Development of site specific equivalent linear seismic ground response for Abbottabad, Pakistan
Keywords:
Linear ground response modelling; Ground response spectrum; Amplification factor; Peak Ground Acceleration (PGA).Abstract
The site specific seismic hazard was conducted at three different selected locations in Abbottabad, Pakistan. The site response was modeled using one dimensional analysis technique with data from site investigation from three selected locations from Abbottabad. Based on shear wave velocity, as per Building Code of Pakistan-2007 all the three locations were identified as stiff soil profile (SD). The seismic ground motions applied at the base of model were selected from worldwide database compatible to the seismic hazard of Abbottabad. The model used equivalent linear analysis approach, incorporating non-liner shear modulus degradation and damping curves for plastic soils. The analysis results for all sites showed amplification of input motions in term of surface response spectrums. The lowest surface amplification was obtained for site with highest fundamental natural period. Furthermore, the Peak Ground Acceleration (PGA) values showed increased toward surface. The strong amplitude short period motion was comparatively more amplified among suite motions and thus resulted in higher surface PGA value
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