苏州火车站站房钢结构复杂节点设计研究

苏州火车站屋盖结构采用空间菱形大跨度钢管桁架结构,局部为双向交叉菱形桁架。桁架汇交杆件数量多、直径大,节点构造非常复杂。工程节点主要采用相贯焊接的形式,受力集中和几何构型非常独特的部位采用铸钢节点。焊接节点域进行局部加厚,并在主通弦杆内部设置环形加劲肋,以提高节点承载力。铸钢节点域根据构件的几何尺寸与空间关系确定主通杆件与加劲肋的设置方式,采用渐变壁厚的方式满足受力平衡过渡以及铸造工艺的要求,并在构件端口设置构造环肋以及反向焊接坡口解决与钢管的连接。通过有限元分析与试验研究对上述节点构造的合理性进行了全面分析,确保节点具有较大的安全储备。

Research and design about the complex joints of Suzhou Railway Station

The steel roof structure of Suzhou Railway Station is a large span spatial rhombic tube-truss structure and the truss intersects on the local scale.The joints are very complex because many members joint together and the diameter is big.The members are welded directly to each other at most joints and some complex joints which bear giant forces and have complex geometry using cast-steel joint.The welded joints are thickened and the hoop stiffeners are set in the main chord member,which can improve the bearing capacity of joints.The main member and the stiffeners are determined according to the geometry size and space relation on the cast-steel joints.In order to satisfy the cast techniques and equilibrium transition,the tube wall thicken gradually,the hoop stiffeners and welding beveled edges are set at the end of members.In order to have enough safety margin,finite element analysis and experimental study have been done on the joints.