不同焊接工况焊接效应对箱板装配式钢结构加劲墙板的影响

Influence of Welding Effect in Different Welding Conditions on Stiffened Wallboards of Prefabricated Box-Plate Steel Structures

通过ABAQUS关联DFLUX热源子程序对Q235B与Q345B钢板进行焊接模拟,并利用超声波检测方法对钢板进行焊接残余应力测试。试验发现:在焊缝热影响区上的纵向残余应力以拉应力为主,在整个焊件上横向残余应力既存在拉应力又存在压应力,且试验结果与模拟结果基本吻合,验证了ABAQUS模拟钢板焊接的可靠性。采用相同模拟方法对加劲钢板墙焊接过程进行模拟并对其焊接残余应力、焊接变形以及抗剪承载力进行分析。结果表明:加劲钢板墙的焊接残余应力与焊接变形主要发生在加劲肋与墙板焊缝处,沿焊缝方向上的残余应力均呈现上下两端小、中间大的特点;间断焊接对加劲钢板墙的高残余应力以及整体残余变形影响明显低于连续焊接;在所有焊接工况中,最小极限抗剪承载力与最大极限抗剪承载力相比下降了6.8%;对比所有工况后发现间断距离较大的焊接工况效果更好。

The welding simulations of Q235B and Q345B steel plates was conducted by ABAQUS associated DFLUX heat source subroutine,and the welding residual stress test of steel sheets was conducted by ultrasonic detection method.It was found that tensile stress was the main longitudinal residual stress in the heat-affected zone of the weld,and there was tensile stress and compressive stress in the transverse residual stress in the whole welding specimens.The test results were basically consistent with the simulation results,which verified the reliability of simulating welding of steel sheets.Using the same simulation method,the welding process of stiffened steel wallboards was simulated,and the residual stress,welding deformation,and shear capacity were analyzed.The results showed that the welding residual stress and welding deformation of the stiffened steel wallboard mainly occurred at the welding seam between the stiffening rib and the wallboard,and the residual stress along the welding seam direction was small at the upper and lower ends and large in the middle.The influence of discontinuous welding on high residual stress and overall residual deformation of stiffened steel wallboards was obviously lower than that of continuous welding.In all welding conditions,the minimum ultimate shear capacity decreased by 6.8%compared with the maximum ultimate shear capacity.After comparing all working conditions,it was found that the welding condition with a larger discontinuity distance had a better effect.