Parametric Study on the Behavior of Raft Foundation for an Irregular High-Rise Building

Raft-foundation is obligatory where soils have low bearing-capacity and when they have to support substantial structural loads. Usually structures on marshy-land, soft-clay and land that are made-up of sanitary land-fill or other materials necessitate raft-foundation. Raft-foundations are usually favored in the soil that are assumed to undergo subsidence. Raft-foundation is the economical solution where deep-foundation like pile-foundation are not economical and reasonable and isolated-column footing is unpractical due to large footing size or over lapping of neighbor footing. In this project a 20 storeyed building is selected which is irregular in shape. The superstructure is modelled and analysed using ETABS software. The type of the foundation is selected for this study is Raft foundation and it’s modelled and analysed using SAFE software. In the parametric study, thickness of the raft is varied (1250 mm and 1750 mm) and its effect on maximum settlement, maximum bending moment and maximum shear force and soil pressure is observed.