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MASN - Allowable Shear[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: MASN - Allowable Shear
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 04 Oct 1997 22:50:51 GMT
I am studying to take the NCEES structures test this Fall and came across something I would like to get other opinions. I have a copy of NCEES study guide which gives sample questions. A masonry question call for the design of a lintel. It is based on the UBC code. I don't usually use this code for masonry design. I prefer the ACI code. The problem is based on UNINSPECTED values. 1994 UBC 2107.1.2 states "when quality assurance provisions do not include requirements for special inspection as prescribed in section 1701, the allowable stresses for masonry in section 2107 shall be reduced by one half". Now, I interpret this to mean I calculate the allowable stresses for bending, compression, shear, etc. and then divide it by 2 to find the maximum allowable stresses. My question comes from the answer to the sample problem for shear. The code equation is: Fv=1.0*SQR(f'm) (7-17) The solution for the sample question was as follows: Fv=1.0*SQR(f'm/2) My interpretation of the code is: Fv=[1.0*SQR(f'm)]/2 Which is right? Also, I thought for masonry design the critical section for shear was at a distance of 'd' from the face of support, like concrete, but I can't find this in the UBC. Did I miss it, or am I wrong? While I'm at it, allowable shear and tension values for bolts, should they be halved for uninspected construction? The code as stated above specifically states "allowable stresses for masonry" are to be halved. What about hardware? __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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