负载下焊接加固钢柱截面应力分布有限元分析  

Finite Element Analysis on Stress Distribution on Section of Steel Columns Reinforced by Welding under Load

作　　者：王元清[1] 祝瑞祥[2] 戴国欣[2] 施刚[1] 

机构地区：[1]土木工程安全与耐久教育部重点实验室,清华大学土木工程系,北京100084 [2]重庆大学土木工程学院,重庆400045

出　　处：《沈阳建筑大学学报（自然科学版）》2013年第4期577-583,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家十一五科技支撑计划重大项目(2006BAJ03A02)

摘　　要：目的分析轴心受压钢柱在负载下进行焊接加固前后钢柱截面的应力分布,探寻负载大小对焊接加固后钢柱截面的应力分布影响.方法采用有限元软件ANSYS和焊接热力耦合分析的方法模拟钢柱在负载下焊接加固的过程,并获取各阶段钢柱截面的纵向应力分布.结果负载焊接加固后钢柱截面的应力分布发生了明显变化,产生了应力重分布,并随着初始负载逐渐增大,加固后钢柱新旧截面的应力重分布的趋势越来越明显.结论建议在分析负载下焊接加固钢构件的受力性能时不仅需要采用生死单元技术,同时还需用热力耦合的方法,这样才能更加准确地模拟加固施工中焊接的热过程.In order to analyze the stress distribution of cross section of axially loaded steel columns before and after welding-strengthening under load,and the influence of load size on stress distribution of steel column section after reinforced,the finite element software ANSYS and the analytical method of welding thermal-mechanical coupling have been used to simulate the process of welding reinforcement under load,then the longitudinal stress distribution of cross section of steel column of every phase was obtained.The results show that the stress distribution of cross section of steel columns change obviously after welding reinforcement under load,which is called stress redistribution.With the increase of initial load,the trend of stress redistribution between new and old section of reinforced steel column become more and more obvious.The technology of element birth and death and the method of thermal-mechanical coupling are all needed to be used in the analysis of mechanical behavior of steel members reinforced by welding while under load,only in this the simulation of welding thermal process of strengthening construction can be more accurate.

关 键 词：负载 焊接加固 钢柱 应力分布 有限元分析 

分 类 号：TU391[建筑科学—结构工程]