配置低屈服点角钢连接件的钢框架节点损伤控制及优化设计  

Damage control and optimal design of steel frame connection with low yield point angle steel components

作　　者：王萌[1] 孙毅 杨璐 WANG Meng;SUN Yi;YANG Lu(College of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;The Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Centre of High-Rise and Large-Span Prestressed Steel Structures,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [3]北京工业大学北京市高层和大跨度预应力钢结构工程技术研究中心,北京100124

出　　处：《建筑结构学报》2021年第12期76-89,共14页Journal of Building Structures

基　　金：国家自然科学基金项目(51778042);北京市自然科学基金项目(8182042)。

摘　　要：为实现结构损伤控制以及震后可快速恢复,提出一种配置可更换低屈服点角钢连接件的钢框架节点。采用ABAQUS有限元软件建立连接节点数值分析模型,并采用典型试验结果进行验证。利用上述数值分析模型,建立不同削弱策略、不同连接件材料的节点模型,优选损伤控制模式。然后,通过建立不同削弱程度、不同连接件耗能段长度的节点模型,分析这2个参数对角钢连接节点抗震性能以及结构保险丝功能的影响,并提出设计建议。研究结果表明:采用低屈服点钢材的连接件,耗能占各部件总耗能比例可达95%,有效保护主体结构,保证节点延性。综合考虑加工难度、耗能比例、结构保险丝功能和材料利用率等,配置角钢薄腹板削弱策略是优选解决方案。随着削弱程度的增加,角钢连接件塑性变形和耗能比例逐渐增加,结构保险丝功能有效提高;随着耗能段长度的增加,角钢连接件耗能比例增大,说明此措施能够在不过度削弱节点承载能力的情况下有效保护主体结构;但当耗能段超过1.0倍梁宽时,耗能段屈曲变形明显,影响节点延性,同时耗能提高不明显。因此,在控制设计承载力系数不超过1.0,适当增加耗能段长度(不超过1.0倍梁宽),可有效提高结构保险丝作用效果。A replaceable steel frame connection with low yield point(LYP)angle steel components is proposed for realizing structural damage control and quick recovery after earthquakes.Numerical models of connections were established using finite element software ABAQUS and the accuracy and applicability were verified using typical test results.Based on the verified numerical method,models with various weakened degrees and different materials of angle steel components were established,and optimal damage control configuration was selected.Then,models with different weakened degrees and different free deformation lengths of the web of angle steel were established.The influence of the two parameters on the seismic behavior and the function of structural fuses was discussed,and some design suggestions were proposed.The analysis results show that the LYP steel angle components can dissipate 95%of the system energy,effectively protect the primary structure and ensure the ductility of connections.Considering the manufacturing difficulty,energy dissipation ratio,structural fuse function and material utilization rate,the connection with thin web angle steel components is a feasible solution.With the increase of the weakened degree,the plastic deformation and energy dissipation proportion of angle steel components increase,indicating the structural fuse function is effectively enhanced.With the increase of the free deformation length,the energy dissipation proportion of the angle steel component increases,revealing that this measure can effectively protect the main structure without excessively reducing the connection strength.However,when the free deformation length exceeds the width of the beam,the out-of-plane buckling is obvious,which adversely affects the ductility of the connection,while the enhancement of energy dissipation prportion is not obvious.Therefore,based on reasonable design bearing capacity coefficient(not exceeding 1.0),appropriately increasing the free deformation length(not exceeding the width of the beam)can imp

关 键 词：钢框架节点 角钢连接件 低屈服点钢材 结构保险丝 损伤控制 

分 类 号：TU392.104[建筑科学—结构工程] TU352.11