Near Field Experimental Seismic Response Spectrum Analysis and Comparison with Algerian Regulatory Design Spectrum

Abstract eng:
In this study, near field experimental seismic response spectra are computed based on the main shock and numerous aftershocks recorded during and after the May 21 Boumerdes earthquake with magnitude from 3.8 to 6.8. Large strong motion data base (East- West, North-South, and Vertical) is recorded by the Algerian accelerograph network monitored by the earthquake engineering research center. Two stations, located in near field, are used for this study: Keddara and Boumerdes stations. Results show a high frequency content in near field and a clear underestimate of the RPA99 design spectra in high frequencies. A clear frequency shift is evidenced on the horizontal component compared to the vertical one. Also, a directionality effect is evidenced particularly at keddara station around 10 Hz where the north south mean spectral amplitude is higher than the east west one. Finally, a comparison between Keddara and Boumerdes East-West, North-South and vertical horizontal mean elastic response spectrum shows higher spectral amplitude in Boumerdes up to 8 Hz for both horizontal and vertical components.

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