椭圆形钢管混凝土构件性能的研究Ⅰ:轴压短柱和长柱  

Study on Behavior of Elliptical Concrete Filled Steel Tube Members Ⅰ:Stub and Long Columns under Axial Compression

作　　者：刘习超[1] 查晓雄[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院,广东深圳518055

出　　处：《建筑钢结构进展》2011年第1期8-14,共7页Progress in Steel Building Structures

摘　　要：本文通过理论方法推导出椭圆形钢管混凝土短柱轴心受压时外钢管与核心混凝土之间相互作用力的分布规律,并采用有限元模拟,得到核心混凝土侧压力分布云图,然后根据以上两种结果提出了核心混凝土有效受压区的分布假设,基于"统一理论"的思想,在已有圆钢管混凝土轴压短柱承载力统一公式的基础上,分析出椭圆形截面对套箍效应的影响,最终得出适合于椭圆形钢管混凝土轴压短柱的实用强度统一计算公式。同时,进行了6根椭圆形钢管混凝土短柱轴压试验,试验结果与公式计算结果吻合良好,有效地验证了公式及理论推导、有限元模拟的正确性。并在此基础上得到轴压长柱的稳定系数。In this paper,the distribution rule of interaction between steel tube and core concrete of elliptical concrete filled steel tube （CFST） short column under axial load is derived by theoretical methods,and the contour of pressure distribution of core concrete is obtained using finite element simulation. Then,the assumption of effectively confined zone distribution of core concrete is proposed according to the two results above,the influence of cross-section shape on the confinement effect is analyzed and an unified calculation formula of practical strength for elliptical CFST short column is obtained,based on the ideology of ＂Unified Theory＂ and existing unified formula of loading capacity of circular CFST short column under axial compression. Meanwhile,tests of six elliptical CFST short columns under axial load are completed and the test results are in good agreement with the results of formula,effectively verifying the correctness of calculation formula,theoretical analysis and finite element simulation. Based on it,the stability factor of long columns is obtained.

关 键 词：椭圆形钢管混凝土 轴心受压 理论推导 稳定系数 

分 类 号：TU398[建筑科学—结构工程]