铁路标准桥梁典型减隔震体系响应行为与谱分析方法  

Seismic behavior of typical isolated standard railway bridges and appropriate spectrum analysis methods

作　　者：管仲国[1] 苏伟 李晓波 王雨权 国巍[3] Guan Zhongguo;Su Wei;Li Xiaobo;Wang Yuquan;Guo Wei(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;China Railway Design Corporation,Tianjin 300308,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]同济大学土木工程防灾减灾全国重点实验室,上海200092 [2]中国铁路设计集团有限公司,天津300308 [3]中南大学土木工程学院,长沙410075

出　　处：《东南大学学报（自然科学版）》2024年第5期1097-1104,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52278527);中国国家铁路集团有限公司科技研究开发计划资助项目(K2022G009).

摘　　要：基于铁路标准桥梁3种典型减隔震设计体系,分析了结构的地震响应行为,重点研究了墩身质量的动力效应和减隔震体系的振型效应.结果显示:铁路标准桥梁墩身质量对桥墩的地震响应存在显著的动力效应,忽视该效应会导致墎顶位移和墎底弯矩的平均相对误差约达11%~32%,对主梁的地震位移影响较小,平均相对误差不超过5%;桥墩的地震响应主要受计算方向上的前2阶振型控制,其中第2阶振型以桥墩自振形态为主,振型阻尼可偏于安全地按结构阻尼比考虑;基于2阶振型效应的SRSS组合可以较好地考虑减隔震铁路标准桥梁的墩身质量动力效应,其预测墩底弯矩平均相对误差可下降至7.5%;AASHTO规范建议的多振型反应谱法适用于铁路标准桥梁典型减隔震体系的地震响应分析.Based on three typical isolation systems,the structural seismic behavior of isolated standard railway bridges is primarily investigated with emphasis on dynamic effects of the pier mass and the influence of modes.The results show that the pier mass of standard railway bridges has a significant dynamic effect on the seismic response of piers.If the effect is ignored,the average relative error of pier top displacement and base bending moment reaches about 11%to 32%.But the influence on the displacement response of the girder is quite small with an average relative error no more than 5%.The seismic responses of the bridge pier of an isolated standard railway bridge is dominated by the first two modes in the analyzed direction.The second mode is characterized by vibration of the pier and its damping ratio can be safely considered in terms of the structural damping ratio.A SRSS combination of the responses of the first two modes could appropriately consider the dynamic effects of the pier mass and reduce the average relative error of the predicted base bending moment to 7.5%.Moreover,the multi-modes spectrum analysis method proposed by the AASHTO guidance is suitable for seismic analysis of typical isolated standard railway bridges.

关 键 词：铁路标准桥梁 摩擦摆减隔震支座 钢阻尼器 桥墩质量动力效应 谱分析方法 

分 类 号：P315.9[天文地球—地震学]