Soil–structure interaction in tall buildings by a discrete force method

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Soil–structure interaction in tall buildings by a discrete force method

Author: A. Nadjai, BEng, MSc, PhD, MIStructE, MIABSE, PGCUT, D. Johnson, BEng, MSc, PhD, MICE, FIStructE, and J. F. Lyness, BSc, MSc, PhD, MICE, FIStructE, AFIMA | Size: 0.22 MB | Format: PDF | Quality: Unspecified

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 Kb and Kv, 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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