椭圆墩底隔震桥墩滞回特性研究  

Study on hysteresis characteristics of isolated pier with elliptical pier bottom

作　　者：方蓉 张文学 张国伟[3] 焦驰宇[3,4] FANG Rong;ZHANG Wenxue;ZHANG Guowei;JIAO Chiyu(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Multi-Functional Shaking Tables Laboratory,Beijing University of Civil Engineering and Architecture,Beijing 102616,China;Engineering Structure and New Materials Research Center of Beijing Higher Education Institutions,Beijing,University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学土木与交通工程学院,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]北京建筑大学大型多功能振动台阵实验室,北京102616 [4]北京建筑大学工程结构与新材料北京市高等学校工程研究中心,北京100044

出　　处：《华中科技大学学报(自然科学版)》2025年第2期78-87,共10页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金面上项目(51778022);北京市博士后工作经费资助项目(2023-zz-137);北京建筑大学青年教师科研能力提升计划资助项目(X23006)。

摘　　要：为研究椭圆墩底隔震桥墩的滞回特性,对加固前后的椭圆墩底隔震桥墩(IP-EPB)进行拟静力试验,对比分析加固前后椭圆墩底隔震桥墩的滞回特性.在此基础上,建立椭圆墩底隔震桥墩的有限元模型,研究椭圆长半径和椭圆长短半径之比对其滞回特性的影响.研究结果表明:加固墩底马蹄可以提高椭圆墩底隔震桥墩的抗侧承载力和抗侧刚度,减小其残余位移,降低耗能能力;增大椭圆长半径可以提高椭圆墩底隔震桥墩的抗侧承载力和耗能能力,但是较大的椭圆长半径会导致墩底发生屈服破坏,因此建议椭圆长半径与墩底截面高度的比值取1.00~1.67;增大椭圆长短半径之比会提高椭圆墩底隔震桥墩的自复位能力,减小耗能能力.为了保证椭圆墩底隔震桥墩具有良好的耗能和自复位能力,建议椭圆长短半径之比取3~5.To study the hysteresis characteristics of isolated pier with elliptical pier bottom(IP-EPB),the pseudo-static tests were conducted on IP-EPBs before and after reinforcement,and the hysteresis characteristics of IP-EPBs before and after reinforcement were compared and analyzed.On this basis,the finite element model of an IP-EPB was established to study the effect of the long radius of the ellipse as well as the ratio of the long to short radi of the ellipse on the hysteresis characteristics of the IP-EPB.The results show that the lateral strength capacity and lateral stiffness of the IP-EPB can be improved by reinforcing pier bottom horseshoe,and the residual displacement and energy dissipation capacity of the IP-EPB are reduced by reinforcing pier bottom horseshoe.Increasing the long radius of the ellipse can enhance the lateral strength capacity and energy dissipation capacity of the IP-EPB.However,a larger value of long radius of the ellipse can lead to the yield failure of pier bottom.Therefore,it is recommended that the ratio of the long radius of the ellipse to the sectional height of pier bottom is 1.00~1.67.Increasing the ratio of the long to short radi of the ellipse can improve the self-centering ability of the IP-EPB and reduce the energy dissipation capacity of the IP-EPB.In order to ensure that the IP-EPB has good energy dissipation and self-centering abilities,it is suggested that the ratio of the long to short radi of the ellipse is 3~5.

关 键 词：桥梁抗震 椭圆墩底隔震桥墩 滞回特性 拟静力试验 椭圆长半径 椭圆长短半径之比 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]