方钢管混凝土轴压短柱的力学性能

Mechanics Behavior of Axially Loaded Short Columns with Concrete-Filled Square Steel Tube

根据统一强度理论,综合考虑了方钢管混凝土的材料特点,引入了考虑厚边比影响的等效约束折减系数,将钢管混凝土角部非均匀的约束力转化为均匀的约束力,从而将方钢管对混凝土的约束等效为圆钢管对混凝土的约束。在厚壁圆筒的统一强度理论解的基础上,推导了计算钢管混凝土极限承载力的公式,并用该公式对文献资料数据进行了计算对比。结果表明:该公式有很强的适用性,对发挥材料潜力、节约材料很有意义。

Authors took the material characteristic of concrete-filled square steel tube （CFSST） into consideration and turned the corner non-uniform confinement force of CFSST to its corner uniform confinement force through the equivalent reduction factor, which considered the thickness side ratio effect, based on the unified strength theory. Thus, the non-uniform confinement force of square steel tube to its core concrete could be turned to the uniform force of equivalent circular steel tube. Based on unified strength theory solutions of thick tube, authors deduced the formula for calculating ultimate bearing capacity of concreteffilled steel tube. Formula solutions was testified by test results of reference. The applicability of the formulas was testified. The result shows that the formulas have significance in exerting material potential and saving material.