Along and Across Wind Responses of Tall Buildings Considering Soil Structure Interaction
Aiswaria G. R1, Jisha S. V2
1Aiswaria G. R. PG Student, Department of Structural Engineering, Mar Baselios College of Engineering and Technology, (Kerala), India.
2Dr. Jisha S. V. Assistant Professor, Department of Civil Engineering, Mar Baselios College of Engineering and Technology, (Kerala), India.
Manuscript received on 05 December 2018 | Revised Manuscript received on 19 December 2018 | Manuscript published on 30 December 2018 | PP: 38-43 | Volume-8 Issue-2C, December 2018 | Retrieval Number: 100.1/ijeat.ICID-2018_EE_106
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Abstract: Fora good wind resistant design, the exact behaviour of a building needs to be assessed. Thus it is important to consider the effect of the foundation and the underlying soil stratum flexibility along with the building during analysis which is investigated in this paper. A 180m high tall RCC building with piled raft foundation founded on different soil conditions is being considered here. The building is assumed to be located in terrain category IV and interference zone IVas per theIS: 875 (Part 3): 2015 subjected to an average wind speed of 50 m/s. Linear analysis performed on the building with rigid base is compared with the integrated building-foundation-soil system considering material non-linearity of the soil. Drucker Prager model is used to represent the material non linearity of the soil stratum to consider soil structure interaction (SSI). Using numerical finite element analysis, the 3D structure is analysed for wind induced responses such as maximum lateral deflection and base moment with and without considering soil flexibility. On considering SSI, free vibration analysis, showed that the frequency decreases with increase in flexibility. It was also observed that, on considering SSI, displacement got increased by 18% and base moment got reduced by 85% of the structure without SSI effect for the building considered.
Keywords: Acorss Wind Force, Along Wind Force, Finite Element Analysis, Soil Structure Interaction.
Scope of the Article: Soil-Structure Interaction