Soil-Structure Interaction Effects on Seismic Response of multi-story Buildings on Raft Foundation | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 1, Volume 42, No 4, July and August 2014, Page 905-930 PDF (1.16 MB) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2014.111441 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Shehata E Abdel Raheem 1; Mohamed M. Ahmed2; Tarek M.A. Alazrak  2
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| 1Civil Engineering Dept, Faculty of Engineering, Assiut University, Assiut 71516 | ||||
| 2Civil Eng. Department, Faculty of Engineering, Assiut Univ., Egypt | ||||
| Abstract | ||||
| The investigation on the energy transfer mechanism from soils to buildings during earthquakes is critical for the design of earthquake resistant structures and for upgrading existing structures. Thus the need for research into Soil-Structure Interaction (SSI) problems is greater than ever. Moreover, recent studies show that the effects of SSI may be detrimental to the seismic response of structure and neglecting SSI in analysis may lead to un-conservative design. Despite this, the conventional design procedure usually involves assumption of fixity at the base of foundation neglecting the flexibility of the foundation, the compressibility of soil mass and consequently the effect of foundation settlement on further redistribution of bending moment and shear force demands. Hence the soil-structure interaction analysis of multi-story buildings is the main focus of this study; the effects of SSI are analyzed for typical multi-story building resting on raft foundation. Three methods of analysis are used for seismic demands evaluation of the target moment resistant frame buildings: equivalent static load (ESL); response spectrum (RS) methods and nonlinear time history (TH) analysis with suit of nine time history records. Three-dimensional FEM model is constructed to analyze the effects of different soil conditions and number of stories on the vibration characteristics and seismic response demands of building structures. Numerical results obtained using soil structure interaction model conditions are compared to those corresponding to fixed-base support conditions. The peak responses of story shear, story moment, story displacement, story drift, moments at beam ends, as well as force of inner columns are analyzed. The analysis results of different approaches are used to evaluate the advantages, limitations, and ease of application of each approach for seismic analysis. | ||||
| Keywords | ||||
| Soil-structure interaction; Seismic design; Egyptian building code; Time history; Dynamic analysis; Moment resistant multi-story building; Raft foundation | ||||
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