Pérez Rivera, Anthony

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    Effects of high frequency ground motion spectra in the seismic response of squat RC walls
    (2016) Pérez Rivera, Anthony; Vidot Vega, Aidcer L.; College of Engineering; Suárez, Luis E.; Montejo Valencia, Luis A.; López Rodríguez, Ricardo R.; Department of Civil Engineering; Lorenzo González, Edgardo
    Recent regulations in the nuclear industry have imposed the consideration of high frequency ground motion effects in the construction and evaluation of nuclear power plants. The uniform hazard spectra used for Central and Eastern United States (CEUS) hard rock sites have changed due to these recent regulations. Typical ground motion response spectrum at CEUS rock sites has high frequency content as opposed to a typical design spectral shape. The dominant spectral amplification values in the CEUS spectrum tend to be reached in the 20-40 Hz range while in typical design ground motion spectrum for nuclear power plant facilities these values are reached in a lower frequency range (2-10 Hz). The purpose of this investigation is to study the seismic response of squat reinforced concrete (RC) walls subjected to seismic ground motions with response spectra having acceleration amplifications in the high frequency zone. Three nonlinear models of squat RC walls are analyzed considering three different typical ground motion response spectrums with spectral amplifications varying in the high frequency range. Incremental dynamic analyses are performed to these walls subjected to acceleration time histories compatible with the selected spectra in order to analyze the effects of the high frequency content in their seismic response. An exhaustive evaluation is performed considering several performance indicators at different damage levels such as displacements, drifts, spectral accelerations at fundamental periods, and base shears. The spectrum that has dominant spectral acceleration amplification values toward the highest frequency range tend to produce the lowest drifts or the less demand in the wall specimens considered in this research.