Structure and Foundation Interaction Theory

Two methods are described in which the response of plane, framed structures to load can be assessed by accounting for superstructure and substructure as a single compatible unit. Both methods are based on the assumption of linear-elastic behavior in superstructure and raft. The Winkler model is used to represent the behavior of the soil beneath the raft. The first method uses equilibrium equations to describe separately the response of structure and raft. Sufficient relationships to solve the complete problem are obtained by adding the compatibility relationships at the junction of raft and superstructure. In the second method, statically admissible contact pressure distributions beneath the raft are successively modified to converge upon the situation where the deformations at the junction of raft and structure are compatible. Both methods are designed for hand calculations.