钢桥面板顶板-纵肋双面焊的焊接残余应力分析与统一分布模型  

Analysis and Unified Distribution Model of Double-Sided Welding Residual Stress of Steel Deck-Rib

作　　者：王喆 丁幼亮[1] 钟雯 耿方方[2] WANG Zhe;DING Youliang;ZHONG Wen;GENG Fangfang(Key Laboratory for Concrete and Pre-stressed Concrete Structures of Education of Ministry,Southeast University,Nanjing 210096,China;The Institute of Civil Engineering of Nanjing Institute of Technology,Nanjing 211167,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]南京工程学院建筑工程学院,南京211167

出　　处：《结构工程师》2021年第1期1-8,共8页Structural Engineers

基　　金：国家自然科学基金资助项目(51978154,51608258);江苏省杰出青年基金项目(BK20190013)。

摘　　要：通过有限元软件建立钢桥面板顶板-纵肋双面焊焊接节点模型,对双面焊焊接残余应力进行了数值模拟,得到其残余应力分布图,并分析双面焊焊接残余应力随板件厚度的变化规律。分析结果表明,双面焊横向残余应力在焊缝侧顶板表面的外侧焊缝焊趾处达到最大值250 MPa;纵向残余应力在焊缝侧顶板表面的内侧焊缝焊根处达到最大值445 MPa,已超过材料的屈服强度。横向残余应力在不同板件厚度下差别较大,顶板厚度为12 mm时的横向残余应力比顶板厚度为20 mm时小40%;而纵向残余应力变化不明显。通过分析模拟结果,建立了双面焊焊接残余应力统一分布模型,有助于进一步研究双面焊钢桥面板疲劳性能。Finite element software is used to establish a double-sided welding joint model of steel deck-ribs,and residual stress of the double-sided welding is numerically simulated.This paper obtain the residual stress distribution of double-sided welding,and analyze the distribution law of double-sided welding residual stress for plates with different thickness.The results show that the transverse residual stress reaches a maximum of 250 MPa at the weld toe of outer weld of weld side surface;the longitudinal residual stress reaches a maximum of 445 MPa at the weld roof of inner weld of weld side surface,which exceeds the material yield strength.The transverse residual stress is quite different under different plate thickness,and the transverse residual stress when the thickness of top plate is 12 mm is 40%smaller than the one with a top plate thickness of 20 mm;the change of longitudinal stress is not obvious.According to the simulation results,the unified distribution model for double-sided welding residual stress is established,which is helpful for further study of fatigue properties of double-sided welded steel bridges.

关 键 词：钢桥 双面焊 焊接残余应力 板件厚度 统一分布模型 

分 类 号：U445.583[建筑科学—桥梁与隧道工程]