SOIL-STRUCTURE-INTERACTION IN FRAME STRUCTURES

Abstract

Framed structures are commonly used in the construction of buildings and industrial structures. The conventional practice considers the isolated behaviour of structure during its analysis and design. In reality, however, supporting soil foundation system alters the behavior of superstructure and hence need for considering the mutual interaction. The phenomenon of soil-structure interaction is more pronounced in multistoreyed building frames especially, when resting on poor soil, due to possibility of large unequal column loads. The term soil-structure interaction is used for the mechanics of interaction between foundation, soil and superstructure. The phenomenon in which the flexibility of foundation and the compressibility of soil mass alters the superstructure behavior which in turn alters the foundation deformation pattern, is termed as soil-structure interaction. In present thesis work a simplified analysis of a framed structure founded on three different types of soil namely loose, medium-dense and dense sandy soil is done by considering typical plane frames in both the direction. The results of 2-D analysis from both the directions are thus combined to ensure full load coming onto the columns are correctly estimated. The frame is idealized as an assemblage of column and beam elements resting on spring supports. The analysis yields stress resultants of the superstructure and substructure for design purpose.