WRC-T钢管混凝土短柱轴心受压力学性能

目的 了解WRC-T钢管混凝土柱的破坏形态、受力和变形性能,考察约束效应系数、长细比、肢长腹比等参数的影响,探讨极限承载力计算方法 .方法 设计制作20个WRC-T钢管混凝土短柱试件,通过轴心受压试验,实测试件的荷载-变形曲线和极限承载力,分析各参数对短柱轴心受压力学性能的影响,参考国内外相关规范条文,通过试验数据回归分析,提出WRC-T钢管混凝土短柱轴心抗压极限承载力的计算模型.结果 试件呈剪切型或局部凸曲型破坏,提高约束效应系数可以明显提高试件的极限承载力和后期承载能力.结论 WRC-T钢管混凝土短柱的两个组成部分能很好地协同工作,力学性能较好;极限承载力公式计算结果 与试验值符合较好;计算公式可供工程设计参考.

Experiment of WRC-T Concrete Filled Steel Tubular Short Columns Mechanical Property under Axial Compression

In order to know the destruction form,mechanical and distortion property,we consider several influence factors include the constraint factor,ratio of length to diameter and ratio of length to-sternum of member,and discuss the formula for the ultimate bearing capacity.20 WRC-T concrete-filled steel tube short columns were designed and manufactured.Axial compression test was carried out,the load-deformation relationship curves and ultimate bearing capacity were tested and the effect of each influence factor impact the pressure mechanic properties of this kind short column was analyzed.In this paper,based on the conclusion of domestic and foreign codes,the formula for the axial compression bearing capacity of WRC-T concrete-filled steel tubular columns was deduced through the regression analysis of experimental data.The failure modes were shear failure and the local buckling failure,the ultimate bearing capacity and later bearing capacity can be heightened obviously by increasing the constraint factor.The WRC-T concrete-filled steel tube short column which is composed of two rectangular steel tube columns can just work together very well and mechanical property is steady.The calculated results by the formula coincide with the experimental results so well that the formula can be valuable to the engineering design.