Abstract
The paper presents a novel modelling of superstructure-raft-soil mass system. The superstructure members have been represented by means of three-noded isoparametric beam elements with six degrees of freedom per node which take into account the effect of transverse shear and axial-flexural interaction. The plate bending element with five degrees of freedom per node has been employed to represent the raft and structural slabs. The soil mass is idealized by three-dimensional isoparametric finite and infinite elements. A detailed formulation of beam and plate elements is also included. The applicability of this model is demonstrated by analysing a four-storey, five by three-bay space frame supported on raft-soil mass system and by comparing the results with those obtained elsewhere. Further, an attempt is also made to investigate the effect of structural slab stiffness in the interactive analysis of the three component system. The results obtained with and without the slab effect have been compared with those obtained from conventional analysis.
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