<this thesis is concerned with the static elastic interactionanalysis of horizontally loaded coupled shear walls resting on a piled-foundation which consists of a capping beam joining two line groups ofpiles embedded in an elastic half plane soil medium.The traditional non-interaction approach of analysis deals withthe super-structure as a separate system having a certain type of virtualsupport at its interface with the foundation.The non-interaction approach is also used in this thesis byanalyzing the coupled shear wall as a separate structure of fixedsupports at the level of its interface with the capping beam, ascommonly assumed by most researchers and designers. The piledfoundation system is then analyzed using the reactions of the fixedsupports as applied forces on the capping beam which, in this case, isnot restricted at the points of load applications.The main objective of this thesis is to investigate the behaviourof the coupled shear wall - capping beam - piles - soil system for bothinteraction and non-interaction approaches of analyses.The thesis is divided into two main parts as follows:-A) Finite element study:Thirty-seven theoretical models are studied in a two-dimensionalplane stress state for both approaches of analyses in order to investigatethe following straining actions:1- Loads taken by the piles and their displacements at the soilsurface.2- Normal and shear stresses at the critical sections of thecapping beam.3- Normal stresses at the base level of the coupled shear wall.4- Distributions of the shear and axial forces in the couplingbeams.5- Maximum drift of the coupled shear wall.