滑移连接的防屈曲支撑RC框架节点抗震性能试验研究  

Subassemblage tests of buckling-restrained braced RC frame with sliding gusset connection

作　　者：赵俊贤[1,2] 宋佳雨 张家广[4] 于海潮 刘元珍[4] 王柏顺 ZHAO Junxian;SONG Jiayu;ZHANG Jiaguang;YU Haichao;LIU Yuanzhen;WANG Baishun(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510641,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641 [3]西南交通大学土木工程学院,四川成都610031 [4]太原理工大学土木工程学院,山西太原030024

出　　处：《建筑结构学报》2022年第6期207-218,共12页Journal of Building Structures

基　　金：国家自然科学基金项目(51778244,51708386);亚热带建筑科学国家重点实验室开放课题(2021ZB14);广东省杰出青年科学基金项目(2021B1515020057)。

摘　　要：防屈曲支撑(BRB)与框架之间采用的传统焊接节点会约束梁柱开合变形,在强震作用下易使框架先于支撑发生破坏。为释放传统焊接节点对梁柱的刚性约束,提出滑移连接的BRB框架节点,通过对预埋入混凝土内部的连接钢板表面进行无黏结处理,以抗拔不抗剪的方式传递BRB轴力。在滑移节点的工作原理、设计方法和施工流程基础上,对2个基于滑移连接的足尺BRB-框架梁柱组合体开展拟静力试验研究,并与1个传统焊接节点的破坏模式、滞回性能和节点应力进行比较。试验结果表明:当层间位移角达到1/33时,滑移节点的层剪力与传统焊接节点相比降低了34%,有效避免了框架发生剪切破坏;滑移节点的应力水平显著焊接节点的显著降低;在滑移节点与框架梁端设置的附加纵筋可更有效地减小节点区的开合效应和发挥BRB的耗能作用;滑移节点中BRB的滞回性能与传统节点的滞回性能接近。The traditional welded connection plates between the buckling-restrained braces(BRBs) and frame will induce a constraining effect on the frame action which leads to the failure of substructure members before the BRBs. A novel sliding gusset connection was proposed to solve the aforementioned problem in this study. It implemented debonding measures to the surfaces of the steel anchor plates in concrete to prevent them from resisting the shear force induced by the axial deformation of BRB while maintaining axial force transfer. Thus, the rigid constraining effect of traditional welded connection on the beam and column members was effectively released. The working principle, design method, and construction process of this connection were first presented. Subsequently, quasi-static sub-assemblage tests on three full-scale buckling-restrained braced RC frames, two with the proposed sliding configuration and another with traditional welded one, were carried out to verify the effectiveness of the proposed connection. The seismic behavior of three specimens, such as failure modes, hysteretic behaviors, and connection stress, were compared. It shows that the inter-story shear force of the specimens using the sliding connection decreased by 34% when the story drift ratio reached 1/33, compared with the specimen using traditional gusset connection. The shear failure of the sub-frame beams was effectively prevented. The stress levels of the gusset plates were also significantly reduced. Moreover, the combination of this sliding connection and the additional longitudinal reinforcements placed in the substructure beam end could effectively reduce the frame action and exert the energy dissipation of BRBs. In addition, the hysteretic behaviors of BRBs of the specimens using the sliding connection were similar to that of the traditional specimen.

关 键 词：RC框架 防屈曲支撑 开合效应 滑移连接 拟静力试验 抗震性能 

分 类 号：TU375.4[建筑科学—结构工程] TU317.1