Suya doygun zemin profillerinde doğrusal olmayan efektif gerilme analizleri yoluyla dinamik zemin büyütmesi

Seismic waves from bedrock during their propagation are affected by the properties of the layer through which they passed; there may be changes in time, frequency and amplitude. Seismic waves is affected by local condition such as bedrock depth, thickness of soil layer, dynamic properties, lateral discontinuity of the soil and topographical properties. In this study, how to the effects of local condition on soil response analysis were investigated. One-dimensional (1D) nonlinear site response analyses were performed using DEEPSOIL software in an area located on the coast of the Izmir Bay where of deep alluvial soils govern the local geology. The soil profile is predominantly composed of thick clay layers and occasional sand-gravel layers in the study area. Nonlinear analyses were performed with the acceleration-time records that are taken from the PEER Ground Motion Database. In this study, two different bedrock levels are studied during dynamic site response analyses. The free field design spectra obtained by bedrock level depth of 240m with nonlinear methods were compared with those obtained by bedrock level depth of 1000m using effective and total stress based nonlinear methods. Also specific site response analyses results were compared code-based design. Results of the study showed that model depth and effective stress analysis affect site response analysis significantly and also obtained response spectra according to code-based was more conservative than according to the specific site response analysis. The other important result of the specific site response analysis is extension of the period.