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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Arching or Compressive Membrane Action in Reinforced Concrete Slabs ： ウィキペディア英語版 Arching or Compressive Membrane Action in Reinforced Concrete Slabs Arching or compressive membrane action (CMA) in reinforced concrete slabs occurs as a result of the great difference between the tensile and compressive strength of concrete. Cracking of the concrete causes a migration of the neutral axis which is accompanied by in-plane expansion of the slab at its boundaries. If this natural tendency to expand is restrained, the development of arching action enhances the strength of the slab. The term arching action is normally used to describe the arching phenomenon in one-way spanning slabs and compressive membrane action is normally used to describe the arching phenomenon in two-way spanning slabs. == Background == The strength enhancing effects of arching action in reinforced concrete floors were first recognised near the beginning of this century.〔Westergaard, H.M. and Slater, W.A., ' Moments and stresses in slabs', Proceedings of the American Concrete Institute, 1921, Vol. 17, pp 415 - 538.〕 However, it was not until the full scale destructive load tests by Ockleston〔Ockleston, A.J., 'Load tests on a three storey building in Johannesburg', The Structural Engineer, 1955, Vol. 33, October, pp 304 – 322.〕〔Ockleston, A.J., ‘Arching action in reinforced concrete slabs’, The Structural Engineer, 1958, Vol. 36, No.6, pp 197 – 201.〕 on the Old Dental Hospital in Johannesburg that the extent of strength enhancement caused by arching action was really appreciated. In these tests, collapse loads of between 3 and 4 times those predicted by yield-line theory〔Johansen, K.W., ‘Brudlinieteorier’, Jul. Gjellerups Forlag, Copenhagen, 1943, 191pp (Yieldline theory’, translated by Cement & Concrete Association, London, 1962).〕 were obtained. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Arching or Compressive Membrane Action in Reinforced Concrete Slabs」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.