钢管混凝土桁架脱空影响分析

Debonding Analysis of Concrete Filled Steel Tubular Trusses

钢管混凝土具有承压性能好的优点,当其应用在杆件以承受轴力为主桁架结构中时可充分发挥二者的结构特点,但管内混凝土脱空会影响其力学性能的发挥。为对脱空影响进行分析,建立了不同脱空程度的ABAQUS桁架有限元模型,对其正常使用阶段的力学性能进行了对比,结果表明钢管混凝土脱空对桁架杆件应力水平以及抗弯刚度均有不同程度的影响。

Concrete-filled steel tube has the advantages of good compression performance.When it is used in the truss structure to bear the axial force,it can give full play to the structural characteristics.The debonding of the concrete in the tube will affect its mechanical performance.In order to analyze the impact of debonding,this paper established ABAQUS truss finite element models with different debonding levels,and compared their mechanical properties during service stage.The results showed that the debonding of concrete affects the stress level and flexural stiffness of the truss.