方形高强钢管混凝土叠合柱轴压极限承载力分析  

Ultimate bearing capacity of square steel tube-reinforced high strength concrete column under axial compression

作　　者：赵均海[1] 侯玉林[1] 张常光[1] 

机构地区：[1]长安大学建筑工程学院,西安710061

出　　处：《土木建筑与环境工程》2016年第5期20-26,共7页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金(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(2014M562358;2014M562357);陕西省自然科学基础研究计划(2014JQ7290;2015JM4146);长安大学中央高校基本科研业务费专项基金(310826161007)~~

摘　　要：对于新提出的方形高强钢管混凝土叠合柱的极限承载力,基于统一强度理论,考虑中间主应力和材料拉压比的影响,引入有效约束系数和非有效约束系数并考虑箍筋对钢管外混凝土约束作用的不同,把钢管外箍筋约束混凝土划分为有效约束区和非有效约束区,将方形截面等效为圆形截面以考虑钢管核心混凝土受到的钢管和外围钢筋混凝土的双重约束效应,提出了方形高强钢管混凝土叠合柱的一种新的轴压极限承载力计算方法。将所得理论计算结果与文献试验结果进行对比,吻合良好,证明了公式的正确性。对各参数的影响规律分析表明,方形高强钢管混凝土叠合柱的承载力随着侧压系数、中间主应力影响系数、材料拉压比和纵向配筋率的增大而增大,随着钢管径厚比的增大而减小。Based on the unified strength theory and the influences of intermediate principal stress and the material of tension and compression ratio were considered when coming down to the ultimate bearing capacity of square steel tube-reinforced high strength concrete column.Effective constraint coefficient and ineffective constraint coefficient were introduced to consider the different constraint functions of concrete derived from the stirrups,the constraint concrete outside steel tube was divided into effective constraint region and ineffective constraint region.The square section was equivalent to circular section to consider the double constraint function to concrete in steel tube derived from steel tube and outer steel reinforcedconcrete.Then a new method for the axial ultimate bearing capacity of square steel tube-reinforced concrete column was deduced.The results were in good agreement with the experimental results and the correctness of the theory formulae was proved.Influential effects of some parameters were analyzed and the analysis results showed that the ultimate bearing capacity of square steel tube-reinforced high strength concrete column increased with the increase of the side pressure coefficient.Influence coefficient of intermediate principal stress,the material of tension and compression ratio and the longitudinal reinforcement ratio,while it decreases with the increase of radius-thickness ratio.

关 键 词：钢管混凝土叠合柱 箍筋约束 强度理论 极限承载力 

分 类 号：TU312[建筑科学—结构工程] TU398