摘要
以BS700对焊槽钢结构为研究对象,对其加工成型后的焊接残余应力分布规律及其影响因素进行研究。研究结果表明:对焊槽钢结构中的焊接残余应力分布以纵向残余拉应力为主,会严重影响对焊槽钢结构的稳定性和疲劳性能;两条焊缝的纵向残余应力分布虽然均处于拉应力区域,第2条焊缝焊趾处的纵向残余应力峰值更高;在等截面边长结构中的截面边长变化和非等截面边长结构中的长宽比变化主要对对焊槽钢结构中的横向残余应力分布产生影响,对结构中的纵向残余应力分布影响不大;槽钢壁厚的变化会显著影响结构中的横向、纵向焊接残余应力值,在槽钢尺寸设计过程中,应选取适当壁厚的槽钢,以减小焊接残余应力对对焊槽钢结构的影响。
The distribution law and influencing factors on welding residual stress of BS700 butt welding channel steel were researched in this paper. The results indicated that the stability and fatigue performance of butt welding channel steel could be seriously influenced by longitudinal residual stress,which was the major factor of welding residual stress in this structure. Longitudinal residual stress in two welds was tensile stress,and the peak stress in weld toe of second weld was higher than the first one. Cross-section length changing in uniform cross-section length structure and the change of cross-section length-width ratio in unequal cross-section length structure mainly influenced horizontal residual stress distribution of butt welding channel steel,while had little impact on longitudinal residual stress distribution. The change of wall thickness had an obvious impact on the horizontal and longitudinal residual stress,thus proper wall thickness should be chosen during the design process in order to decrease the influence of welding residual stress on butt welding channel steel.
出处
《钢结构》
北大核心
2017年第3期47-51,65,共6页
Steel Construction
基金
国家重点基础研究发展计划(973计划)项目(2014CB046801)
理工大学野战工程学院青年基金项目(lgdgyy012)
关键词
BS700
对焊槽钢
焊接残余应力
分布规律
影响因素
BS700
butt welding channel steel
welding residual stress
distribution law
influencing factor
