带约束拉杆方形钢管混凝土短柱恢复力模型研究*
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（1 华南理工大学土木与交通学院， 广州 510641； 2 华南理工大学亚热带建筑科学国家重点实验室， 广州 510641；3广东工业大学土木与交通工程学院， 广州 510006）
［摘要］为研究带约束拉杆方形钢管混凝土短柱的恢复力特性，进行了2个不带约束拉杆和8个带约束拉杆方形钢管混凝土短柱试件在低周反复荷载作用下的试验研究。基于OpenSees纤维截面建立带约束拉杆方形钢管混凝土短柱的纤维模型，并对其滞回性能进行计算，数值分析结果与试验结果吻合较好，在模型得到验证的基础上，进一步考虑了轴压比、钢管壁厚、混凝土抗压强度、钢管屈服强度、约束拉杆间距、长细比等因素对骨架曲线的影响，基于分析结果，回归分析得出带约束拉杆方形钢管混凝土短柱的恢复力模型。结果表明：在研究参数范围内提出的恢复力模型与试验结果吻合较好。［关键词］方形钢管混凝土短柱; 约束拉杆; 恢复力模型; 纤维模型; OpenSees软件中图分类号：TU317.1，TU398.9 文献标识码：A 文章编号：1002-848X(2015)20-0034-06
Research on the restoring force model of square concrete-filled tubular stub columns with binding barsWang Yingtao1, Cai Jian2, Long Yueling3, Chen Qingjun2(1 School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China; 2 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China; 3 School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China)Abstract: In order to study the restoring force characteristics of square concrete-filled tubular (CFT) stub columns with binding bars, two square CFT stub columns without binding bars and eight square CFT stub columns with binding bars were carried out subjected to low constant compression and cyclic lateral load. The fiber model of the square CFT stub columns with binding bars was built based on the fiber section in OpenSees software, and the hysteretic behavior was calculated. The simulated hysteretic curves show good agreement with the experimental ones. Then, the influences of axial compression ratio, thickness of steel tube, concrete compressive strength, yield strength of steel tube, spacing of binding bars and slenderness ratio on the resilience model of skeleton curves were discussed. The restoring force model of square concrete-filled tubular stub columns with binding bars was given based on the regression analysis. The results of hysteretic cures from the suggested model show good agreement with the experimental results.Keywords: square concrete-filled tubular stub column; binding bar; restoring force model; fiber model; OpenSees software
*国家自然科学基金项目（51008085）,亚热带建筑科学国家重点实验室研究项目（2011ZC25，2013ZC14，2013ZC19）,广州市珠江科技新星专项（2012J2200100）,中央高校基本科研业务费专项资金资助（2014ZZ0026）,中国博士后基金资助项目（2012M511810，2014T70807）。作者简介：王英涛，博士研究生，Email:scutwyt@163.com。
