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试验共对8根钢管钢骨高强混凝土偏心受压组合柱进行了测试,研究了不同参数情况下,组合柱承载力性能变化,研究结果表明:承载力随着偏心距增大而减小,且对极限值影响很大;承载力随着长细比的增加而减小,并呈现非线性,降低幅度逐渐增大;组合柱侧向挠度随着长细比增加而增加,在80%极限荷载左右开始变化明显,基本符合正弦半波曲线;内部钢骨和外部钢管对混凝土形成双重紧箍力,明显提高核心混凝土的抗压强度,且抗压强度的提高幅度与内部钢骨的布置形式有直接关系;在试验和理论研究的基础上,建立组合柱的偏压承载力计算公式,计算结果与试验结果吻合良好。
In the experiment, a total of eight steel reinforced high-strength concrete-filled columns under eccentric compression were tested. The bearing capacity of composite columns under different parameters was studied. The results show that the bearing capacity decreases with the increase of eccentricity The bearing capacity decreases with the increase of the slenderness ratio and appears non-linear, and the decreasing amplitude gradually increases. The lateral deflection of the composite column increases with the slenderness ratio, and at the ultimate load of 80% Which is consistent with the sine half-wave curve. The internal steel and external steel pipes form a double tight-binding force on the concrete, which obviously improves the compressive strength of the core concrete. The increase of the compressive strength and the arrangement form of the internal steel are Based on the experimental and theoretical research, the formulas for calculating the bearing capacity of composite columns are established. The calculated results are in good agreement with the experimental results.