153 Journal of Innovation in Engineering Education, VOL: 2, Issue : 1, March, 2019 SOIL-PILE-STRUCTURE INTERACTION EFFECTS ON HIGH-RISE BUILDING UNDER SEISMIC SHAKING Umesh Jung Thapa 1 *, Ramesh Karki 2 ABSTRACT In this paper, study of the response (base shear, time period, storey drift, storey displacement) of a structure is done for the tall building including basement with fxed base and with pile foundation considering Soil Structure Interaction (SSI). Finite element based program ETABS2016 v16.1.0 is used for the analysis of the superstructure. Seismic analysis is done to get the dynamic response of superstructure for two types of model,one model is with fxed baseand second is Model with Winkler spring for Chhaya Center, Thamel, a high rise building with 14 story including double basements. Itisobserved with the consideration of Soil Structure Interaction (SSI). The soil is replaced by spring and assigned at joints. El Centro earthquake (1940) is used for time history analysis. The response obtained due to SSI efect is compared with fxed based model. Results of analysis presented include the comparison of natural periods, base shears, displacements and overturning moment. It is observed that the natural periods increase and the base shears decrease as the base become more fexible. 1. INTRODUCTION Structures founded on rock are considered to be fxed base structure. Computation of their response is relatively simple. On the other hand, the same structure would respond diferently if supported on soft deposit. First, the inability of the foundation to confrm to the deformations of the free feld motion. Second, the dynamic response of the structure itself would induce deformation of the supporting soil. This process, in which the response of the soil infuences the motion of the structure and the response of the structure infuence the motion of the soil, is referred to as soil structure interaction. 1.1 Types of Analysis 1.1.1 Direct Analysis Direct Analysis method is the one in which the soil and substructure are modeled together in a single step accounting for both inertial and kinematic interaction. Inertial interaction develops in structure due to own vibrations give rise to base shear and base moment, which in turn cause displacements of the foundation relative to free feld. Kinematic interaction develops due to presence of stif foundation elements on or in soil cause foundation motion to deviate from free feld motions. 1.2.2 Substructure Approach Sub-Structure Method is one in which the analysis is broken down into several steps that *1 Postgraduate student, IoE, Email:umeshjthapa@gmail.com *2 Assistant professor, Thapathali Campus, Email:rameshkarki@ioe.edu.np