Abstract
In this poper, which is the continuation of the studies written by the author in Transactions of the Architectural Institute of Japan (No. 59, No. 60, No. 63), the author deals with theoretically the effects of the longitudinal walls on the restraints of the deformation and rotation of slabs when the lateral forces act upon the symmetrical and unsymmetrical one-storied structures, which are provided with the transverse walls at the both ends and the longitudinal walls. The conclusions obtained from this analysis are the followings: (1) The longitudinal walls have effect on the restraints of the deformation and rotation of slab. The effect is not so large, however, that the lateral force distribution method based on the conventional principle, that is, the principle that slabs are perfectly rigid and the torsion of buildings is considered, can not be accepted generally in structural design when the shape of the slab between the transverse walls is slender in the longitudinal direction. So the limitations which can be accepted abobe mentioned lateral force distribution method are presumed as the followings. n≦(3〜4) spans: the number of the span between the transverse walls (2) The shearing forces and torsional moments carried by the longitudinal walls are both so small that they can be neglected in structural design. (3) The shearing force distribution among the columns of rigid frames of the longitudinal direction and the torsional moment distribution among the columns and transeverse walls are decreased by the effects of the longitudinal walls, and they can be neglected in structural design. where transverse direction: direction of the action of lateral forces longitudinal direction: direction perpendicular to the transverse direction transverse walls: walls of the transverse direction longitudinal walls: walls of the longitudinal direction
