The torsion effect on buildings subjected to seismic load

Abstract eng:
Complex forms are often used for the design of buildings. This is induces the torsion phenomenon which could be disastrous in case of seismic event. To reduce it effects, the torsion must be taken into account through ever regulation or modelling. This paper, deal with the last one. A simplified method including the torsion effect is used. This method is based on the theory of Lie’s groups. This model consider the six degrees of freedom of a structure, then the deformations, the internal efforts, the dynamic eccentricity and the mass participation factors are determined. The results obtained, on a building of the research centre ISPRA in France and a building with three colons, are satisfactory.

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