预制钢管混凝土核心区-梁端耗能装配式框架节点滞回试验  

Experiments on hysteretic behavior of assembled joint with precast concrete-filled steel tube core-beam end energy dissipation

作　　者：庄金平 董书清 陈剑星 陶钢 ZHUANG Jinping;DONG Shuqing;CHEN Jianxing;TAO Gang(College of Civil Engineering,Fujian University of Technology,Fuzhou 350118,P.R.China;Fujian-Taiwan Cooperative Institute of Civil Engineering Technology in Universities of Fujian Province,Fujian University of Technology,Fuzhou 350118,P.R.China)

机构地区：[1]福建理工大学土木工程学院,福州350118 [2]福建理工大学闽台合作土木工程新技术福建省高校工程研究中心,福州350118

出　　处：《重庆大学学报》2023年第10期86-97,共12页Journal of Chongqing University

基　　金：国家自然科学基金面上项目(51678152);福建省高校新世纪人才项目(GY-Z17069);福建工程学院科研启动基金(GY-Z13119)。

摘　　要：装配式结构中预制框架梁与框架柱连接的可靠性尤为重要,是研究的热点。笔者提出一种预制装配式框架连接节点,该节点核心区采用预制钢管约束钢纤维自密实混凝土的形式,预制混凝土梁外伸钢筋与贯穿预制节点核心区的钢组件焊接连接、然后在梁端局部现浇钢纤维自密实混凝土实现预制混凝土梁与预制核心区的连接。为验证其可靠性,设计了1个装配式框架节点和1个对比的现浇框架节点进行滞回性能试验研究,对比分析了2种节点在延性、强度和刚度退化、耗能能力、梁端塑性铰区域弯矩-曲率等方面的差异。试验结果表明:所设计的2个试件均发生梁端塑性铰破坏,但贯穿装配式节点核心区的钢组件、外包钢管及柱钢筋均未屈服、核心区外包钢管也未发鼓曲;此外,该装配式框架节点的延性、耗能能力、承载力等指标均略高于现浇框架节点,说明该装配式框架节点能达到等同现浇的水平。In the field of fabricated structures,ensuring the connection reliability between precast frame beams and columns is of paramount importance and represents a current research focus.This paper introduces a prefabricated frame joint centered around a core area consisting of a precast concrete-filled steel tube.The precast concrete beam connects with the steel component via the core area,and cast-in-place steel fiber self-compacting concrete is employed at the beam end to establish the connection between the precast concrete beam and the precast core area.To assess feasibility,a new type of frame joint is designed and compared with a conventional cast-in-place frame joint.Hysteretic behavior of the joint is examined,and differences in ductility,strength,stiffness degradation,energy dissipation capacity,and moment-curvature of plastic hinge region between the two types of joints are analyzed and compared.The results show that both specimens exhibited a plastic hinge failure mode,but the new joint’s steel components,steel tubes,and column reinforcement remained unyielded.Furthermore,the new joints demonstrated slightly superior ductility,energy dissipation capacity,and bearing capacity when compared to the cast-in-place joint.This suggests that the assembled joint can at least meet the requirements of the cast-in-place joint.

关 键 词：装配式节点 预制核心区 钢纤维自密实混凝土 滞回试验 抗震性能 

分 类 号：TU391[建筑科学—结构工程]