Comparative Study of Various Parameters for Pre-Engineered Building & Conventional Truss Building Taking Effect of Soil Structure Interaction

There are many circumstances in civil engineering for which interaction between structure and ground has to be considered prominently. Hence the behavior of soil strata under the structure plays an important role during the earth quake excitation forces and other lateral forces on the structure. The phenomena may be defined as "The process in which the response of soil influences the motion of structure and motion of structure influence the response of the soil is termed as SSI". In order to study structural behaviour of any structure, it is prominent to study the effects of soil structure interaction (SSI). In present study, attempt have been made to study the influence of soil structure interaction on Pre Engineered Building (P.E.B) and conventional truss shed building(C.S.B).Usually the structural behaviour is analysed assuming the fixed support conditions at the base of structure. In conventional method the foundation flexibility of soil mass is ignored which is likely to affect the structural response of building. The soil flexibility is integrated in the analysis of structure using Winkler's spring model approach. For analysis P.E.B and C.S.B with 15m, 21m, 24m, 30m spans are considered with equal bay spacing. Three different soil strata's i.e. hard, medium and soft are used for SSI study. The analysis is carried out in STAAD Pro.V8i software using response spectra of IS 1893-2002. The effect of SSI on various parameters like base shear, lateral displacement, etc. are studied and discussed. To get real behaviour of superstructure the subgrade must be modelled adequately well. The study reveals that the SSI significantly affects the performance of the structure.