L型钢板-橡胶加固铁路重力式桥墩的抗震性能研究  

Study on seismic performance of railway gravity piers strengthened with L-model steel plate and rubber

作　　者：张琳 陈兴冲[1] 刘正楠[1] Zhang Lin;Chen Xing-chong;Liu Zheng-nan(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《工程抗震与加固改造》2022年第6期85-91,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(51968039);天津大学-兰州交通大学自主创新基金(2021058)。

摘　　要：为探究L型钢板-橡胶加固铁路重力式桥墩的抗震性能,对1个未加固桥墩模型和1个采用L型钢板-橡胶加固的桥墩模型开展拟静力试验,分别分析其在循环往复荷载作用下承载力、滞回性能、刚度退化以及耗能的变化规律,通过对比抗震加固前后桥墩破坏形态及抗震性能的差异,评价新型耗能装置的加固效果。研究结果表明:采用L型钢板-橡胶加固能抑制墩底区域裂缝的发展,实现破坏面不发生转移。桥墩经加固后,水平承载力提高了12.6%,初始刚度提升了11.1%,累积耗能提升了48.3%,表现出良好的抗震性能。To explore the seismic performance of railway gravity piers strengthened with L-model steel plate and rubber, quasi-static tests are carried out on an unstrengthened bridge pier model and a bridge pier model strengthened with L-model steel plate and rubber. The change laws of bearing capacity, hysteresis performance, stiffness degradation and energy dissipation under cyclic loading are analyzed respectively. By comparing the difference of failure modes and seismic performance of piers before and after seismic strengthening, the strengthening effect of the new energy dissipation device is evaluated. The results indicate that the L-model steel plate and rubber can restrain the development of cracks at the bottom of the pier and achieve no transfer of the failure surface. After the pier is strengthened, the horizontal bearing capacity, initial stiffness and cumulative energy consumption of the pier are increased by 12.6%, 11.1% and 48.3% respectively, showing good seismic performance.

关 键 词：重力式桥墩 L型钢板-橡胶加固 耗能 拟静力试验 

分 类 号：U24[交通运输工程—道路与铁道工程]