铝合金箱形柱-H形梁节点焊接数值模拟  

Welding Numerical Simulations of Joints Between Aluminum Alloy Box Columns and H-Shaped Beams

作　　者：李成华[1] 郭帅 杨凯元 LI Chenghua;GUO Shuai;YANG Kaiyuan(School of Civil&Architecture Engineering,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安工业大学建筑工程学院,西安710021

出　　处：《工业建筑》2023年第8期89-95,共7页Industrial Construction

基　　金：陕西省自然科学基础研究计划项目(2021JM-435)。

摘　　要：为研究6061-T6铝合金箱形柱-H形梁节点焊接残余应力的水平及分布规律,通过有限元软件建立盖板加强型梁柱节点、有柱横隔板普通梁柱节点以及无柱横隔板普通梁柱节点模型,采用间接热力耦合的方式对节点进行T形全熔透焊缝焊接数值模拟,并进行了有限元模型验证。结果表明,各节点梁翼缘对接焊缝与腹板对接焊缝的纵向焊接残余应力中间部位达250 MPa左右,而焊缝两端焊接残余应力趋于0 MPa;各节点焊缝横向残余应力均为中间受拉、两端受压,其中加强型节点沿梁柱翼缘对接焊缝两端的横向残余应力趋于0 MPa,然而普通节点峰值为240 MPa左右的压应力;加强型节点盖板角焊缝处的残余应力皆为拉应力,且整体焊接残余应力水平较低。整体结果表明,焊缝处产生的焊接残余应力值较大,腹板对接焊缝与梁柱翼缘对接焊缝处的焊接残余应力已经达到6061-T6铝合金的屈服强度,与此同时,各节点均出现梁上下翼缘向梁腹板方向内凹的残余变形。In order to study the welding residual stress level and distribution law of joints between 6061-T6 aluminum alloy box-columns and H-shaped beams,the finite element software was used to establish the models of beam-column joints reinforced with cover plates,ordinary beam-column joints with column diaphragms,and ordinary beam-column joints without column diaphragms.The indirect thermo-mechanical coupling method was used to carry out the numerical simulation of T-shaped fully penetrated weld welding of the joints,and the finite element model was verified.The results showed that the middle part of longitudinal welding residual stress of the beam flange butt weld and the web butt weld of each joint was about 250 MPa,and the welding residual stress at both ends of the weld tended to 0 MPa.The transverse residual stress of each joint weld was tensile in the middle and was compressed at both ends.The transverse residual stress of the strengthened joint butt weld along the beam-column flange tended to 0 MPa,but the peak value of the ordinary joint was about 240 MPa.The residual stresses at the fillet weld of the cover plate of reinforced joint were tensile stresses,and the overall welding residual stresses were low.The overall results showed that the welding residual stress generated at the weld was large,and the welding residual stress at the butt weld of the web butt weld and the beam-column flange butt weld had reached the yield strength of 6061-T6 aluminum alloy.At the same time,the residual deformation of the upper and lower flanges of the beam concave in the direction of the web of the beam occurred at each joint.

关 键 词：铝合金 梁柱节点 焊接 数值模拟 焊接残余应力 

分 类 号：TU395[建筑科学—结构工程]