摘要
焊接是钢结构制作和施工过程中最常用的连接技术之一。焊接残余应力会导致结构变形和刚度降低,影响结构安全和施工质量,采用数值模拟方法预测大型钢结构的焊接残余应力对确定焊接工艺以及设计强度校核均具有重要意义。采用串形热源模型,以天津高银117大厦巨型转换桁架为研究对象,研究了转换桁架斜腹杆焊接拼装顺序对转换桁架焊接接头残余应力和转换桁架结构整体焊接残余内力的影响,对确定实际焊接施工顺序和工艺起到了定量指导作用。
Welding is one of the most widely utilized techniques nowadays in the fabrication and installation of steel structures. However,residual stress caused by welding would reduce the structure stiffness and change its initiate structural distortions thus affecting the overall construction quality and structure safety. Therefore,it is very significant to predict residual stresses and thus residual distortions on large-scale steel structures by numerical simulations and experimental studies. The method based on chained heat resource is applied in the on-site assembling and welding process of the giant transfer truss in Tianjin Gaoyin 117 project. The results obtained help to determine the construction welding sequence of the web members which significantly affects the welding residual stresses of the transfer truss.
出处
《施工技术》
CAS
北大核心
2016年第14期1-8,16,共9页
Construction Technology
关键词
钢结构
巨型转换桁架
焊接
残余应力
数值模拟
steel structures
giant transfer truss
welding
residual stresses
simulation
作者简介
郭彦林，教授，博士生导师，E-mail：gyl@tsinghua．edu．cn
