（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；  3 西安建筑科技大学土木工程学院， 西安 710055）

［摘要］为研究内配PVC管约束高强混凝土（PVC-RHC）短柱的滞回性能及抗剪承载能力，设计了5个试件进行拟静力试验，其中3个PVC-RHC 试件，内配钢管约束高强混凝土短柱（CST-RHC）、钢筋高强混凝土短柱（RHC）对比试件各1个。试验结果表明：所有试件均发生剪切斜压破坏；与试件RHC相比，内配PVC管和钢管约束高强混凝土短柱的滞回曲线更为饱满，耗能能力更强，强度衰减缓慢，极限变形大，延性提高；随着PVC管径高比和轴压比的增加，PVC-RHC试件的耗能能力和变形能力降低。采用《混凝土结构设计规范》（GB 50010—2010）对构件抗剪承载力进行计算发现，计算结果偏小，约有30%的安全富裕。最后根据试验破坏机理，建立力学分析模型，推导出构件抗剪承载力计算公式，计算结果与试验结果吻合较好。

［关键词］PVC； 高强混凝土； 短柱； 滞回性能； 抗剪承载力

中图分类号：TU398文献标识码：A文章编号：1002-848X(2017)21-0046-06

Hysteric behavior and  shear bearing capacity calculation of embedded PVC pipe confined reinforced  high-strength concrete short columns

Chen Zongping1,2, Ke Xiaojun1,3, Chen Yuliang1, Xue Jianyang3

(1 College of Civil Engineering and Architecture, Guangxi University， Nanning 530004, China;  2 Key Laboratory of Disaster  Prevention and Structural Safety of China Ministry of Education, Guangxi University, Nanning 530004, China; 3 School of Civil Engineering, Xi′an University of Architecture and Technology， Xi′an 710055, China)

Abstract:To study the hysteretic behavior and shear bearing capacity of embedded PVC pipe confined reinforced high-strength concrete (PVC-RHC) short columns, three PVC-RHC short columns specimens, one embedded steel tube confined reinforced high-strength concrete (CST-RHC) specimen and one reinforced high-strength concrete (RHC) specimen were designed for quasi-static test. Test results indicate that all specimens occur shear diagonal compression failure. Comparing with RHC short column, PVC-RHC and CST-RHC short columns have more plump hysteretic loops and better energy dissipation capacity. The bearing capacity degrades slowly, the limit deformation increases, and the ductility was improved. With the increasing of PVC diameter height ratio and axial compression ratio, the energy dissipation capacity and deformation capacity of PVC-RHC short columns decrease. Comparing with test results of the shear bearing capacity, the calculation results using Code for design of concrete structures(GB 50010—2010) have quite large safe factor (about 30%). Finally, the formulas for calculating the shear bearing capacity are derived according to the failure mechanism. The calculation results are in good agreement with test results.

Keywords:PVC; high-strength concrete; short column; hysteretic behavior; shear bearing capacity

*国家自然科学基金项目（51268004，51578163），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，教授，博士生导师，Email: zpchen@gxu.edu.cn。