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RE: Question-Shar Failure of Shallow Foundation

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Title: Samsung Enterprise Portal mySingle



I am guessing, that it has something to do with a 45 degree failure plane. Whilst the punching shear, may have more of a bearing area distribution, which tends to have a 1:2 distribution. The punch through should occur close to the face of the punch. The further away from the punch the more bending and tearing occurs, and the less have pure shear.


But just guessing, since don’ know much about concrete. But know a little about designing punches for deep drawing and blanking. Which in terms of steel the punch tends to penetrate about 2/3rd’s of depth, then the crack propagates the last 1/3rd and a 45 degree fracture plane results. So maybe for resisting punch through design is based on half depth, and 45 degree failure plane.



Conrad Harrison

B.Tech (mfg & mech), MIIE, gradTIEAust



South Australia


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