压弯剪扭耦合作用下RC圆柱桥墩等效塑性铰长度研究  

Research on Equivalent Plastic Hinge Length of RC Cylindrical Pier Under Compression-Bending-Shear-Torsion Coupling

作　　者：焦驰宇[1] 刘洋 时晓鹏 龙佩恒[1] 吴宜峰 JIAO Chi-yu;LIU Yang;SHI Xiao-peng;LONG Pei-heng;WU Yi-feng(Engineering Structure and New Materials Research Center of Beijing Higher Education Institutions at Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China;Hebei Daoqiao Engineering Testing Co.,Ltd.,Shijiazhuang 050018,China)

机构地区：[1]北京建筑大学工程结构与新材料北京高等学校工程研究中心,北京100044 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [3]河北道桥工程检测有限公司,河北石家庄050018

出　　处：《桥梁建设》2022年第5期44-51,共8页Bridge Construction

基　　金：国家自然科学基金项目(52078023,51908024);北京建筑大学双塔计划“建大英才”项目(2016);土木工程防灾国家重点实验室开放基金项目(SLDRCE-14-02)。

摘　　要：为保证小半径曲线桥圆柱桥墩在压弯剪扭耦合作用下等效塑性铰长度计算的准确性,基于22根钢筋混凝土(RC)圆柱桥墩拟静力试验数据,以扭弯比为主要影响参数提出压弯剪扭耦合作用下RC圆柱桥墩的等效塑性铰长度线性回归拟合公式。根据试验结果对拟合公式和不同规范中的计算公式进行评估,并对拟合公式进行修正。结果表明:扭转作用会影响桥墩等效塑性铰长度,所提出的拟合公式由于考虑了扭转效应的影响,在计算耦合作用下圆柱桥墩等效塑性铰长度时结果具有较高的准确性和保证率;规范中的公式均没有考虑扭转作用的影响,等效塑性铰长度计算结果离散性较大,会导致设计偏不安全。因此所提出的公式更适合压弯剪扭耦合作用下圆柱桥墩的等效塑性铰长度计算。Based on the quasi-static test data of 22 RC cylindrical piers,the calculation accuracy of the equivalent plastic hinge lengths in piers of the sharp-radius curved bridge under compression-bending-shear-torsion coupling is examined,and with the torsion-bending ratio as the primary influential factor,a linear regression fitting formula is proposed.The proposed fitting formula and the calculation formulas given in different specifications are evaluated,against the test results,and afterwards,the fitting formula is modified.The results demonstrate that the torsional effect will affect the equivalent plastic hinge lengths of the pier.Given that the proposed fitting formula takes into account the impact of torsional effect,the calculation results of the equivalent plastic hinge lengths under the coupling effect are of high accuracy and guarantee rate.The formulas given in the specifications do not count the torsional effect,the calculation results of the equivalent plastic hinge lengths are highly discrete,which will lead to insufficient design safety margin.The proposed formula is proved more effective in calculating the equivalent plastic hinge lengths in piers under compression-bending-shear-torsion effect.

关 键 词：曲线桥 桥墩 压弯剪扭耦合作用 等效塑性铰长度 线性回归拟合公式 保证率 拟静力试验 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]