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进行了10个方钢管-钢骨高强混凝土单向偏压柱的试验研究,研究其破坏形态及工作机理,分析在不同长细比、偏心率、配骨指标及不同加载方向条件下偏压柱的力学性能。结果表明:在试验参数范围内,偏压柱的承载力随长细比的增加缓慢下降,初始刚度迅速减小;偏心率的增长导致承载力降低,初始刚度减小;配骨指标的增加使构件的承载力逐渐增长;强、弱轴两个加载方向对承载力及初始刚度的影响不明显。利用纤维模型法编制了偏压柱非线性分析程序,计算结果与试验结果吻合较好。在此基础上,通过计算分析了主要参数对承载力的影响。最后,通过对大量计算结果的回归,得出了实用的偏压承载力计算公式,计算结果与试验结果吻合较好。
Ten square steel tube-steel reinforced high-strength concrete columns under uniaxial compression were studied, and their failure modes and working mechanism were studied. The effects of different slenderness, eccentricity, The mechanical properties. The results show that the bearing capacity of the biased column decreases slowly with the increase of the slenderness ratio, and the initial stiffness decreases rapidly. The increase of the eccentricity leads to the decrease of the bearing capacity and the decrease of the initial stiffness. The bearing capacity of the members gradually increases; the influence of the two loading directions of strong and weak shafts on bearing capacity and initial stiffness is not obvious. The non-linear analysis program of bias columns was made by using the fiber model method. The calculated results are in good agreement with the experimental results. Based on this, the influence of the main parameters on the bearing capacity is analyzed and calculated. Finally, through the regression of a large number of calculation results, a practical calculation formula for the bearing capacity of the biasing force is obtained. The calculation results are in good agreement with the experimental results.