<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.imposing uniform displacements at the pile heads, isrepresented by plate bending finite elements. The second partis a group of piles embedded in the soil half space. Pile-soilinteraction is modeled by nonlinear load transfer curves andpile-soil-pile interaction is modeled using Mindlin’s equationfor point load within elastic half space.The factors affecting the load-settlement behaviour ofpile groups are presented and discussed herein. These factorsinclude, soil nonlinearity, soil nonhomogeneity, groupconfiguration, pile spacing, pile length and soil type. Thesefactors were found to greatly affect both the loaddistribution of different piles in the group and the groupsettlement.It could be concluded that, considering soil nonlinear-ityand nonhomogeneity generally rendered the pile groupstiffer behaviour than the case of linear homogeneousanalysis. The pile spacing seems to have great effect in theload-settlement behaviour of the pile group with less effectfor the pile length.