A DYNAMIC CAPACITY CURVE APPROACH AND ITS APPLICATION TO THE SEISMIC EVALUATION OF STRUCTURES
DOI:
https://doi.org/10.18867/ris.110.620Keywords:
dynamic capacity curve, approximate procedures, incremental dynamic analysis, modal spectral analysis, seismic performanceAbstract
This paper presents a simplified procedure for the seismic evaluation of structures based on the dynamic capacity curve and its validity as a structural property associated to a seismic demand. The proposed procedure calculates the performance of a structure subjected to seismic demands corresponding to a uniform hazard spectrum through an approximation of the dynamic capacity curve constructed from modal spectral analyses associated to increasing intensity demands. To considering stiffness reduction and energy dissipation due to hysteresis, a one-degree-of-freedom oscillator with the characteristics of the fundamental mode is solved. The approximation of the dynamic capacity curve obtained from the proposed procedure is validated by comparing it with the obtained from step-by-step dynamic analyses under increasing intensity demands, for two reinforced concrete structures, a 12-story plane frame irregular in elevation, and a continuous viaduct-type bridge.
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