狗骨式节点梁翼缘削弱深度的取值研究

RESEARCH ON THE CUTTING DEPTH OF THE BEAM FLANGE OF THE REDUCED BEAM SECTION CONNECTION

狗骨式节点能有效地将塑性铰从节点区域外移到梁上,增加节点延性,地震时起到保险丝的作用。理论分析表明,狗骨式节点梁翼缘削弱深度对狗骨式节点强度、延性及承载力都有明显影响。削弱深度过小不能有效地使塑性铰外移,削弱深度过大对结构承载力将产生不利影响。因此当削弱深度取值在合理范围内,才能有效改善节点抗震性能,提高钢框架节点的抗震能力。

Reduced beam section connection can move plastic hinge from frail joint to the beam,improving the ductility of the connection, and making reduced beam connection as the fuse in the earthquake. The theoretic analysis indicates that the cutting depth has obvious influence on the strength, ductility and bearing capacity of reduced beam connection. If the cutting depth is too small, the plastic hinge can＇t move outside efficiently;if the cutting depth is too large,it will have bad effect on the bearing capacity of project. Only when the cutting depth is in the reasonable range,can the seismic behaviour of the connection be improved, and the seismic ability of steel structure connection enhanced.