Abstract
Concrete filled steel tubular (CFST) structures have obtained application in China for their outstanding features. In recent decade, the application has also been extended to high rise buildings with 28 to 66 stories and arch bridges with span of 100 to 420 meters. The dynamic behavior study on CFST structures is still in a stage of experiment study. Experiment is made on specimens with various shears to span ratios and under cyclic compression, bending, and shear loadings. Based on the experiment result, some experimental formulas about ductility coefficient are developed. This chapter proposes the theoretical research results of dynamic behaviors of CFST members. By use of finite element method, the hysteresis curves and skeleton curves of moment-curvature and load-displacement (P-A) of CFST member were first calculated. The models of these curves were established, and the simplified formulas of the displacement ductility coefficient were proposed. The calculated results agree with test results very well. In ordinary situations, there is no need to control the axial compression ratio of CFST column.
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