圆钢管轻骨料混凝土轴压短柱的力学性能分析  

Analytical properties of axially loaded lightweight aggregate concrete filled circular steel tubular stub columns

作　　者：丁发兴[1,2] 应小勇[1] 余志武[1] 欧进萍[2] 

机构地区：[1]中南大学土木建筑学院,长沙410075 [2]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《深圳大学学报（理工版）》2011年第3期207-212,共6页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(50808180);教育部博士点基金资助项目(200805331064)~~

摘　　要：分析现有钢管轻骨料混凝土轴压短柱力学性能实验结果,提出轻骨料混凝土轴对称三轴受压轴向应力-应变关系,应用连续介质力学,确立圆钢管轻骨料混凝土同心圆柱体共同受压时的计算模型,建立了圆钢管轻骨料混凝土组合弹性模量理论计算公式和组合应力-应变关系的理论表达式,编制相应计算程序.结果表明,核心混凝土由于受钢管约束,其纵向应力有较大提高,延性得到显著改善,钢管在为轻骨料混凝土提供径向约束的同时,其纵向应力大幅降低;钢管对轻骨料混凝土的约束效果要低于对普通混凝土的约束效果.通过大量参数分析,得到钢管轻骨料混凝土轴压短柱极限承载力计算公式和组合应力-应变关系全曲线,计算与实验结果吻合良好.Based on the experimental results of mechanical properties of lightweight aggregate concrete filled circular steel tubular（LCFST） stub columns under axial compression,the axial stress-axial strain relations of concrete under axisymmetric triaxial compression were proposed.Based on continuum mechanics,the calculation model for LCFST stub columns of concentric cylinders of circular steel tube with concrete core under concentrically loaded conditions was determined.The theoretical calculation formulas for composite elastic modulus and composite stress-strain relations of the stub columns were presented.A FORTRAN program for the elasto-plastic analysis of LCFST stub columns under concentric loading was developed.The reliability of the present method and program was validated by the test results from references.The behavior of LCFST stub columns was analyzed.The analysis results indicated that for confinement by steel tube,the axial stress of lightweight aggregate concrete core increased greatly and the ductility was improved,while the axial stress of steel tube decreased rapidly for confinement effect.Compared with normal concrete filled circular steel tubular（CFST） stub columns,the confinement effect of LCFST stub columns was weakened.Through parameters analysis,a practical calculation formula for the bearing capacity and the composite stress-strain relations of LCFST stub columns were obtained.The analysis results consistent with the experiment ones from references.

关 键 词：钢管轻骨料混凝土柱 力学性能 弹塑性法 极限承载力 组合应力-应变关系 

分 类 号：TU398[建筑科学—结构工程]