方钢管混凝土柱钢桁架结构破坏模式分析

Analysis on Failure Modes of The Structure of Steel TrussSquare Concrete Filled Tubular Column

摘要:

基于叠加原理，假定钢桁架与钢管混凝土柱的变形互不耦合，提出针对这种框架的节点子结构受力机理简化分析模型并采用试验验证.其中，钢桁架的荷载位移曲线由铰接机制、刚接机制叠加得到；钢管混凝土柱的荷载位移曲线则基于弯矩曲率方程与等效剪切刚度计算得到.通过对钢桁架、方钢管混凝土柱承载力的分析，可判断结构的破坏模式与承载力.简化模型预测的破坏模式、荷载位移曲线均与试验结果吻合较好，承载力与试验值接近.针对方钢管混凝土柱钢桁架结构的不同破坏模式，还对其与抗震性能的相关性做了进一步的探讨.

Abstract:

Assumed the deformation of steel truss and concrete filled tubular (CFT) column were independent, a simplified analytical model on the bearing mechanism of the joint sub assembly was proposed based on the superposition principle. And the test verification with the results obtained by the model was conducted. In the model, the steel truss was considered as a combination of the hinge and rigid mechanism, and the loaddisplacement relationship of the CFT column was calculated according to the momentcurvature equation and the equivalent shearing stiffness. Failure modes and bearing capacity could be identified according to the analysis. The predicted loaddisplacement relationship and failure modes had good agreements with the test, and the predicted bearing capacity was also close to the test. From the view of seismic performance, some discussions on the different failure modes of the structure were made in the presented paper.