四螺箍约束钢筋混凝土方形柱抗震性能研究  

Study on seismic performance of square reinforced concrete columns with four interlocking spirals

作　　者：覃龙寿 陈健伟 周济 莫琳琳 陈宗平[1,3] QIN Longshou;CHEN Jianwei;ZHOU Ji;MO Linlin;CHEN Zongping(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Guangxi Hualan Engineering Management Corporation,Nanning 530012,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西华蓝工程管理公司,广西南宁530012 [3]工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《地震工程与工程振动》2023年第3期106-117,共12页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51578163);广西科技基地与人才专项(桂科AD21075031);广西八桂学者专项研究项目([2019]79号);中央引导地方科技发展项目(桂科ZY21195010)。

摘　　要：将螺旋箍筋应用于钢筋混凝土方柱,通过合理的横向箍筋配置形式,不仅便利施工,还可有效地减小构件侧向约束不均匀的“拱效应”,提高其承载能力和变形能力,增强其抗震性能。基于此,对新型四螺箍约束钢筋混凝土方柱的抗震性能进行了试验研究与有限元分析。试验结果表明:水平低周反复荷载作用下,四螺箍约束钢筋混凝土方柱主要表现为弯曲破坏,其特征为在构件底部1/3高度以下形成弯曲网状裂缝;与传统单螺旋箍筋约束钢筋混凝土方柱构件相比,体积配箍率较小的四螺箍约束钢筋混凝土方柱仍能表现出更高的承载力、延性和耗能能力;纵筋率对四螺箍约束构件的抗震性能指标影响较大。有限元分析结果表明,随着四螺箍约束构件径宽比的增大,其承载力提高,但变形能力降低,刚度退化现象更为严重。The seismic performance and construction automation of square reinforced concrete columns would be enhanced through the application of transverse reinforcement configuration containing spiral stirrup,which can weaken the arch effect of non-uniform lateral confining stress distribution and thus improve the load bearing capacity and deformation capacity of the specimen.This paper investigated the seismic performance of a newly proposed interlocking multi-spiral reinforced square composite column(IMSRSCC)experimentally and numerically.The experimental results indicated that all specimens under composite confinement exhibited similar flexural failure mode with web-like shear cracks forming at the bottom of 1/3 height of entire specimen.Compared with conventional single spiral reinforced square composite column(SSRSCC),the load bearing capacity,deformation capacity and the energy dissipation capacity of IMSRSCC even with a slightly smaller volumetric ratio of transverse reinforcement was improved,as well as the degradation speed of strength and stiffness was slower.The effect of longitudinal ratio on the seismic performance of IMSRSCC was significant.Increasing D 1/B 1 can contribute to improving the ultimate bearing capacity of IMSRSCC,while the ductility and stiffness decreased.

关 键 词：螺旋箍筋 钢筋混凝土方柱 抗震性能 复合约束 有限元分析 

分 类 号：TU528[建筑科学—建筑技术科学]