钢箱-桁架梁K型整体节点焊接残余应力的有限元分析
Finite element analysis on welding residual stresses ofintegral K-joints for steel box-truss bridge

以新型钢箱-桁梁桥下弦杆K型整体节点为研究对象，采用ANSYS软件建立K型整体节点焊接的热力学有限元模型，根据实际焊接工艺及施焊顺序，采用生死单元法模拟焊接热源加载和冷却过程，开展节点焊接残余应力的数值模拟分析，得出的焊接残余应力分布规律与缩尺模型试验实测结果吻合较好。钢箱-桁梁桥K型整体节点焊接残余应力的有限元分析结果表明，腹板对焊处形成最大焊接残余应力区域，节点与腹杆对接部分所受影响较小。
An integral K-joint in new steel box-truss bridge was selected as the study object, and finite element thermal-structural model was established using the software ANSYS. The numerical simulation of welding residual stresses was analyzed during the welding and cooling process by adopting the element birth-death technology, according to the welding procedure and order in practical engineering. The welding residual stress distribution of integral K-joint drawn from finite element analysis agrees well with the results of reduced scale model test. The finite element analysis of prototype integral K-joint in steel box-truss bridge indicates that the highest welding residual stresses is located adjacent to the butt weld area of web, while the parts of K-joint connected with web members are less influenced