非等高RC双柱墩顺桥向弯扭性能试验研究及有限元分析  

EXPERIMENTAL STUDY AND FINITE ELEMENT ANALYSIS ON FLEXURAL AND TORSIONAL PERFORMANCE OF UNEQUAL-HEIGHT RC DOUBLE-COLUMN PIERS ALONG BRIDGE DIRECTION

作　　者：曾兴贵 谢宝雄 姜绍飞[3] ZENG Xing-gui;XIE Bao-xiong;JIANG Shao-fei(Institute of Civil Engineering,Putian University,Putian,Fujian 351100,China;Engineering Research Center of Disaster Prevention and Mitigation of Southeast Coastal Engineering Structures(JDGC03),Fujian Province University,Putian,Fujian 351100,China;College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]莆田学院土木工程学院,福建莆田351100 [2]东南沿海工程结构防灾减灾福建省高校工程研究中心(JDGC03),福建莆田351100 [3]福州大学土木工程学院,福建福州350108

出　　处：《工程力学》2025年第3期250-261,共12页Engineering Mechanics

基　　金：国家“十三五”重点专项课题项目(2020YFD1100403);福建省科技厅面上项目(2020J01911);科研启动项目(2019007)。

摘　　要：为了研究柱高比(即为双柱墩中2根不同高度柱的柱高之比)对非等高RC双柱墩顺桥向弯扭性能的影响,对2个柱高比不同的非等高RC双柱墩在压弯扭复合受力下进行了拟静力加载试验,得到了双柱墩试件的剪力-位移滞回曲线、扭矩-扭转角滞回曲线以及相应的骨架曲线。基于Abaqus建立了非等高双柱墩的有限元模型,并用试验结果验证了其准确性,随后开展了参数分析,研究柱高比、轴压比和配箍率对弯扭作用下的非等高RC双柱墩顺桥向抗震性能的影响。研究结果表明:柱高比的减小会增大双柱墩顺桥向抗弯承载力,降低了构件的抗扭耗能和抗扭承载力;随着柱高比的减小,扭转效应增强,降低了非等高双柱墩的延性变形能力,且扩大了非等高双柱墩的损伤区域;为避免非等高双柱墩中的矮柱先进入弯剪破坏,建议其柱高比不小于0.67;轴压比的增大降低了弯扭复合作用下非等高双柱墩的抗弯承载力;增大配箍率可显著提高试件抗扭承载力,对可能受扭的双柱墩可适当增大配箍率。To study the influence of column height ratio(namely the ratio of column heights of two columns with different heights)on flexural and torsional performance of Unequal-Height RC Double-column pier along bridge direction,quasi-static loading tests were carried out on two Unequal-Height RC Double-column piers with different column height ratio under the combined action of compression,bending and torsion.The shear-displacement hysteresis curves,torque-torsion hysteresis curves and corresponding skeleton curves of the double-column pier were obtained.Based on Abaqus,the finite element model of Unequal-Height RC Double-column pier was established,and its accuracy was verified by experimental results.Then parametric analysis was carried out to study the effects of column height ratio,axial compression ratio and stirrup ratio on the seismic performance of unequal-height double-column pier under the combined action of bending and torsion.The results show that the reduction of column height ratio increases the flexural bearing capacity along bridge direction,and reduces the torsional energy dissipation and torsional bearing capacity of the specimens.With the decrease of the column height ratio,the torsional effect is enhanced,which reduces the ductile deformation capacity of the double-column pier and enlarges the damage area of the unequal-height double-column pier.In order to avoid the bending shear failure of the short column of the unequal-height double-column pier,the column height ratio is recommended to be no less than 0.67.With the increase of axial compression ratio,the flexural capacity of unequal-height double-column pier under the combined action of bending and torsion is decreased.The torsional bearing capacity of specimens can be significantly improved by increasing the hoop ratio;therefore the hoop ratio can be appropriately increased for the unequal-height double-column pier that may be subjected to torsion.

关 键 词：钢筋混凝土非等高双柱墩 弯扭复合作用 顺桥向 柱高比 抗震性能 有限元分析 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]