Recent content by 10k

Thanks, TXStructural for the response. Yes, my question concerns bars in tension, and I apologize for mixing up ACI318-99 & 11. Paragraph 12.5.3.3 in 318-99 corresponds to paragraph 12.5.3 (b) in 318-11. Since the changes to paragraph 12.5 appear to be minor (for plain bars in normal wt...

thread167-228427 The above thread answers some of the questions I have about developing hooked bars in footings, but how do I use ACI 318-11, para 12.5.3.3 when the hooks are in a footing? PCA Notes on ACI 318-99 is a good example of my question. On page 24-18, the tension development length...

Lion06 -- Nothing is failure-proof. The ductility requirement is imposed to cover unexpected or unforseen overstress situations. Basically what it tells me is that we need to consider the ramifications of the mode of failure. Ductile-type failures have a degree of forgiveness that...

Lion06 -- You seem to be saying that ductile failure isn't a desireable failure mode. What am I missing here?

You should be very careful with substitutions for anchor rod material. The design engineer may have (should have?) selected the material and size to provide for the recommended ductile failure of the bolt before the concrete. F1554 material has ductility requirements that even bolts made from...

Chapter 3 of the Forest Products Society, "Wood Decks, Materials, Construction, and Finishing" has a lot of good advice for deck design. It specifically rejects the use of 2x2's for ledgers. Design according to Chapter 3 of this document is required by Section R502.2.1 of the...

I was a USMC helicopter pilot in my previous life, and would like to reinforce Ishvaaag's comments. Regardless of what James Bond can do, we never engaged the rotors (or even started the engine) of a helicopter inside a hanger or building. Visualizing such a scenario is enough to give me...

Check out articles on blast resistance in Modern Steel Construction in October and November of 2003. There's no simple answer.

Recently had a question regarding a ledger for a deck, and followed your thread hoping for answers. With one or two exceptions, the responses were not comforting. The most confidence inspiring comments came from Trussdoc and boo1 (mechanical!!!). RG88 mentioned rotation and screws. Both are...

Assuming the stack is in the USA, you may also want to refer to ASME STS-1, Steel Stacks.

PCA has a publication you need to use, entitled, appropriately enough, "Rectangular Concrete Tanks". I think the publication number is IS003.03D.

They've abandoned the lid portion of the design, but we now need to build a cast-in-place concrete wall adjacent to the pit to shield other equipment from possible explosions. The stored material is methanol (not methane, my mistake) and I have found references to methods for quantifying...

Need to design a concrete cover for a concrete methane spill containment pit (5'x25'x4'deep). It's sized for 3' of spilled methane with 1' extra to the bottom of any vents. Is there an industry generated code for the possible explosion pressure? What about depth of concrete cover for fire...

Try API 650 Appendix E for the lateral load due to sloshing.

There was an article published by ASME in 1980 entitled "Simplified Procedures for Estimating Settlement and Bearing Capacity of Ringwall Footings on Sand" (80-C2/PVP-64) that you may be interested in (my copy is poor). The authors were J.M. Duncan, P.C. Lucia, and R.A. Bell. Also...