Seismic Behavior Analysis of Steel-Concrete Composite Frame Structure Systems

Abstract eng:
To investigate seismic behavior of steel-concrete composite frame structures, based on researches of composite beams and connections between beams and columns, a 4 poly-line plastic hinge mode is suggested for the inelastic analysis of composite frames. And CL-CFST (composite beam-concrete filled square tubular column), SL-CFST (steel beam-concrete filled square tubular column), CL-ETRC (composite beam-equivalent stiffness RC column), SL-ETRC (steel beam-equivalent stiffness RC column) and RC frame structures are separately created. Then the mode analysis, the response spectrum and the inelastic analysis under rare earthquakes are carried out. The analysis results illustrate that, compared with the SL-CFST frame, the integral stiffness of the CL-CFST frame is enhanced; natural periods are shortened; the top deflection of and the storey-drift-angle are decreased, after considering the composite effect of RC floor slabs. But because of the increase of the stiffness of composite beams, the integral stiffness of the structure and the linear stiffness ratio of beam and column are also changed, which probably makes not only the column damaged heavily but also the weak section transferred. And compared with the CL-RC frame, under rare earthquakes, RC columns can not satisfy the demand of “no collapsing with strong earthquake”. And after increasing dimensions and reinforcement ratios of columns, the plastic hinge is also found at the end of columns. According to the above comparisons, as a whole, the CFST frame structure has qualified aseismic performance. But the effect which composite frame beams have on structural seismic behavior should be considered comprehensively.

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