I am designing a concrete headwall for drainage pipe and want to know how far below the riverbed should the footing be? Frost depth is 4'. I would normally think the footing should be at frost depth, but I've seen headwalls that seem to bear right at the surface. Isn't scour also a concern?
What year did allowable wood bending stress values change from Fb=1450psi in the Timber Constrction Manual to the much reduced values in the AFPA Deesign Guides?
If I am checking a structure built when the 1450psi was enforced, can I use that bending value today for checking heavier loads on the...
Is a railing is required on top of a marine bulkhead, or a retaining wall? I have seen some that do and some that don't have railings.
The building code doesn't seem to apply to marine environments or retaining walls.
I am designing a cantilever sheetpile wall with sloped fill on both sides. There is sloped backfill of 20 degrees up away from the wall and in front down away from the wall at 39 degrees. The wall is only "retaining" 7', but the front slope does not seem stable. How can I take this into account...
Does anyone have any ideas on how to reinforce a 12-sided tapered transmission pole for moment? Filling with concrete doesn't seem to help the moment capacity much.
What is the point of the second term for internal building pressure in the ASCE7 equation 6-17 for calculating applied wind loads???
Pz = q G Cp - q G Cpi
If I apply all positive (or all negative) pressure to the inside walls, the net result of adding the leeward and windward...
We are checking our model with the original loads that were provided from 1930, and 1/3 increase would help the members pass the code check. We are also analyzing for today's loads under IBC.
Does the allowable stress increase of 1/3 for wind loads apply to a steel structure built in 1930?? We only have a steel manual as far back as 1950, and the 1/3 increase is permitted then.
I found a document from the Nickel Development Institute which addresses this exact issue called "Stainless steel in swimming pool buildings". It can be downloaded from their website.
Is 316SS a suitable material to use in a heavily chlorinated, moist environment? We are finding that it rusts and fractures. What material would be best to use for structural supports?
Is there an allowable stress increase for concrete under temporary load? If so, where is this stated, what is the duration for temporary stress increase?
I remember using an allowable stress increase for existing steel, but I cannot find where it came from. It was in the order of 3% to 5%. AS long as your new loads did not increase the stress by that percentage it was OK to add the load. Does anyone know what I am referring to? Thanks.
thanks. seems like i have to anchor it anyway by code even though it works for overturning and sliding. There are no holes for attachment on the transformer and the electrical engineers say they never are attached- but the IBC states it pretty clearly.
