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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

36卷

期数:

2019年02期

页码:

84-91

栏目:

出版日期:

2019-03-26

文章信息/Info

Title:

Seismic Behavior of Square Tube Confined Steel-reinforced Concrete Column-RC Ring Beam Joint

文章编号:

1673-2049(2019)02-0084-08

作者:

聂少锋¹,叶梦娜¹,武杨凡¹,丁武侠²,朱纪钊¹

(1. 长安大学 建筑工程学院,陕西 西安 710061; 2. 石榴置业集团股份有限公司,北京 100079)

Author(s):

NIE Shao-feng¹, YE Meng-na¹, WU Yang-fan¹, DING Wu-xia², ZHU Ji-zhao¹

(1. School of Civil Engineering, Chang’an University, Xi’an 710061, Shaanxi, China; 2. Anar Group Incorporated Company, Beijing 100079, China)

关键词:

方钢管约束型钢混凝土柱;  抗震性能;  RC环梁节点;  低周循环荷载

Keywords:

square tube confined steel-reinforced concrete column;  seismic behavior;  RC ring beam joint;  low cyclic loading

分类号:

TU398

DOI:

-

文献标志码:

A

摘要:

为研究方钢管约束型钢混凝土柱-RC环梁节点的抗震性能,利用有限元分析软件ABAQUS建立了该节点的有限元模型。通过对已有试验中的圆钢管约束型钢混凝土柱-RC环梁节点抗震性能的模拟分析,验证了有限元计算结果的正确性,进而对方钢管约束型钢混凝土柱-RC环梁节点的受力性能进行了数值模拟分析,研究了该节点在低周循环荷载作用下的破坏模式、滞回曲线、骨架曲线及节点延性; 同时考察了柱内型钢含钢率、柱轴压比和环梁配筋率对节点抗震性能的影响。结果表明:方钢管约束型钢混凝土柱-RC环梁节点的滞回曲线饱满,具有良好的抗震性能; 在节点核心区设置环梁后,节点试件的最终破坏模式为梁端形成塑性铰破坏,环梁对节点核心区保护作用明显,满足“强柱弱梁”及“强节点、弱构件”的抗震设计原则; 随着柱内型钢含钢率及环梁配筋率的降低,节点试件的最大荷载、延性系数和抗震性能均有所降低,且强度退化加快; 轴压比对节点抗震性能影响较大,当轴压比从0.31增加至0.63时,节点试件的延性系数从4.14降低至2.12,最大荷载降幅高达15.16%。

Abstract:

In order to study the seismic behavior of square tube confined steel-reinforced concrete column-RC ring beam joint, the finite element model of the joint was established by using finite element analysis software ABAQUS. The correctness of the finite element calculation results was verified by the comparative analyses of circular steel tube confined steel-reinforced concrete column-RC ring beam joint in the existing tests. Then the numerical analyses of the mechanical behavior of square tube confined steel-reinforced concrete column-RC ring beam joint was carried out. The failure mode, hysteresis curve, skeleton curve and joint ductility of the joints under low cyclic loading were studied. The effects of inner steel ratio of section, axial compression ratio and reinforcement ratio of ring beam on the seismic behavior of the joints were also investigated. The results show that the hysteretic curves of square tube confined steel-reinforced concrete column-RC ring beam joint is full and the joint has good seismic behavior. After setting the ring beam in the core area of node, the failure mode of the joint specimen is the plastic hinge failure at the end of beam. The ring beam has the protection effect obviously on the core area of the joint, and the joint satisfies the seismic design principles of “strong column and weak beam” and “strong-joint and weak-member”. With the decrease of the inner steel ratio of column and the reinforcement ratio of ring beam, the maximum load, ductility coefficient and seismic performance of joints decrease, and the strength degradation is accelerated. The axial compression ratio has great influence on the seismic behavior. If the axial compression ratio increases from 0.31 to 0.63, the ductility coefficient of the specimen is reduced from 4.14 to 2.12, and the decreasing amplitude of the maximum load is as high as 15.16%.

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备注/Memo

备注/Memo:

收稿日期:2018-07-14
基金项目:国家自然科学基金项目(51408052); 陕西省重点研发计划项目(2018SF-354); 陕西省青年科技新星项目(2016KJXX-51)
作者简介:聂少锋(1981-),男,河北石家庄人,副教授,工学博士,E-mail:niesf126@126.com。

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更新日期/Last Update: 2019-03-27