国产Q460高强钢焊接T形截面残余应力分布试验研究  

Experimental Study on Residual Stress in Welded T-section Using Domestic Q460 High Strength Steel

作　　者：熊晓莉[1] 王田 谌磊 XIONG Xiaoli;WANG Tian;CHEN Lei(College of Civil Engineering.Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]河南工业大学土木工程学院,郑州450001

出　　处：《建筑钢结构进展》2021年第9期42-53,共12页Progress in Steel Building Structures

基　　金：国家自然科学基金(51308194);河南省科技攻关项目(212102310562)。

摘　　要：残余应力是影响钢压杆整体稳定承载力的重要缺陷因素之一。为获得合理的国产Q460高强钢焊接T形截面残余应力分布模型,采用锯割法对不同截面尺寸的8个试件进行残余应力试验研究。根据实测数据,绘制各截面的残余应力分布图,研究板件宽厚比、板件厚度对残余应力大小及分布宽度的影响,组成截面各板件间的相关性及残余应力的自平衡性。分析结果表明:焊缝处残余拉应力大小与板件厚度及板件宽厚比无关,相应的分布宽度与板件厚度及板件宽厚比成反比;板件外伸段中部的残余压应力大小与板件厚度和板件宽厚比成反比,相应的分布宽度与板件厚度和板件宽厚比无关;各板件内的残余应力能够分别满足自平衡条件,且全截面上的残余应力也能满足自平衡条件。基于上述分析结果,提出能够准确描述试验结果的国产Q460高强钢焊接T形截面残余应力分布模型,并进行有限元分析验证,为后续焊接T形截面钢压杆整体稳定承载力的研究提供重要参考。Residual stress is an important initial imperfection for the buckling behavior of steel compressive members.An experimental investigation was carried out to quantify the impact of residual stress on welded T-section using domestic Q460 high strength steel.The residual stresses of eight specimens with various dimensions were measured by using the splitting method.Based on the experimental data, the magnitude and distribution of both compressive and tensile residual stresses in the whole section were obtained.The research was focused on the factors affecting the magnitude and distribution of residual stresses, such as plate thickness, width-thickness ratio, the interaction between flange and web, and the self balance of residual stress.It was found that the magnitude of tensile residual stresses near the weld was hardly correlated to the sectional dimension, but the distribution width was inversely proportional to the plate thickness and width-thickness ratio.Also, the magnitude of compressive residual stress in the flange was inversely proportional to the plate thickness and width-thickness ratio, but the distribution width was hardly correlated to the sectional dimension.Moreover, there was no interaction between flange and web since the total residual stress was close to zero within each individual plate.According to above conclusions, a distribution model was proposed, which had an accurate description of the experimental results.Meanwhile, the model was verified using finite element analysis, and can be presented as a reference for the future analysis on the overall buckling of welded T-section compressive members.

关 键 词：国产Q460高强钢 焊接T形截面 残余应力 试验研究 分布模型 有限元分析 

分 类 号：TU391[建筑科学—结构工程]