Effect of earthquake duration on the inelastic response of reinforced concrete structures
DOI:
https://doi.org/10.21703/0718-2813.2009.7.3723Keywords:
earthquake duration, acceleration scaling, damage, reinforced concrete structuresAbstract
This study investigates the relationship between damage and earthquake duration. For this purpose, a computational program was use to analyse a 4-story RC frame subjected to 40 strong-motion records of different durations and intensities. The inelastic response analysis was performed based on four parameters of damage: the maximum displacement on the top floor, the maximum relative displacement between floors, the dissipated hysteresis energy and the accumulated ductility. The duration proposed by Somerville et al.(1997), defined as the interval between the 5% and the 75% of the Arias Intensity, was used. The seismic records were scaled so that all have the same level of spectral acceleration for the fundamental period of the structure under study. The spectral acceleration was chosen by the design spectrum obtained from the Chilean Standard NCh433 Of.96. It is concluded that for damage parameters based on displacements there is not effect of duration. However, accumulative damage parameters depend strongly on the earthquake duration.
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