在役老旧拱桥的极限承载力分析  

Analysis of Ultimate Bearing Capacity of Aged Arch Bridge

作　　者：章和庆 丁勇[2] 郑小尧[2] 

机构地区：[1]宁波市城市管理局,浙江宁波315040 [2]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2009年第3期396-400,共5页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：中国与波兰政府间合作项目(33-18);浙江省自然科学基金(Y607563);浙江省教育厅科学项目(20070959)

摘　　要：在役老旧拱桥的承载力是人们关心的热点问题之一,某些桥梁随着使用年限的不断增加,拱肋以及其他结构部件变形甚至破坏,其承载能力削弱问题会变得尤为突出.以宁波市灵桥为例详细分析了其极限承载力,分析过程中考虑了材料和几何双重非线性,以及涉及到灵桥由于战争、船体碰撞、行车事故和其他意外事故引起的拱肋变形和扭曲情况.计算结果表明:拱肋面外的初始变形极大地削弱了灵桥的极限承载能力;要准确评估该桥的极限承载能力,必须考虑材料非线性和几何非线性的影响.The ultimate bearing capacity （UBC） of aged arch bridge in service has raised users＇ concerns and attracted technical attention. As bridge ages, the arch or other structural components may be distorted or damaged, and the UBC is thus compromised. In this paper, the UBC of Ling bridge in Ningbo is analyzed as the study case. Both geometric and material nonlinearity are primarily considered in analysis, along with the distortion of bridge arch caused by war, vessel impacts, vehicle loading, and other accidental factors. The computational results reveal that the normal deformation of arch attenuates the UBC apparently. Also found is that both material nonlinearity and geometrical nonlinearity are two principal factors and must be incorporated in the analysis concerned.

关 键 词：旧桥 极限承载力 拱肋变形 有限元方法 

分 类 号：TU997[建筑科学—市政工程]