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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 Perry Robertson formula ： ウィキペディア英語版 Perry Robertson formula The Perry-Robertson formula is a mathematical formula which is able to produce a good approximation of buckling loads in long slender beams, and is the basis for the buckling formulation adopted in EN 1993. The formula in question can be expressed in the following form: $\backslash sigma\_m\; =\; \backslash frac\; \backslash left(f\_y\; +\backslash sigma\_e\backslash left(1+\backslash theta\backslash right)\; -\; \backslash sqrt\; \backslash right)$ with $\backslash theta\; =\; \backslash frac$ where: * $\backslash sigma\_m$ is the average longitudinal stress in the beam's cross section * $f\_y$ is the material's elastic limit * $\backslash sigma\_e$ is the average tension measured in the cross section which correspond to the beam's Euler load * $w\_$ the amplitude of the initial geometrical imperfection * $c$ distance from the cross section's centroid to the section's most stressed fiber * $i$ the section's radius of gyration Robertson then proposed that $\backslash theta\; =\; 0.003\backslash lambda$, where $\backslash lambda$ represents the beam's slenderness. ==See also== * Buckling * EN 1993 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「Perry Robertson formula」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.