扁平钢箱梁U肋焊接残余应力数值模拟分析  

Numerical simulation for the residual stress of U-rib welding onto the flat steel box girder

作　　者：王若林[1] 李根森 

机构地区：[1]武汉大学土木建筑工程学院,武汉430072 [2]云南省电力设计院,昆明650224

出　　处：《土木建筑与环境工程》2015年第1期104-111,共8页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金(51278387)~~

摘　　要：已建成的扁平钢箱梁桥在运营过程中发现一些与结构、构造和制造相关的病害,并且随着服役时间的增长越来越突出。其原因是扁平钢箱梁结构采用薄板组焊而成,因此,扁平钢箱梁在未受力之前,便已存在着由于焊接所产生的应力场和变形场,导致扁平钢箱梁普遍出现裂纹等病害。运用热结构耦合法对扁平钢箱梁U肋与桥面板交接处焊接的温度场和应力场进行数值模拟计算分析,并得到焊接残余应力的分布规律,为进一步分析结构病害与加固设计提供依据。The flat steel box girder is commonly used for long-span cable-stayed bridges, the structural complexity, construction details and manufactures cause damage to the bridge and the damages seriously grow overtime. The main reason for these damages is that welding technology of flat steel box girder with thin plates and rib elements produces residual stress and strain fields during the welding process, and further more welding cracks commonly appear. In this study, thermal structural couple methods was adopted to numerically simulate the welding high temperature fields and the stress fields at the joint of U rid and decks of a flat steel box. The welding residual stress distribution was studied as well for further analyzing on the structural damage and strengthening design strategies.

关 键 词：扁平钢箱梁 焊接 残余应力 裂纹 数值模拟 

分 类 号：TU391[建筑科学—结构工程]