自复位胶合木框架结构设计方法与地震易损性分析  

Seismic design and fragility analysis of self-centering glulam post-and-beam structures

作　　者：李征[1] 吴婷婷 舒展 陈飞[1] 何敏娟[1] LI Zheng;WU Tingting;SHU Zhan;CHEN Fei;HE Minjuan(Department of Structural Engineering,Tongji University,Shanghai 200092,China;Department of Civil Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]同济大学建筑工程系,上海200092 [2]上海大学土木工程系,上海200444

出　　处：《建筑结构学报》2021年第3期211-222,共12页Journal of Building Structures

基　　金：国家自然科学基金项目(51878476,51608376)。

摘　　要：自复位体系可以降低结构震后残余变形,提高震后快速恢复能力。将自复位体系与胶合木框架结构相结合,是提高木框架结构抗震韧性的重要途径之一。为此,提出了自复位胶合木梁柱节点(self-centering glulam post-and-beam joint)设计方法,并对自复位结构(self-centering structure)进行抗震性能评估。通过对两种构造的自复位节点(无耗能件节点和带特制角钢耗能件节点)进行拟静力试验。依据试验结果提出节点设计流程,并以一栋三层自复位胶合木框架结构为算例,采用OpenSees建立了算例的简化数值模型。对算例进行了两方面的抗震性能评估,一方面通过弹塑性动力时程分析,验证结构设计流程的可行性;另一方面,进行最大层间位移角与残余层间位移角的地震易损性分析。易损性分析结果表明,相比传统胶合木框架结构,依据所提流程设计的自复位胶合木框架结构,可以显著减小结构残余变形。Self-centering structures aim at decreasing post-earthquake residual drift to provide fast post-earthquake structural restoring capacity. The combination of self-centering system with glulam post-and-beam structures is one of the solutions to improve the resilience of timber structures. This study presented a design method for self-centering glulam post-and-beam connections and evaluated the seismic performance of self-centering structures. Firstly,quasistatic cyclic loading tests were performed on two different self-centering connections. One of the connections used specialized steel cap as the energy dissipator,while the other had no dissipators. Then,based on the test results,a design procedure was proposed and a 3-story self-centering glulam post-and beam structure prototype was designed.The corresponding simplified numerical model was developed within the OpenSees framework. Finally,nonlinear time history analysis was performed to verify the design procedure and a series of fragility curves were generated based on the nonlinear time history analytical results. The fragility analysis shows that the residual inter-story drift of the selfcentering structures decreases significantly compared with conventional glulam structures.

关 键 词：胶合木框架结构 自复位结构 节点试验 设计方法 地震易损性分析 

分 类 号：TU366.304[建筑科学—结构工程] TU317.1