强震作用下钢筋混凝土连续梁桥倒塌分析  

Collapse analysis of RC continuous girder bridge under strong earthquakes

作　　者：李忠献[1] 陈宇[1] 李宁[1] 

机构地区：[1]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《地震工程与工程振动》2016年第1期35-43,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点基础研究发展"973"计划项目(2011CB013603);国家自然科学基金项目(91315301;51427901)~~

摘　　要：钢筋混凝土连续梁桥是广泛应用的桥梁结构形式,研究其在强震作用下的倒塌模式及规律对改进和完善工程抗震设计具有重要意义。本文应用有限元法建立了钢筋混凝土连续梁桥的简化数值模型,并分别通过钢筋混凝土空心薄壁桥墩,钢筋混凝土箱梁简化模型力学行为的对比试验,以及全桥简化模型与精细化模型动力特性的对比分析,验证了所建立全桥简化模型的可靠性;对不同支座强度的钢筋混凝土连续梁桥在强震作用下的倒塌过程进行了模拟,分析了桥梁结构的倒塌模式,研究发现支座强度对连续梁桥的倒塌模式有重要影响。The reinforced concrete （ RC ） continuous girder bridge collapse mode and collapse law under strong earthquake is great m is a widely used bridge form, and the research of eaningful to improve and perfect engineering anti- seismic design. This paper establishes a simplified numerical model of RC continuous girder bridge with finite ele- ment method. The simplified model is verified reliably by comparing the mechanical behavior of the RC hollow thin- wailed pier and RC box girder in experiments with numerical simulation, and comparing the dynamic characteristic of bridge with refinement finite element model. The collapse processes of a RC continuous girder bridge with various bearing strength under strong earthquakes are simulated, and the collapse modes of the bridge are analyzed. The results indicated that the beating strength has an important influence on the collapse modes

关 键 词：钢筋混凝土箱梁 空心薄壁桥墩 简化模型 连续梁桥 倒塌规律 倒塌模式 

分 类 号：TU352[建筑科学—结构工程] U442.5[建筑科学—桥梁与隧道工程]