首页> 中文期刊>西安建筑科技大学学报(自然科学版) >钢框架加强型梁柱连接的抗震机理研究

钢框架加强型梁柱连接的抗震机理研究

     

摘要

钢框架结构在强烈地震荷载作用下,传统的栓焊连接(或全焊连接)节点表现出大量的脆性破坏,迫使人们重新认识钢结构的抗震性能,并探究具有良好抗震性能的梁柱刚性连接形式.本文考虑了对梁柱连接局部加强的方法来提高节点承载力和转移塑性铰位置的几种连接形式,通过低周反复荷载试验进行了验证.发现这种加强型梁柱连接虽然在地震荷载作用下对承载力的提高并不明显,但可以保证有效地将塑性铰外移,大大提高节点的延性,从而加强了节点的耗能能力,达到避免节点脆性破坏的目的.在此基础上,对加强型梁柱连接在地震荷载作用下的内力传递、变形发展和塑性铰外移的过程进行了深入的理论分析,揭示了加强型梁柱连接的抗震工作机理.%Under intense seicmic loading, brittle failure usually occurs in steel moment-resisting frames with traditional bolt-welded connections or full-welded connections.Then people are forced to be aware of the seismic performance of steel structures.And new forms of rigid beam-column connections with good seismic behavior have to be explored.In this paper, several kinds of beam-column connections with local reinforcement are employed to improve the bearing capacity of nodes and transfer the location of plastic hinges, which have been verified through low-cyclic reversed loading test.It is shown that although the increase of the bearing capacity of the reinforced beam-column connection is not obvious under seismic loading,it is sure that the plastic hinge can be effectively relocated and the ductility of the node can be greatly enhanced.Therefore, energy dissipation capability of the node can be improved, and brittle failure can be avoided in the node.Based on test results, further theoretical analysis of internal forces transmission, deformation development and the process of outward relocation of plastic hinge of the reinforced beam-column connections under seismic loading are carried out and the aseismic mechanism of reinforced beam-column connections is revealed.

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