弯曲破坏模式可控的BRB-RC框架子结构抗震性能试验研究  

Experimental study on seismic behavior of BRB-RC frame sub-structure with controllable bending failure mode

作　　者：张家广[1,2] 郝淑飞 赵俊贤 张少军[1] 宋佳雨 刘元珍 ZHANG Jiaguang;HAO Shufei;ZHAO Junxian;ZHANG Shaojun;SONG Jiayu;LIU Yuanzhen(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,China Earthquake Administration,Harbin 150080,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of Subtropical Building and Urban Science,South China University of Technology,Guangzhou 510641,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]太原理工大学土木工程学院,山西太原030024 [2]中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [3]华南理工大学土木与交通学院,广东广州510641 [4]华南理工大学亚热带建筑与城市科学全国重点实验室,广东广州510641 [5]西南交通大学土木工程学院,四川成都610031

出　　处：《建筑结构学报》2024年第12期42-55,共14页Journal of Building Structures

基　　金：国家自然科学基金项目(51708386,51778244);中国地震局工程力学研究所基本科研业务费专项(2021D25)。

摘　　要：为有效防止梁柱开合效应引起的防屈曲支撑钢筋混凝土框架(BRB-RC)子结构先于BRB发生剪切或弯剪破坏,并解决当前滑移连接存在锚固板承载力受限以及子结构梁受剪承载力设计不合理等问题,提出一种基于滑移连接的RC框架子结构梁柱破坏模式可控设计方法,并对1个传统节点连接和4个滑移连接的足尺BRB-RC梁柱组合体进行拟静力试验,考察子结构破坏模式、滞回性能和耗能能力等抗震性能,验证滑移连接和破坏模式可控设计方法的有效性。结果表明:滑移连接性能稳定,能够显著降低子结构梁剪力和梁塑性损伤,增强BRB对子结构的耗能减震效果;在梁端增设附加纵筋和纵向分布钢筋能够有效提高节点板内侧子结构梁段受剪承载力,从而实现弯曲破坏模式的目标。To effectively prevent the buckling-restrained braced reinforced concrete(BRB-RC)frame substructure from shear or flexural-shear failure caused by frame action prior to the BRB,a controllable failure mode design method based on a novel sliding gusset connection was proposed.The method addresses problems of the current siding gusset connection,such as the limited bearing capacity of the anchorage plate and the unreasonable design of the shear capacity of substructure beams.Quasi-static tests were conducted on five full-scale BRB-RC subassemblages,one with a traditional connection and the others with the proposed sliding gusset connection to verify the effectiveness of the sliding gusset connection and the design method.The failure modes,hysteresis behavior and energy dissipation capacity of sub-structure were investigated.It is shown that the sliding gusset connection has stable performance and could significantly reduce the shear force of the sub-structure beam and plastic damage level.The energy dissipation proportion of the BRB significantly increases.The additional rebars and longitudinal distribution rebars at the beam end can effectively enhance the shear capacity of the sub-structure beam within gusset plate region,thus realizing the bending failure mode.

关 键 词：钢筋混凝土框架 防屈曲支撑 子结构 滑移连接 弯曲破坏模式可控 拟静力试验 抗震性能 

分 类 号：TU375.4[建筑科学—结构工程] TU317.1