装配式混凝土框架-Y形偏心钢支撑结构体系抗震性能研究  

Study of the seismic performance for an innovative prefabricated concrete frame-Y shaped eccentrically steel brace structure

作　　者：郭琪 姜俊 胡淑军[1,3] 熊进刚 宋固全[1] GUO Qi;JIANG Jun;HU Shujun;XIONG Jingang;SONG Guquan(School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China;Hongdu Construction Group CO.,LTD.,Nanchang 330011,China;Zhongheng Constructuion Group Co.,Ltd,Nanchang 330031,China)

机构地区：[1]南昌大学建筑工程学院,江西南昌330031 [2]洪都建设集团有限公司,江西南昌330011 [3]中恒建设集团有限公司,江西南昌330031

出　　处：《自然灾害学报》2020年第5期140-149,共10页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51768044,51908268);江西省博士后科研择优资助项目(2019KY57)。

摘　　要：将短剪切型耗能段和Y形偏心钢支撑引入全装配式混凝土框架结构中,并结合装配整体式混凝土框架结构,可得到一种装配式混凝土框架-Y形偏心钢支撑结构体系,以更好适应当前抗震要求。为将损伤集中在耗能段和装配式混凝土梁上,提出并研究一种基于弯剪分离的全装配式混凝土梁-耗能段组合节点、一种全装配式混凝土梁柱-钢支撑组合节点。设计某12层装配式混凝土框架-Y形偏心钢支撑结构体系,并采用弹塑性时程分析方法研究其抗震性能。结果表明,在保证各关键节点性能的前提下,该结构在不同地震下均能满足要求,且耗能段率先剪切屈服耗能,随后不带Y形偏心钢支撑的框架梁发生弯曲屈服,与预期抗震性能相符。另外,带Y形偏心支撑的框架梁-梁间采用铰接连接,可有效降低全装配式混凝土梁柱-钢支撑连接节点的受力,防止框架梁产生塑性铰,使结构具有抗震性能好和震后功能可恢复等特点。In this project,an innovative prefabricated concrete frame-Y shaped eccentrically steel brace structure that combines with shear links and Y shaped eccentrically braces and prefabricated concrete frame is developed,which has an advantage of good seismic performance and seismic resilience capacity.During rare earthquake,only the shear links and prefabricated concrete beams can be designed to allow high ductility and energy dissipation capacity,so two new types of precast concrete beam-to-shear link composite joint with the moment and shear force separate method,precast concrete beam and column-to-steel brace composite joint are presented and studied to achieve the expected performance.A 12-story prefabricated concrete frame-Y shaped eccentrically steel brace structure system(PRC-Y-ESBS)is designed to validate the seismic performance by nonlinear dynamic analysis.Numerical analysis results show that the inter-story drift ratio under different seismic ground motions can meet the standard requirement while the two composite joints can be assumed to rigid,and the shear links will yield in shear force firstly,then the concrete beams in pure frame yield in moment,which is exactly same with the expected seismic performance.In addition,the pinned joint between concrete beam and beam in Y shape eccentrically frame will effectively reduce the concentrated force and prevent plastic hinge between the concrete beam and column and steel brace.It is expected that the seismic performance and seismic resilience capacity of PRC-Y-ESBS will be dramatically improved.

关 键 词：全装配式混凝土框架结构 Y形偏心钢支撑 耗能段 组合节点 抗震性能 

分 类 号：TU391[建筑科学—结构工程] X9[环境科学与工程—安全科学]