周辺固定の梁なし階段の応力について

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  • 6) A STUDY ON THE STRESS DISTRIBUTION IN THE ALL-EDGE FIXED STAIR SLABS WITHOUT BEAMS
  • シュウヘン コテイ ノ リョウ ナシ カイダン ノ オウリョク ニ ツイテ

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In case of stair slabs with subbeams and bridgeboards, landings and flights are usually designed as rectangular plates with all edge fixed. And in case of having only subbeams, they are designed as rectangular plates with three edges fixed and one free. It is noted that stairs are often designed without both subbeams and bridgeboards. Conventional solutions are brought about by the difficulty in analyzing the actions of these slab memders. The modes of stress distributions in stair slab with subbems and bridgeboards may be same as those in slabs with a slit and with a rectangular hole. In both cases flights should be treated as having two different rigidities in longitudinal and transversal directions. Approaches from this viewpoint seem not to have been made except by Dr. Yokoo who presented a solution by the method of difference for such a type of anisotropic flights with three edges fixed and one free and a type composed of anisotropic flights and isotropic landings with the inflexible beam between and witn three edges fixed and one free in all. The present paper presents solutions for a few cases of stair slair slab having only bridgeboards. The solution are obtained from simultane ous systems of difference equations concerning isotrpic (landing) parts and anisotropic (flights) parts and including the equations at the points in question relative to both these parts. The results of the experiment help those equations to be set up on the assumption that a stair slab be approximately treated as a holizontal plane body which is simply supported at the end of its slit instead of as a system of holizontal and sloping members.

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