》 EI CAS 2019年第1期72-82,共11页
In order to enhance the durability of steel encased concrete beams, a new type of steel reinforced engineered cementitious composite(SRECC) beam composed of steel shapes, steel bars and ECC is proposed. The theoretica... In order to enhance the durability of steel encased concrete beams, a new type of steel reinforced engineered cementitious composite(SRECC) beam composed of steel shapes, steel bars and ECC is proposed. The theoretical analyses of the SRECC beam including crack propagation and stress-strain distributions along the depth of the composite beam in different loading stages are conducted. A theoretical model and simplified design method are proposed to calculate the load carrying capacity. Based on the proposed theoretical model, the relationship between the moment and corresponding curvature is derived. The theoretical results are verified with the finite element analysis. Finally, an extensive parametric study is performed to study the effect of the matrix type, steel shape ratio, reinforced bar ratio, ECC compressive strength and ECC tensile ductility on the mechanical behavior of SRECC beams. The results show that substitution concrete with ECC can effectively improve the bearing capacity and ductility of composite beams. The steel shape and longitudinal reinforcement can enhance the loading carrying capacity, while the ductility decreases with the increase of steel shape ratio. ECC compressive strength has significant effects on both load carrying capacity and ductility, and changing the ultimate strain of ECC results in a very limited variation in the mechanical behavior of SRECC beams. 展开更多
关键词 engineered cementitious composite(ECC) steel reinforced ECC(SRECC) composite beam flexural behavior ultimate load-carrying capacity
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Mechanical Behavior of Rectangular Steel-Reinforced ECC/Concrete Composite Column under Eccentric Compression 认领 引用 被引量：3
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作者 潘金龙 鲁冰 +2 位作者 顾大伟 夏正昊 夏天阳 《Transactions of Tianjin University》 EI CAS 2015年第3期269-277,共9页
In order to improve the seismic performance, deformation ability and ultimate load-carrying capacity of columns with rectangular cross section, engineered cementitious composite （ECC） is introduced to partially subs... In order to improve the seismic performance, deformation ability and ultimate load-carrying capacity of columns with rectangular cross section, engineered cementitious composite （ECC） is introduced to partially substitute concrete in the edge zone of reinforced concrete columns and form reinforced ECC/concrete composite columns. Firstly, based on the assumption of plane remaining plane and the simplified constitutive models, the calculation method of the load-carrying capacity of reinforced ECC/concrete columns is proposed. The stress and strain distribu- tions and crack propagation of the composite columns in different states of eccentric compressive loading are ana- lyzed. Then, nonlinear finite element analysis is conducted to study the mechanical performance of reinforced ECC/concrete composite columns with rectangular cross section. It is found that the simulation results are in good agreement with the theoretical results, indicating that the proposed method for calculating the load-carrying capacity of concrete/ECC composite columns is valid. Finally, based on the proposed method, the effects of ECC thickness, com- pressive strength of concrete and longitudinal reinforcement ratio on the mechanical performance of reinforced ECC/ concrete composite columns are analyzed. Calculation results indicate that increasing the thickness of ECC layer or longitudinal reinforcement ratio can effectively increase the ultimate load-carrying capacity of the composite column with both small and large eccentricity, but increasing the strength of concrete can only increase the ultimate Ioad- carrying capacity of the composite column with small eccentricity. 展开更多
关键词 engineered cementitious composite （ECC） steel-reinforced concrete ECC/concrete composite column eccentric compression behavior ultimate load-carrying capacity
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Mechanical Properties of Moso Bamboo Connections with External Clamp Steel Plates 认领 引用 被引量：2
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作者 Shidong Nie Song Ran +3 位作者 Di Wu Jieyu Chen Hui Wang Qike Wei 《Journal of Renewable Materials》 EI CAS 2022年第2期487-510,共24页
The Moso bamboo,a renewable green building material used in various new green buildings,have received exten-sive attention with the promotion of the concept of green buildings.To explore the mechanical properties of M... The Moso bamboo,a renewable green building material used in various new green buildings,have received exten-sive attention with the promotion of the concept of green buildings.To explore the mechanical properties of Moso bamboo connections with external clamp steel plates,the 16 specimens were designed by changing the bolt diameters and the end distances of the bolt holes.Their static tension tests were conducted to investigate bearing capacities and failure modes of different connection configurations.Based on test results,three failure modes of these connections were obtained,including the shear failure of bolt shank,bearing failure of bolt hole and punch-ing shear failure of the Moso bamboo.The influence of bolt diameters and end distances of bolt holes on bearing capacities of the connections was quantitatively analyzed.Based on a simplified mechanical model,the analytical models were deduced for the bolt shear failure and the bearing failure of bolt holes.The results showed that the predictive values are in substantial agreement with the experimental results.Finally,the design and manufacturing suggestions are recommended for this Moso bamboo connections. 展开更多
