钢管钢骨高强混凝土抗弯构件试验研究

Flexural members of steel tube filled with steel-reinforced high-strength concrete

摘要:

为了研究钢管钢骨高强混凝土组合构件的抗弯性能,采用抗弯试验研究方法和统一理论的计算方法,对工字形钢骨的钢管钢骨高强混凝土构件进行了抗弯的理论和试验研究.试验主要参数为配骨指标(ρ=0.3～0.6)和钢骨的不同加载方向(强轴和弱轴).试验表明:极限弯矩值随配骨指标的增加呈非线性增长,当配骨指标一定时,极限弯矩值随惯性矩的增加按比例增加,弱轴跨中变形大于强轴;组合构件符合平截面假定,挠度曲线符合正弦半波分布;钢管和钢骨对混凝土的紧箍作用强轴高于弱轴,且随配骨指标的减小而增加.在试验分析的基础上,建立组合构件抗弯承载力计算公式,计算结果与试验结果吻合良好.

Abstract:

In order to study the flexural performance of members of steel tube filled with steel-reinforced highstrength concrete (STFSC),experimental and theoretical researches on the flexural behavior of 5 I shape of STFSC were carried out.The parameters in the study include the steel-reinforced index ρ=0.3-0.6 and different loading directions of steel-reinforce.The results indicate that bearing capacity of composite member nonlinearly increases with the increase of steel-reinforced index,but it linearly increases with the moment of inertia and the deformation of minor axis is bigger than that of major axis when the steel-reinforced index is determined.Composite member accords with plane section assumption,and the deflection of member fits for sine curve.The major axis of confining force of steel tube and steel-reinforce to concrete is more obvious than its minor axis,and the confining force is increased with the decrease of steel-reinforced index.Based on the experimental analysis,formula of bearing capacity of flexure is built,and a good agreement is obtained between calculating results and experimental results.