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双管圆形钢管混凝土构件(CFDST)具有由共圆心的2个圆形钢管间填充混凝土组成的中空截面。因此,CFDST构件比一般的实心钢管混凝土(CFT)构件轻。本文的目的是通过三点静力荷载试验研究CFDST深梁在弯剪作用下的力学性能。考虑了内外管径比(Di/Do)和外管径厚比(Do/to)两个参数的影响。结果表明:失效模式由参数Di/Do控制。Di/Do小于0.47构件的试验强度与预估值能较好地吻合。另外,讨论了双管在平面应力条件下的双轴弹塑性应力历程。
The double-pipe, circular CFST has a hollow section composed of two circular steel-pipe filled concrete with a total of center. Therefore, CFDST components are lighter than typical solid concrete-filled concrete (CFT) components. The purpose of this paper is to study the mechanical behavior of CFDST deep beam under the effect of bending and shearing by three-point static load test. The effects of two parameters, Di / Do ratio and Do / to ratio, are considered. The results show that the failure mode is controlled by the Di / Do parameter. The test intensity of Di / Do less than 0.47 is in good agreement with the predicted value. In addition, biaxial elasto-plastic stress history of double tube under plane stress is discussed.