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

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.

Key words:structure composed of steel truss and square concrete filled tubular column; failure modes; simplified analytical model; test verification; loaddisplacement relationship; bearing capacity