基于统一强度理论的钢管混凝土柱承载力计算  

Calculation of the Compressive Strength of Concrete Filled Steel Tube(CFST) Based on the Twin Shear Unified Strength Theory

作　　者：史庆轩[1] 戎翀 任浩[1] 张婷[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《力学季刊》2015年第4期690-696,共7页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(51478382;51178380);高等学校博士学科点专项科研基金(20116120110004)

摘　　要：从Von Mises屈服准则和双剪统一强度理论出发,对钢管和核心混凝土的受力性能进行分析.从核心区混凝土所受侧向压应力的角度出发,基于大量实验数据,得到核心区混凝土约束系数计算公式.从而完善了钢管混凝土柱的轴心受压承载力计算公式,使公式的精确性和适用性有所提高.所得计算结果与试验结果吻合良好,并与目前公式的计算结果进行对比,说明所提出公式的合理性.从尺寸大小和材料强度两个方面,对钢管混凝土柱承载力的影响因素进行探讨.The mechanical property of steel tube and strain-constrained concrete cylinders in CFST was analyzed based on Von Mises yield criterion and the Twin Shear Unified Strength Theory. For lateral pressure loads of strain-constrained concrete cylinders,formulae of restraint coefficient of strain-constrained concrete cylinders were presented based on a lot of test data. Furthermore,formulae of compressive strength were improved. The formulae were more precise and applicable. Results from the formulae were compared with test results and satisfactory agreements were found. Comparing with the results of current formulae,these of the present paper were more precise. For size and material strength of CFST,influence factors of bearing capacity are analyzed.

关 键 词：钢管混凝土柱 双剪统一强度理论 约束系数 轴心受压承载力 影响因素 

分 类 号：TU398[建筑科学—结构工程]