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对受弯状态下由钢管混凝土弦杆和空腹桁架组成的曲线形钢管混凝土(CCFST)进行一系列试验。对4个曲线形钢管混凝土桁架、2个直钢管混凝土桁架(简称为钢管混凝土桁架)和2个曲线形空心管桁架进行试验,从而研究矢跨比和内填混凝土对曲线形钢管混凝土桁架抗弯性能的影响。发现了不同的失效模式:钢管混凝土桁架的弯曲失效;曲线形钢管混凝土桁架的弯剪失效;空心管桁架的局部屈曲失效。试验结果显示,曲线形钢管混凝土桁架的刚度和承载能力要大于钢管混凝土桁架,但曲线形钢管混凝土桁架的延性相对较低,产生了节点失效。同时,内填混凝土有助于增加钢管桁架的刚度、承载能力和延性。建立一个曲线形钢管混凝土桁架的有限元模型并通过试验结果验证。根据这个模型全面研究分析桁架的力学性能。提出一个可以预测弹性刚度、考虑弯曲变形和剪切变形的简化模型。也对曲线形钢管混凝土结构的承载能力进行了讨论。
A series of tests were carried out on Curved Concrete Filled Steel Tube (CCFST) consisting of CFST chords and webs under bending. Four curved concrete-filled steel tubular trusses, two straight concrete-filled steel trusses (CFST trusses) and two curved hollow trusses were tested to study the effects of ratio of cross-over and concrete on the flexural behavior of curved concrete filled steel tubular trusses The impact of performance. Different failure modes were found: bending failure of CFST truss; failure of bending and shearing of CFST truss; and local buckling failure of hollow tube truss. The experimental results show that the stiffness and bearing capacity of curved CFST truss are greater than that of CFST truss, but the ductility of curved CFST truss is relatively low, resulting in node failure. At the same time, the filling of concrete helps to increase the stiffness, load carrying capacity and ductility of the steel truss. A finite element model of a concrete filled steel tubular trussed truss was established and verified by the test results. According to this model, a comprehensive study of the truss mechanical properties. A simplified model that can predict elastic stiffness, consider bending deformation and shear deformation is proposed. The carrying capacity of curvilinear CFST structure is also discussed.