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

发布时间：2018-01-11 19:11

本文关键词：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　出处：《工业建筑》2016年12期 　论文类型：期刊论文

【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。
[Abstract]:The FRP- concrete-steel tube composite square short columns with fiber reinforced composite materials are taken as the research object. According to the different confined action of sandwich concrete, they are divided into effective confinement zone and non-effective confinement zone. At the same time, considering the double constraints of sandwich concrete, the square fiber reinforced composite material cloth is transformed into circular FRP cloth. Based on the unified strength theory, the effects of intermediate principal stress, material tension / compression ratio and chamfer radius are considered. The formula of axial compression capacity of FRP-concrete-steel tube composite square short column is derived. The theoretical calculation results are in good agreement with the experimental results. It is proved that the formula is correct and reasonable. The analysis of the influencing factors shows that the axial compression capacity increases with the increase of the intermediate principal stress coefficient and the lateral pressure coefficient, and increases first and then decreases with the increase of the chamfer radius. With the increase of diameter to thickness ratio of steel pipe, it decreases.
【作者单位】：长安大学建筑工程学院;
【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)
【分类号】：TU398.9
【正文快照】： 纤维增强复材(FRP)-混凝土-钢管由外层纤维增强复材(FRP)、内层钢管以及二者之间的混凝土构成。该组合柱具有显著的优点[1-3]:与FRP约束混凝土相比,在施工阶段,内钢管能很好地承受施工荷载,在使用阶段,由于内层钢管对混凝土的加劲作用,组合柱的承载力显著提高,且具有较高的刚

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