Beam Theory
Beam Theory
(OP)
At what span to depth ratio does beam theory go out the window in plate girder design?
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RE: Beam Theory
For pratical purposes you can probably have spans half that limit without experiences large differences from beam theory.
RE: Beam Theory
RE: Beam Theory
RE: Beam Theory
I'm not sure how that applies to plate girder design.
EIT
RE: Beam Theory
Does STAAD consider shear deflections/deformations in a girder analysis?
RE: Beam Theory
I tested a couple of different types of loading (single point load vs. distributed load) on both a simply supported beam and a fixed - fixed beam. I ran RISA models with shear deformation turned on and with shear deformation turned off.
I got a difference in deflection of about 30% based on shear deformation when I used a similar span to depth ratio. However, the moments and shear values were much closer (within about 7% of each other).
That should give you some idea about how accurate (or inaccurate) traditional beam theory would be.
RE: Beam Theory
http://www.eng-tips.com/viewthread.cfm?qid=297434
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Beam Theory
I think Roark gives some equations based to account for the shear deflection and also a stress increase multiplier.
EIT
RE: Beam Theory
RE: Beam Theory
http://sdj.sagepub.com/content/26/1/15.full.pdf
desertfox
RE: Beam Theory
EIT