建筑钢箱梁节段接口环缝焊接变形研究

RESEARCH ON CIRCUMFERENTIAL SEAM WELDING DEFORMATION OF BUILDING JOINTS OF STEEL BOX GIRDER SECTIONS

南淝河大桥钢箱梁为全焊接结构,箱梁断面宽度较大,采用钢材厚度较薄。另外,桥位箱梁的环缝焊接为野外作业环境,给环形焊接收缩、变形和质量控制带来难度。环缝焊接的质量决定桥梁的安全性,为了保证桥梁的整体安全,控制焊接变形,对钢箱梁焊接和焊接变形控制进行分析,制定合理的焊接工艺流程,采取有效控制变形的措施。建立钢箱梁有限元模型,对环缝焊接变形进行预测,研究焊接顺序对环缝焊接变形的影响,利用MATLAB软件对不同焊接顺序下的钢箱梁顶板的平面度进行分析和评价。

Taking the steel box girder of the Nanfei River Bridgeas,which is an all-welded structure,and the width of the box girder is large,the thickness of the steel is thin.In addition,the circumferential seam welding of the bridge box girder is a field working environment,which makes it difficult to the ring welding shrinkage,deformation and quality.The quality of the circumferential seam welding determines the safety of the bridge.In order to ensure the overall safety of the bridge,the welding deformation was controlled,the steel box beam welding and welding deformation control were deeply analyzed,a reasonable welding process was established,and the measures for effectively controlling the deformation were taken.According to the finite element model of steel box girder,the deformation of circumferential seam welding was predicted.The influence of welding sequence on the deformation of circumferential seam welding was studied.The flatness of steel box girder roof in different welding sequences was analyzed and evaluated by MATLAB software.