Wood armer method

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Method for design of reinforcement for concrete shells.

Wood Armer is useful because it allows moment triads from grillages (Mx, My, Mxy) to be transformed into simple bending moments in two directions for reinforcement design. This is important because the twisting moment Mxy can be significant. [1]

An alternative to Wood Armer is the method of Denton and Burgoyne, see 'The assessment of reinforced concrete slabs', SR Denton and CJ Burgoyne, 'The Structural Engineer', Volume 74, Number 9, May 1996. This is useful where the reinforcement is already known e.g. in a existing bridge slab. [2]


  • Hillerborg, A.: A plastic theory for the design of reinforced concrete slabs. IABSE Sixth Congresss. Stockholm Preliminary publication. pp 177-186
  • Wood, R.H.: The reinforcement of slabs in accordance with a predetermined field of moments. Concrete. Vol. 2, No. 2. February 1968. pp 69-76
  • Wood, R.H. and Amer, G.S.T: The theory of the strip method for design of slabs. Proceedings of the Institution of Civil Engineers. Vol. 41, No. 10 October 1968. pp 285-311.

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