Parametric Study on the Performance of Raft Foundation with Interaction of Frame

摘要

In most of the design offices, analysis of the raft is carried out without considering the effect of the stiffness of the frame. The analysis of the superstructure without modelling the foundation properly and conversely analysing the foundation system without considering the rigidity of the superstructure may mislead the estimation of the forces, the bending moments, the settlements etc. This paper examines the identification of the parameters which affect the interaction and the parameters are grouped into relative stiffness factors krs and ksb. An interaction analysis is performed for the five storeyed space frame of 3 bays ? 5 bays, using ANSYS finite element code. The soil was treated as an isotropic, homogenous and elastic half space medium and the following conclusions are drawn from this analysis. The differential settlements reduced due to interaction and the performance of the raft depends on ksb values. The raft moments in the end span is increased with the increase in ksb value. The moments Mx and My in the corner column at all the storey levels are higher in the case of the interaction analysis than in the conventional analysis.