Analysis of site amplification of earthquake ground motion at Mongla port, Bangladesh
Md. Asiful Islam*, Md. Rokonuzzman
The site amplification of Mongla port based on shear wave velocity is estimated.
DEEPSOIL program is used for estimating peak ground acceleration.
The characteristics of seismic ground response and normalized response spectra are studied.
The average value of shear wave velocity is 194 m/s.
The Mongla port is classified as Site-D according to IBC.
Seismologists usually define strong ground motion as the strong earthquake shaking that occurs close to a causative fault. Ground motion is produced by waves that are generated by a sudden slip on a fault or sudden pressure at the explosive source and travel through the earth and along its surface. The aim of this research is to estimate the site amplification of Mongla port based on shear wave velocity. For estimating peak ground acceleration, DEEPSOIL program was used. With soil layer depth, bulk density and damping as inputs, peak ground acceleration by linear analysis was conducted. Four input motions such as Chi Chi earthquake, Kobe earthquake, Northridge earthquake and Loma Gilroy earthquake are recorded in rock in this analysis, which are scaled to 0.12g value. Improved spectral amplification factors for different site conditions based on an extensive theoretical and experimental study were used. The characteristics of seismic ground response and comparison of normalized response spectra with the BNBC seismic code are also studied. The average value of shear wave velocity is 194 m/s and Mongla port is classified as Site-D according to IBC. The study will help to provide a guideline for reclamation procedure to minimize seismic hazards of reclaimed areas and to suggest the suitable ground improvement techniques for such areas.
To cite this article: Islam MA, Rokonuzzman M. Analysis of site amplification of earthquake ground motion at Mongla port, Bangladesh. Journal of Advanced Civil Engineering Practice and Research 2019;9:13-24.