Influence of the soil-structure interaction on the fundamental period of buildings

Louay Khalil (1) , Marwan Sadek (1) , Isam Shahrour (1)

1 LML - Laboratoire de Mécanique de Lille - FRE 3723

This paper includes an investigation of the influence of the soil-structure interaction (SSI) on the fundamental period of buildings. The behaviour of both the soil and the structure is assumed to be elastic. The soil-foundation system is modelled using translational and rotational discrete springs. Analysis is first conducted for one-storey buildings. It shows that the influence of the SSI on the fundamental frequency of building depends on the soil-structure relative rigidity Kss. Analysis is then extended for multi-storey buildings. It allows the generalization of the soil-structure relative rigidity Ks to such complex structures. Charts are proposed for taking into account the influence of the SSI in the calculation of the fundamental frequency of a wide range of buildings.

Mots clés: building • charts • fundamental period • relative rigidity • soil-structure interaction • seismic

Louay Khalil, Marwan Sadek, Isam Shahrour. Influence of the soil-structure interaction on the fundamental period of buildings. Earthquake Engineering and Structural Dynamics, 2007, 36 (15), pp.2445-2453. ⟨10.1002/eqe.738⟩. ⟨hal-00188828⟩