方形、矩形钢管高强混凝土受弯构件的理论分析与试验研究

EXPERIMENTAL RESEARCH AND THEORETICAL ANALYSIS ON FLEXURAL BEHAVIOR OF HIGH-STRENGTH CONCRETE-FILLED SQUARE AND RECTANGULAR STEEL TUBES

基于从试验中剥离出来的混凝土和钢材的应力 -应变关系 ,采用数值分析的方法对方形、矩形截面钢管混凝土受弯构件的力学性能进行了分析。同时 ,进行了 6根方形、矩形钢管高强混凝土受弯构件的试验研究 ,研究构件纯弯段的受力性能 ,并与理论分析结果进行了对比 ,发现两者吻合较好。在此基础上 ,利用程序分析了钢材的屈服强度、混凝土强度、含钢率、截面长宽比对构件抗弯性能的影响。

A calculation program based on numerical analysis was developed,which can calculate the moment curvature interaction curve of concrete filled square and rectangular steel tubes The stress strain models of the steel and core concrete used were separated from the experimental results of the axially compressive short columns At the same time,6 high strength concrete filled square and rectangular steel tubular members were tested to investigate the pure flexural behavior Compared with experimental results,the numerical analysis results were found to agree well with the former Furthermore,the influences of steel yielding strength,concrete strength,steel ratio and length width ratio of a section etc on the bending property of the members were analyzed using this program At last,a typical curve of pure flexural member is given