Title: A new criterion for considering soil-structure interaction on analysis of moment frames

Authors: Elham Ghanbari; Ali Ghanbari

Addresses: Faculty of Engineering, Kharazmi University, No. 49 Mofatteh Ave., Tehran, Iran ' Faculty of Engineering, Kharazmi University, No. 49 Mofatteh Ave., Tehran, Iran

Abstract: There is no general criterion to determine the necessity of considering the soil-structure interaction in codes. In this study, the effects of considering soil on seismic response of structures are assessed by direct and equivalent spring-dashpot methods. The moment frame structures with three to ten stories located on different soil types are analysed. The results show that considering soil-structure interaction in some models causes an increase and a decrease up to 2 times and 0.6 times in storey shears, respectively. The maximum increase is related to ten-storey buildings which are located on soil type IV and the maximum decrease is related to three-storey buildings which are located on soil type II. Also, considering the soil-structure interaction increases the structure principal period. Finally, a new criterion for determining the necessity of considering soil-structure interaction is presented. In the criterion the soil type, shear wave velocity, natural frequency of structure and building height are considered.

Keywords: soil-structure interaction; spring-dashpot method; direct method; base shear; storey drift; concrete moment frames; structure period; seismic response; earthquakes; soil types; soils; shear wave velocity; natural frequency; building height.

DOI: 10.1504/IJSTRUCTE.2016.073677

International Journal of Structural Engineering, 2016 Vol.7 No.1, pp.31 - 47

Received: 05 Jan 2015
Accepted: 12 Jun 2015

Published online: 15 Dec 2015 *

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