The Equivalent Period and Damping of Soil-Structure Systems on Layered Half-Space

Please enable javascript in your browser.

Esmaeilpour, Pouria | 2014

709 Viewed

Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45975 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Ghannad, Mohammad Ali
Abstract:
Since the early 1980s, it is well-known that the dynamic properties of structures are effected by flexibility of the underlying soil due to Soil-Structure Interaction (SSI). As a result, the soil-structure systems usually has a longer natural period and higher damping ratio that structure would have in the fixed-base state. The importance of SSI effect as well as the complexity of the phenomenon have made it the subject of several researches for the last four decades. It also has found its way into some seismic codes and provisions as simplified guidelines.In the present paper, a simplified 3DOF model is suggested as the soil-structure system by replacing the structure by a SDOF model using modal coordinates of the fixed-base structure. The modal parameters of the system are evaluated parametrically through the eigenvalue analysis. The model is applied for the case of building on surface of half-space soil medium and satisfactory results are achieved in comparison to code provisions. The model is also easily applicable for more complicated cases such as building on layered half-space soil media which can be more realistic case in most cases
Keywords:
Soil-Structure Interaction ; Damping ; Simplified Method ; Cone Models ; Layered Half Space ; Equivalent Period ; Homogeneous Half-Space

No TOC