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From:
http://www-mdp.eng.cam.ac.uk/web/library/enginfo/textbooks_dvd_only/DAN/buckling/intro/intro.html
The creator of the course on buckling writes:
"This photograph illustrates local buckling of a model box girder constructed from thin plates, not unlike the road deck of the Humber bridge above.
"Inclined striations are caused by shear loading in the web of a beam or in a torqued tube giving rise to compressive buckling stresses at 45o to the longitudinal direction as predicted by Mohr's circle."
Also see:
Kuhn, P., "Investigations on the incompletely developed plane diagonal tension field," NACA Report 697, 1940.
Kuhn, P.: Stresses in aircraft shell structures, McGraw-Hill, New York, Toronto, London 1956
Page 147 / 256