方钢管-钢骨高强混凝土偏压柱试验研究与理论分析

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。图12表2参8

Experimental research and theoretical analysis of square steel tube columns filled with steel-reinforced high-strength concrete subjected to eccentric loading

An experimental research of 10 square steel tube columns filled with steel-reinforced high-strength concrete subjected to eccentric loading was carried out. Faigure modes and mechanical properties were studied corresponding to different parameters such as slenderness ratios, eccentricity ratios, steel-reinforced ratios and loading direction. The experimental results show that the bearing capacity decreases slowly and the initial stiffness decays sharply with the increase of the slenderness ratios. The increment of eccentricity ratio leads to the decrement of both the bearing capacity and the initial stiffness. The increase of steel-reinforced ratios results in the bearing capacity and initial stiffness rise gradually. Loading direction has little effect on bearing capacity and initial stiffness. The experimental results agree well with analyses using a nonlinear program developed by using fiber model method. The primary parameters influencing the bearing capacity were investigated. Based on the numerical analysis, a formula for predicting the capacity of eccentrically-loaded columns is suggested.