Soil - Structure Interaction of Multistory R.C.C. Frames

CIVIL ENGINEERING

Comprehensive experimental and analytical studies have been carried out to understand the behavior of existing frame buildings constructed before the introduction of seismic design codes in 1970’s.Different aspects of the response have been investigated and inherent weaknesses have been pointedout.This usually has been done assuming a fixed-base structure while ignoring the flexibility of soil andfoundation.In this thesis, the interaction between the super-structure and sub-structure (SSI) is investigated by modelling the soil as simple as possible to capture the overall response of the system.As new analytical hysteresis rules and more advanced tools of analysis have been developed in recentyears, the linear response of a structure which can be representative of a broad range of existing or newly designed structures, is investigated while allowingfor flexibility of the soil-foundation system and SSI effects. The use of flexible base in the analysis can lead toreduction in the structural response and damage consequences in joints and infills. The results of this study suggest that the compliance of simply modelled soilfor typical building structures have in average beneficial effects in terms of structural demand especially for stiff structures.

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