SIMPLIFIED METHOD FOR EVALUATION OF SOIL-STRUCTURE INTERACTION EFFECTS IN LIQUEFIABLE SOILS

The liquefaction phenomenon is one of the conditions which cause the nonlinear behavior of soils (e.g., Kramer, 1996).There are many samples of structural damages in the world in which the main reason for instability was pore-pressure buildup during an earthquake. However, the effect of pore-pressure buildup has usually not been considered in the substructure method. In this paper, the horizontal, vertical, and the rotation deformation of structures were elaborated in the substructure method for liquefaction conditions. The soil nonlinear behavior in liquefaction phenomenon was estimated using equivalent linear method based on (Khodakarami and Lashgari, 2018). It was used to predict pore-pressure buildup and stiffness of soil during earthquake. For this purpose, a computer code was developed to resolve the governing equations (NIST, 2012)of the MDOF system by the Newmark-β method. The deformations degrees of freedom were shown in Figure 1. As shown in this figure, the horizontal springs were connected in series form. The verification of the results by a centrifuge study (Mehrzad et al., 2016) indicates that this developed code can provide reasonable results and this method is valid when the soil is completely liquefied.

کلیدواژه ها:

Equivalent method ، Liquefaction ، Soil-structure interaction ، Earthquake ، Substructure method