铰接隅撑钢框架抗震性能研究  

A Study on Seismic Behavior of Hinged Gusset Steel Frame

作　　者：李萍[1] Li Ping(Xi'an Railway Vocational and Technical Institute,Xi'an,Shaanxi 710600,China)

机构地区：[1]西安铁路职业技术学院,陕西西安710026

出　　处：《西安轨道交通职业教育研究》2023年第1期5-14,共10页Xi'an Rail Transit Vocational Education Research

摘　　要：传统抗弯钢框架的梁柱节点通常设计为刚性连接,这种刚性节点具有很大的抗弯刚度,然而节点延性不足,罕遇地震作用导致节点脆性断裂。研究学者提出了多种解决该问题的思路,例如半刚性连接节点、节点加强或削弱方法使塑性铰外移等。本文提出了一种简化的梁柱节点连接方式——铰接连接,改变梁柱节点的传力方式,在节点处设置隅撑提供框架的抗侧刚度,控制结构的失效模式。本文设计了三组抗弯钢框架和铰接隅撑钢框架,分别为3层、5层和8层结构,通过Pushover分析和非线性动力时程分析,对比二者之间的承载力、刚度、延性、层间侧移等抗震性能。研究结果表明:铰接隅撑钢框架具有和传统抗弯钢框架相似的抗侧刚度,且承载能力略高。罕遇地震作用下,铰接隅撑钢框架的层间侧移较小。传统抗弯钢框架失效模式为梁端出现塑性铰,而铰接隅撑钢框架的塑性区域转移至隅撑与梁连接部位。The beam column joints of traditional flexural steel frames are usually designed as rigid connections.This kind of rigid joints have great flexural stiffness.However,the ductility of the joints is insufficient,and the brittle fracture of the joints is caused by rare earthquake.Researchers have put forward a variety of ideas to solve this problem,such as semi-rigid connection joints,joint strengthening or weakening methods to move the plastic hinge outward,and so on.This paper presents a simplified connection mode of beam column joints-hinged connection,which changes the force transmission mode of beam column joints,sets corner braces at the joints to provide the lateral stiffness of the frame and control the failure mode of the structure.In this paper,three groups of flexural steel frames and hinged gusset steel frames are designed,which are 3-story,5-story and 8-story structures respectively.Through pushover analysis and nonlinear dynamic time history analysis,the seismic properties such as bearing capacity,stiffness,ductility and story drift between them are compared.The results show that the hinged gusset steel frame has the same lateral stiffness as the traditional bending steel frame,and the bearing capacity is slightly higher.Under rare earthquake,the story drift of hinged gusset steel frame is small.The failure mode of traditional bending steel frame is plastic hinge at the beam end,while the plastic area of hinged corner brace steel frame is transferred to the connection between corner brace and beam.

关 键 词：隅撑钢框架 抗弯钢框架 失效模式 层间侧移 

分 类 号：TU352.11[建筑科学—结构工程]