Q460高强钢焊接箱形截面残余应力研究  

Investigation on residual stress in Q460 high strength steel welded box sections

作　　者：班慧勇[1] 施刚[1] 石永久[1] 王元清[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《建筑结构学报》2013年第1期14-21,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51078205)

摘　　要：为研究国产Q460高强钢焊接箱形截面的残余应力分布规律,采用分割法对6个不同截面尺寸的试件进行了试验研究。基于测量数据,得到了不同试件全截面残余应力分布,研究了板件宽厚比、板件厚度等几何尺寸对残余应力的影响以及测量过程中人为产生的误差、截面板件间残余应力的相互影响及自平衡性等。试验结果表明:残余压应力与截面尺寸直接相关,残余拉应力与截面尺寸关系不大;采用分割法测量时人为操作产生的误差很小;截面4块板件的残余应力能够分别满足自平衡条件。提出了适用于Q460高强钢焊接箱形截面的残余应力分布模型和计算式,该模型能够准确反映截面尺寸的影响,且与试验结果吻合良好。In order to investigate the residual stress in Q460 high strength steel welded box sections,an experimental program including 6 section specimens with various dimensions was described in which the sectioning method was employed.The residual stress distribution over the entire section was obtained through original data.The effects from the plate width-thickness ratio and plate thickness as well as the human error and interaction between component plates were clarified.It is indicated that the compressive residual stress is correlated with sectional dimension while the tensile one has no clear relation with the sectional dimension.The human error of measurements is quite small,and residual stress equilibrium within each component plate is found.Finally,a distribution model and calculation formulae were established which took into account the effects from sectional dimensions and had a good agreement with test results.

关 键 词：钢结构焊接箱形截面 Q460高强度钢材 静力试验 残余应力分布模型 

分 类 号：TU391[建筑科学—结构工程] TU317.1