关键词 Moso bamboo connections external clamp steel plates load-carrying capacities failure modes the 5%d offset method mechanical model
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Experimental Evaluation of the Post-ultimate Strength Behavior of a Ship's Hull Girder in Waves 认领 引用 被引量：8
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作者 Weijun Xu Kazuhiro Iijima +1 位作者 Ryota Wada Masahiko Fujikubo 《Journal of Marine Science and Application》 2012年第1期34-43,共10页
Experimental investigations into the collapse behavior of a box-shape hull girder subjected to extreme wave-induced loads are presented.The experiment was performed using a scaled model in a tank.In the middle of the ... Experimental investigations into the collapse behavior of a box-shape hull girder subjected to extreme wave-induced loads are presented.The experiment was performed using a scaled model in a tank.In the middle of the scaled model,sacrificial specimens with circular pillar and trough shapes which respectively show different bending moment-displacement characteristics were mounted to compare the dynamic collapse characteristics of the hull girder in waves.The specimens were designed by using finite element(FE)-analysis.Prior to the tank tests,static four-point-bending tests were conducted to detect the load-carrying capacity of the hull girder.It was shown that the load-carrying capacity of a ship including reduction of the capacity after the ultimate strength can be reproduced experimentally by employing the trough type specimens.Tank tests using these specimens were performed under a focused wave in which the hull girder collapses under once and repetitive focused waves.It was shown from the multiple collapse tests that the increase rate of collapse becomes higher once the load-carrying capacity enters the reduction path while the increase rate is lower before reaching the ultimate strength. 展开更多
关键词 post-ultimate strength collapse behavior experimental evaluation load-carrying capacity hull girder
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Simplified Algorithm for Out-of-Plane Critical Loads of CFST Solid-Rib Arch 认领 引用 被引量：1
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作者 陈昀明 韦建刚 +2 位作者 黄蕾 李晓辉 陈宝春 《Journal of Donghua University(English Edition)》 EI CAS 2015年第5期782-786,806,共5页
The simplified algorithm for out-of-plane ultimate loadcarrying capacity of concrete-filled steel tubular( CFST) solid-rib arches under uniform vertical load was studied. The experimentally validated finite element mo... The simplified algorithm for out-of-plane ultimate loadcarrying capacity of concrete-filled steel tubular( CFST) solid-rib arches under uniform vertical load was studied. The experimentally validated finite element model was developed. The out-of-plane equivalent length coefficients of solid-rib arches were obtained using out-of-plane elastic eigenvalue buckling analysis. Then the out-ofplane elastic stability coefficient was plotted against the normalized slenderness ratio,and the out-of-plane eigenvalue buckling load or elastic buckling capability of arches was calculated. Lastly effects of different parameters on the out-of-plane ultimate load-carrying capacity of CFST solid-rib arches were determined using geometric and material nonlinear finite element analysis, and a simplified algorithm was established by fitting the out-of-plane elastic-plastic stability coefficient and normalized slenderness ratio using PerryRobertson formula. Ratio of the elastic stability coefficient to the elastic-plastic counterpart was plotted against the out-of-plane normalized slenderness ratio,from which the out-of-plane elasticplastic ultimate load-carrying capacity was determined according to the corresponding elastic buckling load. Results show that the proposed simplified algorithm can accurately predict the out-of-plane eigenvalue buckling load and the elastic-plastic ultimate loadcarrying capacity of the CFST solid-rib arches. 展开更多
关键词 concrete-filled steel tubular(CFST) solid-rib arch out-of-plant buckling ultimate load-carrying capacity simplified algorithm
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Steady Characteristics of the Water-Lubricated Conical Bearings 认领 引用
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作者 李胜波 敖宏瑞 +2 位作者 姜洪源 KORNEEV Andrey Yurievich SAVIN Leonid Alexeevich 《Journal of Donghua University(English Edition)》 EI CAS 2012年第2期115-122,共8页
