钢管混凝土拱桥多振型组合pushover方法可行性例证  

Example verification of the feasibility of multi-modal pushover method for concrete-filled steel tube arch bridges

作　　者：曾森[1] 高龙涛 陈少峰[1] 王彩花 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150090 [2]大连市市政设计研究院有限责任公司,辽宁大连116011

出　　处：《土木工程学报》2016年第1期80-85,共6页China Civil Engineering Journal

基　　金：国家自然科学基金(51308157)

摘　　要：提出采用pushover方法估计钢管混凝土（CFT）拱桥的弹塑性地震响应。由于CFT拱桥地震响应受高阶振型影响较大,故pushover方法需要考虑多振型组合。在阐述了多振型组合的pushover方法的过程步骤后以潮白河大桥为例,对比了pushover方法和杆系模型弹塑性时程分析所得的增量动力时程分析（IDA）曲线。对比结果表明：考虑多振型组合pushover方法能合理的得到结构最大响应;所绘制的IDA曲线与弹塑性时程分析所得曲线很接近,可以用于工程实践;就该例而言,多振型组合结果误差比单一振型结果小10%～15%。In this study,a pushover method was proposed to estimate the elastic-plastic seismic response of concretefilled steel tube（ CFT） arch bridge. Since the seismic response of CFT arch bridge may be significantly affected by the high-order modes,the combination of multiple modals should be taken into account in the pushover method. Firstly,the application procedures of the multi-modal pushover method were elaborated. Then the Chaobai River Bridge was taken as an example,the incremental dynamic analysis（ IDA） curves obtained from the multi-modal pushover method and the elastic-plastic time-history analysis of tie-bar model of the bridge were compared. The comparison results show that the maximum response of the structure can be appropriately obtained by the multi-modal pushover method,and the IDA curves obtained by the multi-modal pushover method are close to those obtained by the elastic-plastic time-history analysis,indicating that the method can be applied to engineering practice. For the present example,it was found that the errors for multi-modal combination are 10% ～ 15% smaller than those for single modal.

关 键 词：拱桥 推覆分析 钢管混凝土 振型组合 增量动力时程分析 

分 类 号：U441[建筑科学—桥梁与隧道工程] U448.38[交通运输工程—道路与铁道工程]