PILED- RAFT FOUNDATION FOR HIGH RISE INDUSTRIAL STRUCTURE

Abstract

The design of high rise building for industrial structure with piled raft foundation on clayey soil in UPSIDC industrial area, sandila city, hardoi district. The higher load transfer buildings which are lies on loose soil. They cannot design with shallow foundation. It is necessary to provide deep foundation .in present area combination of shallow and deep (piled-raft) foundation is used. Piled raft foundation is adopted to reduce the total and differential settlement of foundation. In the present study, analysis of piled raft foundation is done by “plate on spring” approach in which the raft is represented by an elastic plate while the soil and piles are modelled as bed of equivalent spring at nodal points and intersecting spring respectively. The stiffness of pile is estimated by procedure given by Hazarika and Ramaswamy(2000). For the estimation of soil stiffness a method by de-beer and martens (1975) is employed for sand. For clays the same is estimated using immediate and e-log p curve. Software for the analysis of raft using finite difference method, estimation of stiffness for soil and pile and structural design of raft and pile is developed in SAFE software. Using this software a typical case study is analysed and results are presented. Effect of coefficient of subgrade reaction of soil and pile stiffness on the settlement, bending moment, shear force and punching shear values of raft are studied.