STUDY ON EFFECT OF ORTHOGONAL WALL OF WOODEN FRAMED HOUSE, NAGAYA, MODELS CONSIDERING FLOOR STIFFNESS

We carry out earthquake response analyses of two Nagaya models with uni-axial eccentricity considering their floor stiffness subjected to bi-directional input earthquake motions, and examine the orthogonal wall effects. The orthogonal wall effect means how walls perpendicular to the eccentric direction will control the tortional vibration. The different two Nagaya models are one- and four-unit types. We choose the floor stiffness, the shape ratio of depth to width on the plan, the eccentric ratio, the wall quantity and its ratio, and the kind of input motions and their level in the analyses as parameters. The results obtained show that the factors of the orthogonal wall effects are mainly the floor stiffness and the shape ratio. The required wall ratio of depth to width is 2.0 for motions with Vmax=10cm/s, and the required yield shear coefficient of depth is 0.5 for motions with Vmax =50cm/s. The kind of motions and their level do not become the factors of the effect.