Comparative Study of Nonlinear and Equivalent Linear Site Response Analysis in Kathmandu Valley Soil
摘要
Site response, the complex interactions between local geology and soil characteristics, significantly influence how seismic waves move through and interact with the different strata of the soil. Various analytical techniques can derive surface ground motions, including one-dimensional numerical simulations that are equivalent-linear (EL) and nonlinear (NL) analysis methods. There would be a challenge in selecting an analysis approach due to the variation of different input parameters. This comparative study assessed data from six different location borehole logs and four ground motions of varying magnitude. One-dimensional analysis module DEEPSOIL was used to evaluate the response analysis of selected sites. The results obtained were interpreted on variations of peak ground acceleration (PGA), spectral acceleration (Sa), time period, and amplification factor (AF) from EL and NL approaches. Considerable variations have been observed in the findings derived from linear equivalent and nonlinear analysis techniques.