您现在的位置:建筑结构>> 期 刊>> 2019年>> 第02期>>正文内容
盲孔法测量热轧角钢截面残余应力及方差分析*
张鑫1,刘海锋2,韩军科2,郑宏1
摘 要

(1 北京工业大学建筑工程学院, 北京 100124; 2 中国电力科学研究院有限公司, 北京 100055)

[摘要]残余应力是影响钢结构受压稳定、疲劳断裂、脆性破坏和应力腐蚀开裂的一种不可避免的初始缺陷。为研究不同强度等级等边热轧角钢截面纵向残余应力分布,采用盲孔法对L110×8,L110×10,L160×12,L160×16共4种截面规格的Q235,Q345及Q420共计36个角钢试件的残余应力进行试验测量,得到了每个试件纵向残余应力的数值大小和分布范围。考虑到残余应力试验数据离散性较大,采用方差分析研究了角钢的肢边缘与肢背处残余应力分布及试件宽厚比、强度等级对残余应力系数的影响。分析结果表明:角钢各肢的残余应力分布关于肢中心对称,角钢的肢边缘与肢背处残余压应力大致相等;试件宽厚比和强度等级对残余应力系数没有显著影响,给出了描述试验结果的残余应力分布模式和建议峰值。

[关键词]盲孔法; 热轧角钢; 残余应力; 方差分析; 分布模式

中图分类号:TU973+.13文献标识码:A文章编号:1002-848X(2019)02-0097-06

 

Measurement of residual stress and variance of section of hot rolled angle steel by blind hole method

Zhang Xin1, Liu Haifeng2, Han Junke2, Zheng Hong1

(1 College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China;2 China Electric Power Research Institute Co., Ltd., Beijing 100055, China)

Abstract:Residual stress is one of the inevitable initial imperfections for the  compression stability of steel structure, fatigue failure, brittle failure and stress corrosion cracking. To investigate the longitudinal  residual stress distribution in  different strength grade equal-leg hot-rolled steel angle section, an experimental study of the residual stress of 36 specimens, including 4 types of sections:L110×8, L110×10, L160×12, L160×16 and 3 types of strength grade: Q235, Q345 and Q420, was conducted using blind hole method. And  the magnitude and distribution of longitudinal residual stress were obtained. Considering the great discreteness of testing data, the residual stress distribution of steel angle back and edgeand  the effect of width-thickness ratio and  strength grade on residual stress coefficient  were studied using variance analysis. Results show that the residual stress distribution on each limb of  the steel angle is symmetric with respect to the limb center. And the compressive residual stress of steel angle back is approximately equal to the stress of steel angle edge. The residual stress coefficient is hardly correlated to the width-thickness ratio and strength grade. Moreover, a distribution pattern and proposed peak to predict the residual stress were given, which well described the experimental results.

Keywords:blind hole method; hot-rolled steel angle; residual stress; variance analysis; distribution pattern

 

*国家自然科学基金项目(51408569)。

 

作者简介:张鑫,硕士,Email:247080791@qq.com。

下载地址

    你还没注册?或者没有登录?这篇论文要求至少是本站的注册会员才能阅读!

    如果你还没注册,请赶紧点此注册吧!

    如果你已经注册但还没登录,请赶紧点此登录吧!