Abstract
In order to propose a seismic design spectrum that includes the effect of rupture directivity in the near-fault region, this study investigates the application of equivalent pulses to the parameter attenuation relationships developed for near-fault, forward-directivity motions. Near-fault ground motions are represented by equivalent pulses with different waveforms defined by a small number of parameters (peak acceleration, A, and velocity V; and pulse period, T v ). Dimensionless ratios between these parameters (e.g., AT v /V, VT v /D) and response spectral shapes and amplitudes are examined for different pulses to gain insight on their dependence on basic pulse waveforms. Ratios of AT v /V, VT v /D, and the ratio of pulse period to the period for peak spectral velocity (T v-p) are utilized to quantify the difference between rock and soil sites for near-fault forward-directivity ground motions. The AT v /V ratio of recorded near-fault motions is substantially larger for rock sites than that for soil sites, while T v-p/T v ratios are smaller at rock sites than at soil sites. Furthermore, using simple pulses and available predictive relationships for the pulse parameters, a preliminary model for the design acceleration response spectra for the near-fault region that includes the dependence on magnitude, rupture distance, and local site conditions are developed.
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Supported by: International (Regional) Cooperative Research Program of China National Natural Science Foundation Under Grant No. 50420120133 and Heilongjiang Natural Science Foundation Under Grant No. ZGJ03-03
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Xu, L., Rodriguez-Marek, A. & Xie, L. Design spectra including effect of rupture directivity in near-fault region. Earthq. Engin. Engin. Vib. 5, 159–170 (2006). https://doi.org/10.1007/s11803-006-0636-8
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DOI: https://doi.org/10.1007/s11803-006-0636-8