钢管钢骨高强混凝土压弯柱全过程分析

Full-range analysis of steel tube columns filled with steel-reinforced concrete subjected to compression-flexure loading

为了研究钢管钢骨高强混凝土组合柱的压弯性能,采用试验和非线性全程分析的计算程序,对工字形钢骨的钢管钢骨高强混凝土组合构件进行研究.试验主要参数为轴压比(n=0.5～0.85)和钢骨的不同加载方向(强轴和弱轴).研究结果表明:荷载-挠度典型曲线表现为弹性、弹塑性和破坏的三阶段特征;承载力随轴压比的增加而减小,随截面惯性矩的增加而呈现非线性增长;峰值点挠度随轴压比和加载方向的不同没有明显变化;组合柱符合平截面假定,挠度曲线符合正弦半波分布.纤维模型法编制的非线性分析程序与试验结果吻合较好,并采用此程序系统地分析了轴压比、长细比和混凝土强度等参数对压弯构件荷载-变形曲线全过程的影响.

In order to study the compression-flexural performance of steel tube filled with steel-reinforced high-strength concrete（STSRHC） members,the compression-flexural behavior of I shape of STSRHC were studied by experimental research and non-linear full-range compute program.The parameters in the study include the ration of axial compression（n=0.5-0.85） and different loading direction of steel-reinforce（major axis and minor axis）.The results showed that the typical curve of load-deflection have elastic,elastic-plastic and failure three stages.Bearing capacity of composite column decrease with the increase of axial compression ratio,and increase with the moment of inertia nonlinear increase.The peak deflection isn＇t different with the axial compression ratio and loading direction.The composite member is up to plane section assumption;The deflection of member is up to sine curve.The non-linear compute program by fiber model goes well with the experimental result,and axial compression ratio,slender ratio and strength of concrete are studied on the full-range of load-deflection.