Abstract
The current earthquake resistant design code for building in Japan, basically assumed a rigid horizontal diaphragm while calculating the eccentricity and correction coefficient of torsion. Such assumption may cause dangerous design while considering a flexible horizontal diaphragm with large eccentricity for real structure. Considering the shear deformation of floor, calculation method has been presented in this paper for eccentricity and correction coefficient of torsion. In elastic design, eccentric moment caused by earthquake force is generally resisted by the walls both X and Y directions, which in such case show rotation resist effect. Assuming the shear stiffness of the floor and the rotational resistant force from the wall to be in-series, formulae for calculating the eccentricity have been derived. These formulae also are verified by simulating an elastic one span model, using both static analyses and dynamic time history analyses.
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