考虑结构损伤的CFST拱桥极限承载力分析  

Analysis of Ultimate Load-bearing Capacity for CFST Arch Bridge with Consideration of Structure Damage

作　　者：钟正强[1] 刘剑[2] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410114 [2]中南林业科技大学土木工程与力学学院,湖南长沙410004

出　　处：《中国公路学报》2012年第1期95-100,共6页China Journal of Highway and Transport

基　　金：湖南省科技计划项目(2010GK3206)

摘　　要：为研究大跨度钢管混凝土拱桥在结构受到损伤情况下的极限承载力,以某特大桥为例,假定该桥在营运阶段主拱圈拱脚根部截面受到损伤,借助通用有限元程序ANSYS建立相应的空间有限元模型,研究过程中引入考虑套箍效应的钢管内混凝土本构关系,对该类桥型的拱脚关键部位损伤前后,在3种不同工况下极限承载力进行了对比分析,得出了相应的极限荷载系数、破坏模式以及荷载-位移曲线之间的关系。结果表明:在该类结构极限承载力分析过程中,非线性效应十分明显;关键部位的轻微损伤对该类结构的极限承载力有较为明显的影响,但不影响结构破坏的模式;在结构的极限承载力分析中,必须考虑几何与材料的双重非线性特性的影响。In order to research the ultimate load-bearing capacity of long-span CFST arch bridge with structure damage,in the case of certain large bridge,it was assumed that the arch foot section of main arch rib was damaged in service stage,ANSYS finite element program was used to establish its spatial finite element model.The constitutive relation of concrete with confined effect was introduced.Before and after the vital section of arch foot was damaged,ultimate load-bearing capacities under three different operating conditions were studied.Relations of the respective ultimate load coefficients,failure modes and load-displacement curves were drawn.Results show that nonlinear effect of this certain type structure is evident during analysis process of ultimate load-bearing capacity.The minor damage of vital section has obvious impact on the ultimate load-bearing capacity of this certain type structure,but it will not affect the failure mode of the structure.In analysis of the ultimate load-bearing capacity of the bridge structure,the effect of geometry and material double nonlinearity can＇t be neglected.

关 键 词：桥梁工程 钢管混凝土拱桥 有限元模型 结构损伤 双重非线性 极限承载力 

分 类 号：U448.225[建筑科学—桥梁与隧道工程]