Effects of Soft Soil and Hysteresis Model on Seismic Demands

摘要

The main objective of this research is to develop procedures that will permit anexplicit incorporation of the effects of deterioration of structural properties and site surface geology on the seismic demands imposed on structures by strong ground motions. This implies consideration of the influence of stiffness degradation and strength deterioration, including P-delta effects, and of the effects of site soil conditions on those demand parameters that can be used directly for design of structures. Thus, the research combines ground motion and structure response issues, with an emphasis on parameters that incorporate both relevant ground motion as well as structural response characteristics. The first part of this study focuses on the effects of negative strain hardening (P-delta) and strength deterioration on the demand imposed by ground motions on the strength of inelastic SDOF systems. Strength demand is defined here as the strength that needs to be provided in order to limit the ductility of the SDOF system to predefined target value.