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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。
In many truss and grid structures, CFST members are subject to localized pressure. Previous studies mainly focused on the performance of rectangular CFST members under such load conditions, but lacked a recognition of circular CFST members subjected to local bearing pressures. The article intends to fill the gap in this area. A series of tests on circular CFST members were carried out to apply local bearing pressure on unfilled circular steel tubes and plain concrete specimens. Vertical plus cut or 45 ℃ loaded on the components. Since the load-deformation curve shows ductility, a deformation limit is used to determine the ultimate strength of the specimen. According to the experimental results of several important parameters of the impact. Finally, the design formula that can predict the ultimate strength of CFST members under partial pressure is proposed.