Abstract: The response of a structure during an earthquake depends not only on the structure itself but also on the characteristics of the ground motion and the subsoil conditions. The actual behavior of the structure under seismic load may significantly differ from what the analysis provides considering the structure to be fixed at base. Particularly for soft soils, the foundation input motion during the earthquake differs from the free-field ground motion that may exist in the absence of the structure. These interaction effects lead to dynamic responses that may differ considerably in amplitude and frequency content from that obtained, when a fixed support is assumed. The present study focuses on the quantification of the effect of soil flexibility on the most important design variables in the seismic response of chimney structures with raft footing. For the analysis RC Chimney models are considered and the soil beneath the structure is modelled using both linear elastic soil models to represent the behavior of the soil. The soil structure interface is modelled with tied surface to surface contact. The time history analysis of the soil-structure model was carried out using the general FEM software SAP 2000 for ground motions BHUJ. Based on the analysis results, it has been concluded that the effect of soil-structure interaction plays a significant role to decrease the natural frequency, raft displacement, radial and tangential moments in annular raft.
Keywords: Dynamic soil-structure interaction; seismic response; finite element method; SAP 2000; natural frequency
Title: Soil Structure Interaction effect on 200m tall industrial chimney under seismic load
Author: Ganesh Kumar T., Shruthi H.K
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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