摘要
为研究HRB500钢筋混凝土Z形截面双向压弯柱的受力性能,采用Fortran语言编制Z形截面双向压弯柱承载力有限元计算程序,基于已进行的9根钢筋混凝土Z形截面柱试件反复加载试验结果,对程序的正确性进行验证,试验结果与计算结果吻合较好。分析了加载角度、混凝土强度等级、纵筋配筋率、轴压比和肢高肢厚比等参数对承载力的影响,得到了Z形截面双向压弯柱正截面轴力-弯矩(N-M)及双向弯矩(Mx-My)相关曲线的变化规律。研究结果表明:在轴压比、纵筋配筋率、肢高肢厚比满足限值的条件下,界限破坏时,混凝土强度等级由C45提高到C60,受弯承载力提高15.1%,受压承载力提高21.1%;配筋率由1.57%提高到2.26%,受弯承载力提高15%,受压承载力降低10.8%,加载角度对界限破坏点没有影响。配置HRB500纵筋Z形截面柱,混凝土强度等级不宜小于C50。
In order to study the mechanical performance of HRB500 RC Z-shaped columns subjected to biaxial bending and compression,a computer program aiming at obtaining the bearing capacity of Z-shaped columns under biaxial bending and compression was compiled with Fortran language,and the bearing capacity of 9 RC Z-shaped columns under low cycle reversed loading were investigated by test. The program was verified to be correct. The analytical results are in good agreement with the test results. The parameters affecting the bearing capacity of the Z-shaped columns,including the loading angle,the concrete strength,the ratio of longitudinal reinforcement,the ratio of axial compression and the ratio of limb depth-to-thickness were studied,and the variation law of N-M and Mx-Myinteractive curves on the normal section of Z-shaped columns under biaxial bending and compression was obtained. The research results indicate that when abiding by the code limits in terms of compression ratio,reinforcement ratio and limb depthto-thickness ratio,the concrete strength grade is increased from C45 to C60,the flexural bearing capacity improved by 15. 1%,the compression bearing capacity increased by 21. 1%. When the reinforcement ratio is increased from 1. 57% to 2. 26%,the flexural bearing capacity improved by 15%,and the compression bearing capacity reduced by 10. 8%. The load angle has no effect on the critical failure point. The concrete strength grade shall not be less than C50 when HRB500 steel bars are used as longitudinal reinforcement of RC Z-shaped columns.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2014年第S1期119-125,共7页
Journal of Building Structures
基金
国家自然科学基金项目(50879079)
住房和城乡建设部规程修订项目
