梁腹板削弱式刚性钢框架抗震性能研究

根据钢框架强柱弱梁的抗震设计原则,按照有效控制梁上塑性铰位置的思路,对在梁腹板上进行开孔削弱的节点形式,通过开孔位置和大小的设计,控制节点处塑性铰形成的位置,进行三维有限元模拟分析,并将削弱位置和尺寸不同的节点构造形式与传统的梁柱节点进行对比分析。ANSYS模拟结果表明,采用腹板开孔的形式能大大缓解节点的应力状态,改善节点的延性性能,降低节点发生脆性破坏的可能性,提高结构的抗震性能。

Anti-seismic performance testing of new beam-to-column connections in steel frames

According to the principles of antiseismic design of steel frames-strong columns and weak beam, based on the idea of controlling the position of plastic hinges of beams effectively, the node form weakened by holed on the web is adopted, and the position of plastic hinges is controlled by the position and size of the holes. 3 D finite element method is used, and the node form weakened compared with the traditional beam-to-column connections, and analysed by synthesis. Results shows that the structural form in which a hole is made on the web can alleviate the triaxial stress close to the node, reduce the possibility of fragility damage of the weld, thus improving the aseismatic capability of the structure.