الفهرس | Only 14 pages are availabe for public view |
Abstract This thesis studies the effect of soil (site conditions) on the dynamic behavior of structures. Full interaction between bedrock motion, subsurface soil, substructure and superstructure are represented as a dynamic soilstructure interaction problem using the fmite element method. Nonlinear behavior of soil stiffness and damping ratios as a function of shear strain amplitude, confining pressure and plasticity index are taken into account. An advanced technique for earthquake simulation analysis is presented. Improvements have been made to raise its accuracy. Different simulated earthquakes for bedrock motion have been used to predict the effects of various site conditions on the dynamic characteristics of surface ground motion. Extensive studies have been carried out, including wide range of soil and site condition, to develop enhanced design response spectra curves. These enhanced design curves have been normalized to be used for structural design purposes. Comparison between these enhanced curves and recent international building codes is illustrated. Moreover, the effects of site conditions, foundation types, location of tie beams and their inertias on the dynamic response of an example framed structure have been examined. |