Soil structure interaction in tall buildings by a discrete force method





j The importance of base flexibility on the

elasto-plastic behaviour of spatial shear walls

subjected to any type of loading was examined.

An analysis of elasto-plastic spatial shear walls

was developed using a discrete force method,

which models the shear walls as a system of

interconnected discrete structural elements

and the base flexibility by effective rotational

and vertical elastic stiffnesses K,B and K,

respectively. As the magnitudes of these

stiffnesses depend on the properties of the

supporting soil and also on the characteristics

of the foundation itself, different soils were

considered. The analysis was based on the

force approach, using as redundants the shear

forces, not only at the contraflexural points of

the connecting beams, but also at wall

junctions. The elasto-plastic condition was

restricted to the connecting beams by using a

convenient bilinear model for the force

formulation. The objective was to provide a

theoretical treatment of the

foundation–structure interaction that is

suitable for implementation in the discrete

force method. In addition, the results

obtained in the discrete force modelling of the

soil interaction are presented, and the

applicability of the model to some

representative problems is discussed.


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