纤维增强复材-混凝土-钢管组合实心方形短柱轴压承载力分析  

ANALYSIS OF AXIAL BEARING CAPACITY OF FRP-CONCRETE-STEEL COMPOSITE SOLID SQUARE COLUMN

作　　者：侯玉林[1] 赵均海[1] 曹雪叶 Hou Yulin Zhao Junhai Cao Xueye(School of Civil Engineering, Chang＇ an University, Xi＇ an 710064, China)

机构地区：[1]长安大学建筑工程学院,西安710064

出　　处：《工业建筑》2016年第12期163-167,162,共6页Industrial Construction

基　　金：国家自然科学基金项目(41202191;51508028);陕西省社会发展科技攻关项目(2015SF272);中国博士后科学基金项目(2014M562358;2014M562357);长安大学中央高校基本科研业务费专项基金项目(310826161007);长安大学优秀博士学位论文培育资助项目(310828150018)

摘　　要：以纤维增强复材(FRP)-混凝土-钢管组合实心方形短柱为研究对象,根据夹层混凝土受到约束作用的不同,将其划分为有效约束区和非有效约束区;同时考虑夹层混凝土受到的双重约束,将方形纤维增强复材布转化为圆形FRP布。基于统一强度理论,考虑中间主应力、材料拉压比以及倒角半径的影响,推导得到FRP-混凝土-钢管组合实心方形短柱的轴压承载力计算式。将理论计算结果与相关文献试验结果对比,吻合良好,证明了算式的正确性和合理性。对影响因素的分析表明:轴压承载力随中间主应力系数、侧压系数的增加而变大,随着倒角半径的增大先增大后减小,随着钢管径厚比的增大而减小。Taking FRP-concrete-steel composite solid square stub column as object of study,the sandwich concrete was divided into effective constraint region and invalid constraint region according to the different constraint degree of sandwich concrete. Considering the double effect of restraint of core concrete,the square FRP pipe was equivalent to circular FRP pipe. Based on the unified strength theory,the influences of intermediate principal stress parameter,the tension and compression ratio of material,chamfering radius were considered,the calculation formula of axial bearing capacity of FRP-concrete-steel composite solid square stub column was deduced. Comparing the calculation results with relevant experiment results,the good comparison result can illustrate the correctness and rationality of the theoretical formula. Analytic results of various influential factors showed that axial bearing capacity of FRP-concretesteel composite solid square stub column increased with the increase of intermediate principal stress parameter and side pressure coefficient,and increased firstly and then declined with the increase of chamfering radius,while decreasing with increase of radius-thickness ratio.

关 键 词：FRP-混凝土-钢管组合实心方柱 等效圆 双重约束 统一强度理论 轴压承载力 

分 类 号：TU398.9[建筑科学—结构工程]