钢框架梁柱节点力学性能研究

Mechanical behavior study on joint of steel frames

在美国的Northridge地震和日本阪神地震中,钢框架梁柱刚性连接节点发生严重的脆性破坏现象,显示出节点构造还不尽合理,需对其进行构造改进。文中提出三种改进方式,通过对改进后节点的有限元计算分析,结果表明:在反复荷载作用下,改进节点强度和刚度较好,能够满足我国抗震规范的要求;塑性铰外移,改善节点区的力学性能;加载到极限状态时,节点域变形很小,满足强节点弱杆件的抗震设计原则;且节点构造简单,易于工地现场施工。

Numerous rigid connections brittle fracture happened in the Northridge earthquake in America and Hyogoken-Nanbu earthquake in Japan, which indicate that cognitions on the damage mechanism of beam to column connection are rather inadequate. It need to improve in constitution. There are four kinds of connections are analyzed by the finite element. Under the repeat and direct load, which strength and rigidity of improved connections are better and can satisfy the request of code for seismic design of buildings;when load increased to ultimate load, the deformation of joint-panels is very slightly and can satisfies principles of general design method;the structure constitution style are simple and can be construct easily.