局部承压的圆形钢管混凝土构件试验

在很多桁架和网格结构中,钢管混凝土(CFST)构件都承受局部压力作用。以往的研究主要集中在这种荷载条件下的矩形CFST构件的性能,但是缺少对受局部承压力的圆形钢管混凝土构件的认识。文章意图填补这个领域的空白。对圆形钢管混凝土构件进行一系列试验,对无填充的圆钢管和素混凝土样本施加局部承压力。垂直加裁或呈45℃加载于构件上。由于荷载-变形曲线显示了其延性,采用一种变形极限来确定样本的极限强度。根据试验结果研究几种重要参数的影响。最后,提出可以预测局部承压的圆形钢管混凝土构件极限强度的设计公式。

Concrete-Filled Circular Steel Tubes Subjected to Local Bearing Force : Experiments

Concrete filled steel tubular (CFST) members are subjected to local bearing forces in a large number of truss and lattice structures.Previous research has focused on rectangular CFST members under such loading condition. There is a lack of understanding on circular CFST members subjected to local bearing force.This paper intends to fill the knowledge gap in this area.A series of tests were conducted on circular CFST , unfilled circular hollow section (CHS) steel tube and plain concrete specimens loaded with local bearing force.The load was applied either perpendicularly to the member or at an angle of 45°.A deformation limit was adopted to define the ultimate strength of the specimen since the load verse deformation curve exhibits a ductile behavior.The effects of important parameters were investigated based on the test results.Finally , design formulae were developed to predict the ultimate strength of circular CFST members under local bearing forces.