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螺旋箍筋PVC管联合约束混凝土轴压短柱试验研究*
陈宗平1,2,杨阳1
摘 要

(1 广西大学土木建筑工程学院, 南宁 530004;2 广西大学工程防灾与结构安全教育部重点实验室, 南宁 530004)

[摘要]为了研究螺旋箍筋PVC管联合约束混凝土短柱的受力性能,设计了20个试件进行轴压试验,包含12个螺旋箍筋PVC管联合约束短柱试件、7个单纯PVC管约束短柱试件和1个普通钢筋混凝土短柱对比试件。试验考虑了约束核心区面积比、螺旋箍筋直径和间距、纵向钢筋直径以及方形箍筋间距等变化参数。通过试验观察了试件的受力过程与形态,获取其轴向荷载-位移曲线、极限承载力、延性系数、耗能因子等数据,并分析了核心区面积比、螺旋箍筋直径及间距、纵向钢筋直径、方形箍筋间距等参数对试件轴压性能的影响规律。研究结果表明:单纯PVC管约束混凝土短柱及螺旋箍筋PVC管联合约束混凝土短柱的破坏过程和形态与普通钢筋混凝土短柱相似。与普通钢筋混凝土短柱相比,单纯PVC管约束的混凝土短柱的极限承载力更低,但延性及耗能能力有所增加。对于螺旋箍筋PVC管联合约束混凝土短柱而言,加密螺旋箍筋间距可以显著提高其极限承载力,但会削弱试件的延性及耗能能力;增大螺旋箍筋直径,能够略微提高试件延性及耗能能力,对极限承载力影响不大;增大螺旋箍筋PVC管核心区面积比,可以增大试件的极限承载力,但会降低其延性及耗能能力;与普通钢筋混凝土相似,增大纵向钢筋直径或加密方形箍筋间距,均能提高试件的承载能力、延性及耗能能力。

[关键词]螺旋箍筋; PVC管; 联合约束; 短柱; 轴心受压

中图分类号:TU375文献标识码:A文章编号:1002-848X(2019)02-0043-06

 

Experimental study on axial compressive short concrete column cooperatively constrained by PVC tube and spiral stirrup

Chen Zongping1,2, Yang Yang1

(1 College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 2 Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China)

Abstract:In order to study the mechanical properties of short concrete columns cooperatively constrained by PVC tube and spiral stirrup, 20 specimens were designed for axial compression test, including 12 short column specimens cooperatively constrained by PVC tube and spiral stirrup, 7 short column specimens constrained by pure PVC tube and 1 comparison specimen of ordinary reinforced concrete short column. The parameters such as cooperatively constrained core area ratio, diameter and spacing of spiral stirrup , diameter of longitudinal reinforcement and spacing of square  stirrups were taken into account. The axial  load-displacement curve, ultimate bearing capacity, ductility coefficient and energy dissipation factor of the specimens were obtained by observing the stress process and shape of the specimens through experiments. The impacts of the parameters above on axial compressibility of the specimens were analyzed. The results show that the failure process and shape of concrete short columns that cooperatively constrained by PVC tube and spiral stirrup or constrained by pure PVC tube are similar to those of ordinary reinforced concrete short columns. Compared with those ordinary reinforced concrete short columns, the bearing capacity of column specimens constrained by pure PVC tube is lower, and the ductility and energy dissipation capacity are increased. Strengthening spiral stirrup spacing can significantly increase ultimate bearing capacity of column specimens cooperatively constrained by PVC tube and spiral stirrup, but it will weaken the ductility and energy dissipation capacity of the specimens; increasing the diameter of spiral stirrup  can slightly improve the ductility and energy dissipation capacity of the specimens, but has little effect on ultimate bearing capacity; increasing the cooperatively constrained core area ratio can increase ultimate bearing capacity of the specimens, but will reduce their ductility and energy dissipation capacity; like ordinary reinforced concrete, increasing the diameter of longitudinal reinforcement and strengthening square stirrups spacing can improve ultimate bearing capacity, ductility and energy dissipation capacity of the specimens.

Keywords:spiral stirrup; PVC tube; cooperative constraint; short column; axial compression

 

*国家自然科学基金项目(51578163),广西自然科学基金重点项目(2016GXNSFDA380032),广西高等学校高水平创新团队及卓越学者计划资助项目(桂教人[2017]38号)。

 

作者简介:陈宗平,博士,教授,博士生导师,Email: zpchen@gxu.edu.cn。

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