CONTRIBUTION OF SOIL-STRUCTURE INTERACTION TO SEISMIC RESPONSE OF BUILDINGS | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 3, Volume 39, No 4, July and August 2011, Page 715-750 PDF (1.7 MB) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2011.127696 | ||||
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| Authors | ||||
| Hamdy H. A. Abd el-Rahim1; Ahmed Abd El-Raheem Farghaly2 | ||||
| 1Associate Professor, civil engineering department, Faculty of Engineering, Assiut University | ||||
| 2Lecturer, Faculty of Industrial Education, Sohag University | ||||
| Abstract | ||||
| Buildings are susceptible to soil structure interaction effects due to the induced changes in the dynamic characteristics of soil during seismic excitation; particularly several buildings have been constructed on soft soil. Because of this detrimental effect, this paper aims at clarifying the soil structure interaction effect on the seismic response of buildings under strong ground motions to provide damage control and enhance the safety level of such buildings. An iterative dynamic analysis was performed using SAP2000 program to carry out three dimensional time history analysis of non-linear soil-foundation-building models under a great earthquake ground motions. The interaction between the soil and structure is represented by Winkler spring model and the damping effect of the soil is modeled by dashpots. The coefficients of springs and dashpots were based on medium soil profile underneath and along the embedded depth of foundation and calculated as recommended by Newmark and Rosenblueth 1971 [23]. A comparison of response for different building models subjected to three dimensional great earthquake ground motion shows that incorporating the soil structure interaction could have a detrimental effect on the building performance and overestimates the top < br />displacements response. On the contrary flexible bases of buildings have noticeable effect on the structural behavior of buildings by providing pronounced reduction in the internal forces of superstructure response compared to the fixed base buildings. Also, the obtained results confirmed that the dynamic characteristics of soil structure system should be recommended for conservative nonlinear seismic response of the high building since it mitigates of earthquake hazards. | ||||
| Keywords | ||||
| Buildings; Soil-Structure Interaction; Flexible bases; Fixed base; Three dimensional Ground motions; Seismic Response; Time history analysis | ||||
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