扩孔螺栓连接型耗能段力学性能试验研究  

Experimental study on the mechanical property of very short shear link with shear slotted bolted connection

作　　者：张波 贾益纲[2,3] 刘超 吴光宇[2,3] 李大浪[1] 胡淑军 ZHANG Bo;JIA Yigang;LIU Chao;WU Guangyu;LI Dalang;HU Shujun(China Nerin Engineering Co.,Ltd.,Nanchang 330031,China;Design and Research Institute,Nanchang University,Nanchang 330001,China;School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]中国瑞林工程技术股份有限公司,江西南昌330031 [2]南昌大学设计研究院,江西南昌330001 [3]南昌大学工程建设学院,江西南昌330031

出　　处：《地震工程与工程振动》2024年第2期116-125,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51908268,51268044);江西省自然科学基金项目(20224BAB204062)。

摘　　要：扩孔螺栓连接型耗能段由短剪切型耗能段和剪切扩孔型螺栓连接组成,可有效地提高耗能段的延性和耗能能力,并减小耗能段损伤,由此提高偏心支撑结构震后功能恢复能力。分别设计1个短剪切型耗能段、3个考虑摩擦滑移的扩孔螺栓连接型耗能段、1个普通扩孔螺栓连接型耗能段试件,并进行低周往复加载研究,得到其变形或破坏模式、滞回曲线、骨架曲线和力学模型等。试验结果表明,扩孔螺栓连接型耗能段先后经历摩擦滑移和耗能段承载2个过程,且破坏模式和承载力均与纯短剪切型耗能段相同。所得力学模型中,短剪切型耗能段包括弹性、弹塑性和塑性段;考虑摩擦滑移试件包括弹性和滑移段;扩孔螺栓连接型耗能段包括弹性、滑移、弹塑性和塑性段,且在达到相同位移时耗能段变形和损伤将明显减小。最后,对扩孔螺栓连接型耗能段进行有限元分析,可准确模拟其滞回曲线和破坏模式。An innovative amalgamation of the very short shear link(VSSL) and shear slotted bolted connection(SSBC),referred to as the VSSL-SSBC,ingeniously enhances the ductility and energy dissipation capacity of the VSSL,resulting in minimal damage.Consequently,the seismic resilience of eccentrically braced frames is markedly augmented.Cyclic loading tests were carried on a VSSL specimen,three VSSL-SSBC specimens with friction slip and a VSSL-SSBC specimen with ultimate deformation respectively,so the failure modes,hysteretic curves,bond curves and mechanical curves can be investigated.The experimental findings indicate that the mechanical property of the VSSL-SSBC exhibits a bifurcated developmental trajectory,characterized by initial stages involving friction slip within the SSBC and subsequent severe damage within the VSSL.Moreover,the ultimate bearing capacity and failure mechanisms of the VSSL-SSBC are observed to be congruent with those of the standalone VSSL.As for the mechanical curves,the VSSL exhibits distinct stages,encompassing elastic,elastic-plastic,and failure phases.In contrast,the SSBC is characterized by an initial elastic and subsequent slip phase.The VSSL-SSBC,a hybrid configuration,undergoes an extended sequence of elastic,slip,elastic-plastic,and failure stages.Notably,the deformation and damage of the VSSL within the VSSL-SSBC are significantly mitigated at equivalent displacements when compared to the standalone VSSL.Ultimately,the utilization of the finite element method(FEM) has been employed to corroborate the hysteretic curve and failure mechanisms with specimen VSSL-SSBC.The findings from the FEM simulations demonstrate a high degree of concordance with the experimental data.

关 键 词：扩孔螺栓连接型耗能段 力学性能 短剪切型耗能段 剪切扩孔型螺栓连接 滞回曲线 

分 类 号：TU311[建筑科学—结构工程] TU391