考虑初应力的钢管混凝土柱轴压承载力统一解  

Unified Solution of Bearing Capacity for Concrete-filled Steel Tube Column with Initial Stress under Axial Compression

作　　者：李艳[1] 赵均海[1] 梁文彪[1] 王苏[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》2013年第3期63-69,共7页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金(50908015);陕西省自然科学基金(2011JM7002);教育部博士点基金(20110205130001)

摘　　要：采用双剪统一强度理论,考虑中间主应力和材料拉压比的影响,对有初应力的钢管混凝土轴压短柱的受力性能进行理论分析,引入考虑长细比影响的折减系数,建立了考虑初应力的钢管混凝土柱轴压极限承载力的统一解。将计算结果与文献试验结果进行对比,吻合良好,验证了公式的合理性。推导出一个新的初应力影响系数,并对其各参数进行分析。该结果为研究初应力对钢管混凝土轴压构件力学性能的影响提供了理论依据,具有一定的实际参考价值。Based on the twin shear unified strength theory which considers the influence of intermediate principal stress and the strength-differential of materials, the mechanical behavior of concrete-filled steel tube（CFST） short column is investigated. Whilst considering the influence of slenderness ratio, unified solution of ultimate bearing capacity for CFST column with initial stress under axial compression is developed. Through comparing the results of proposed formula with that of experiments,the rationality of proposed formula is proved. Furthermore, according to the investigation, a new influence coefficient of initial stress is deduced. The results can provide some theoretical references for the study of CFST columns considered the effect of initial stress. And the solution may have some important practical value.

关 键 词：双剪统一强度理论 钢管混凝土 初应力 轴压承载力 

分 类 号：TU398.9[建筑科学—结构工程]