The water-lubricated conical bearing has attracted attentions of researchers for its simple structure, easily adjusted gap （fdm thickness ）, lower friction loss, and less pollution in application. A mathematic model... The water-lubricated conical bearing has attracted attentions of researchers for its simple structure, easily adjusted gap （fdm thickness ）, lower friction loss, and less pollution in application. A mathematic model with consideration of the effects of turbulence, two-phase flow, and temperature on the pressure field at bearing surface is proposed here. Using this model, the Reynolds＇ equation and energy equation are solved in which the thermo- physical properties of the water as lubricant are taken into account. The dependency of characteristics of bearing, such as load-earrying capacity, flow rate （pumping losses ）, and frictional losses, on angular velocity, conical angle, and radial eccentricities, is presented. The research results are beneficial to the improvement of the efficiency of conical bearing and the environmental protection. 展开更多
关键词 water-lubricated conical bearing hybrid conical bearing load-carrying capacity flow rate： frictional and DumDine losses
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Behavior of RC two-way slabs strengthened with CFRP-steel grid under concentrated loading 认领 引用
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作者 Lu Yiyan Zhu Tao +1 位作者 Li Shan Zhang Haojun 《Journal of Southeast University(English Edition)》 EI CAS 2018年第3期331-339,共9页
A novel composite technique of orthogonally bonding carbon fiber-reinforced polymer （CFRP） strips and steel strips is proposed to improve the performance of reinforced concrete （RC） structures based on co-working ... A novel composite technique of orthogonally bonding carbon fiber-reinforced polymer （CFRP） strips and steel strips is proposed to improve the performance of reinforced concrete （RC） structures based on co-working of CFRP strips and steel strips. To verify the effectiveness of the method for strengthening RC two-way slabs, seven flat slabs with the dimensions of i 500 mm x 1 500 mm x 70 mm and an internal reinforcement ratio of 0.22% were prepared and tested until failure under concentrated loading, of which one was unstrengthened, one was strengthened with CFRP strips bonded to its soffit making a grid pattern （termed the CFRP grid）, and five were strengthened with a hybrid grid of CFRP strips and steel strips in two orthogonal directions （termed the CFRP-steel grid） to the bottom with steel bolt anchorage. The investigation parameters are the strengthening method, the strip spacing （150, 200, and 250 mm） and the layers of CFRP strips （one layer, two layers, and three layers of CFRP strips are applied for CFRP-steel grid）. The experimental results show that the strengthening RC two-way slabs with CFRP-steel grid are effective in delaying concrete cracking and enhancing the load-carrying capacity and deformability in comparison to the CFRP grid strengthening. The yield-line analysis model is proposed to predict the load-carrying capacity of the strengthened slabs. The prediction results are in good agreement with the experimental results. 展开更多
关键词 reinforced concrete two-way slab strengtheningmethod carbon fiber-reinforced polymer （CFRP）-steel grid load-carrying capacity deflection yield-line
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Experimental Study on the Reduction Effect of Pit Texture on Disassembly Damage for Interference Fit 认领 引用 被引量：1
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作者 Dan Zhou Yi Xu +2 位作者 Xin Gao Haihong Huang Songjiang Lv 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2023年第2期249-260,共12页
After remanufacturing disassembly,several kinds of friction damages can be found on the mating surface of interference fit.These damages should be repaired and the cost is closely related to the severity of damages.In... After remanufacturing disassembly,several kinds of friction damages can be found on the mating surface of interference fit.These damages should be repaired and the cost is closely related to the severity of damages.Inspired by the excellent performance of surface texture in wear reduction,5 shapes of pit array textures are added to the specimens’surface to study their reduction effect of disassembly damage for interference fit.The results of disassembly experiments show that the order of influence of texture parameters on disassembly damage is as follows:equivalent circle diameter of single texture,texture shape and texture surface density.The influence of equivalent circle diameter of single texture and texture shape are obviously more significant than that of texture surface density.The circular texture with a surface density of 30%and a diameter of 100μm shows an excellent disassembly damage reduction effect because of its perfect ability of abrasive particle collection.And the probability of disassembly damage formation and evolution is also relatively small on this kind of textured surface.Besides,the load-carrying capacity of interference fit with the excellent texture is confirmed by load-carrying capacity experiments.The results show that the load-carrying capacity of the excellent texture surface is increased about 40%compared with that of without texture.This research provides a potential approach to reduce disassembly damage for interference fit. 展开更多
关键词 Remanufacturing Interference fit Disassembly damage Surface texture Load-carrying capacity
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