Analytical Fragility Research on RC Frame-Core Tube Structures With An Optimum Intensity Measure

Abstract eng:
：In this paper, the analytical seismic fragility relations of RC high-rise frame-core tube structures is derived with an improved intensity measure (IM). As reference buildings, nine typical RC frame-core tube structures with varying height, width of building plan and seismic fortification levels (SFL) are designed and numerically modeled for conducting nonlinear dynamic time history analysis. To ensure sufficiency and efficiency for IM, which is the geometric mean of spectral acceleration over a certain period range in the study, an optimization algorithm is developed to select the period range. Consequently, the comparison of this optimal spectral value with traditional IMs exhibits a substantial reduction in correlation with seismic parameters (sufficiency) and in dispersion with respect to structural response (efficiency). Then the fragility curves are obtained based on the defined damage states that are consistent with current seismic design code. The impact of aspect ratio and seismic fortification levels on the fragility relationships are also investigated. As expect, no significant trends were observed between structural seismic fragility and aspect ratio including both height and width of building plan, while seismic fortification level has a great impact on fragility assessment.

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