轴向压缩荷载下双层中空钢管混凝土短柱的试验和数值研究

使用试验和数值方法研究轴向压缩荷载下双层中空钢管混凝土柱的性能。对一个外层为八边形钢管﹑内层为环形PVC-U管﹑且在两层间填充高强混凝土的双层中空钢管混凝土柱进行研究。测试混凝土强度﹑径厚比﹑空心率﹑长细比对双层钢管混凝土柱的极限轴压承载力的影响。经测试发现:双层中空钢管混凝土柱的极限轴压承载力随着混凝土强度的增加而增加,但随着径厚比或空心率的增加而减少。根据试验结果,提出一个能预测双层中空钢管混凝土柱极限轴压承载力的设计公式。

Experimental and Numerical Studies of Short Concrete-Filled Double Skin Composite Tube Columns Under Axially Compressive Loads

This paper presents a study on the performance of concrete-filled double skin composite tube columns (CFDSCT) under axially compressive loads using both experimental and numerical methods. The CFDSCT column investigated consists of an octagonal steel tube as its outer skin layer, a circle PVC-U pipe as its inner skin layer, and high strength concrete filled in between the two layers. Influences of concrete strength, radius-to-thickness ratio, hollow section ratio, and slenderness ratio on the ultimate axial compressive capacity of the CFDSCT column are examined. It is found that the ultimate axial compressive capacity of the CFDSCT column increases with the strength of concrete, but decreases with either increased radius-to-thickness ratio or increased hollow section ratio. Based on the findings from the present experimental and numerical studies, a design formula for predicting the ultimate load of the CFDSCT column is proposed.