公路减隔震桥梁的地震反应简化分析  

Simplified analysis on seismic response of seismically isolated highway bridges

作　　者：李闯[1] 叶爱君[1] 余茂峰 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]浙江省交通规划设计研究院,浙江杭州310006

出　　处：《哈尔滨工程大学学报》2014年第11期1339-1344,共6页Journal of Harbin Engineering University

基　　金：国家973计划资助项目(2013CB036302);国家自然科学基金资助项目(51278375)

摘　　要：采用单自由度反应谱方法对满足一定条件的减隔震桥梁进行地震反应分析可以简化计算过程,但需要解决精度问题。针对规范反应谱阻尼修正方法对计算精度的影响进行了分析并提出了改进方法。为了验证改进方法的合理性,对一座常规减隔震桥梁分别采用不同计算方法进行了比较分析,结果表明采用改进的阻尼修正公式后,简化反应谱方法的计算精度得到很大提高,且结果偏于安全。When using the single-degree-of-freedom （SDOF） response spectrum method to analyze the seisntic response of some isolated bridges, it can simplify the calculation process. However, it needs to improve the accuracy in engineering as well. In this paper, the effects of the modification method for response spectrum damping or computation accuracy are analyzed and improvements are proposed. Specially, the objective is to aim at the seismic design code for highway bridges. In order to verify reasonability of the improved method, different methods are used to analyze earthquake responses of a regular bridge with isolation bearings. The results indicated that based on the improved damping modification formula, the calculation precision of the simplified SDOF response spectrum method is greatly increased and the computational results are safer.

关 键 词：公路桥梁 地震反应 减隔震设计 单自由度反应谱法 阻尼修正方法 

分 类 号：TU311.3[建筑科学—结构工程]