Abstract
We carry out earthquake response analyses of two Nagaya models with uni-axial eccentricity considering the floor stiffness and examine the orthogonal wall effects. The effect means how walls perpendicular to the eccentric direction will control the torsional vibration. The two different Nagaya models are one- and four-unit types. We choose the floor stiffness, shape ratio of the length to the width on the plan, eccentric ratio, wall quantity and the wall ratio, and kinds of input motions and their maximum value in the analyses as parameters. The results obtained show that the factors of the orthogonal wall effect are mainly the floor stiffness and shape ratio, and that the demand ratios are 2.0 and 1.5 for the two models. The kinds of input motions and their maximum values do not become to the factors of the effect.
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