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About Wood Armer Method of incorporating Twisting Moments

About Wood Armer Method of incorporating Twisting Moments

About Wood Armer Method of incorporating Twisting Moments

(OP)
I know that Wood-Armer method is the best-used method for handling Twisting Moments in slab. I have gone through the derivation of this method in journals and we are stuck with respect to the following points in using this method for our professional practice -

1) The method is based on yield criterion . So can we use wood - armer to combine Mx , My and Mxy at service conditions when we know nothing in yielding? Say crack control design. Here steel is much below yield. The SLS load combinations also have Mxy obviously. But steel is not yielding and method of design is via a spreadsheet where you input a moment to get a crackwidth which is typically controlled to 0.1-0.2.

2) The methodology does not take into account axial forces(this i say as i looked into its derivation). What do we do then when we also have axial forces on the plate element.

RE: About Wood Armer Method of incorporating Twisting Moments

most-used possibly???
recommend you review this method, it maybe better for your situation.
http://www-civ.eng.cam.ac.uk/cjb/papers/p33.pdf

http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."

RE: About Wood Armer Method of incorporating Twisting Moments

See a British paper "Determination by computer of reinforcement in box-girder bridges", by R.Douglas and S.Port, published in the Civil Engineering and Public Works Review of November 1971, which gives a simple way to incorporate axial (membrane) forces into the Wood-Armer equations.  There may well be more recent papers repeating or extending the same approach.

For a very readable paper on design treatment of Mxy (but with no discussion on incorporating "axial forces") see "Reinforced Plate Design - Design for Mxy Twisting Moment", by John Li, dated 9 April 2002.  I believe this paper was published by Solution Research Centre, of Hong Kong.  I found it on the web a few years ago, but a quick search a few minutes ago gave lean pickings.

There is also a very informative discussion paper "Moments in concrete design" by Gil Brock (a frequent contributor to these fora), published in Concrete in Australia, Vol 36, No 2.

RE: About Wood Armer Method of incorporating Twisting Moments

(OP)
@rowingengineer

Had gone through the denton and burgoyne paper before. I don't see how it specifically addresses my concerns.

@ Denial,

Your pointed publications look informative but tried as i might, couldn't even get one off the net! Any help appreciated.

RE: About Wood Armer Method of incorporating Twisting Moments

Nimish07, I will scan them and e-mail them to you.  E-mail me your e-mail address, to my address as obtained from my web site (rmniall.com).

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