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  1. enginerding

    1974 Concrete beam and joist schedule

    I am evaluating an existing floor for the weight of a nuclear medicine scanner. The structure is concrete joists and slab with concrete beams. One bar placement and bending diagram is provided that includes both joist and beam details. The typical top bars, bottom bars, and bent bars are...
  2. enginerding

    Grouting deep masonry beam

    I have a project with a 40" deep (5 courses) reinforced masonry beam. The mason is proposing to build this and grout this one course at a time. He would build it like 5 bond beams on top of each other. I cannot find any notes in ACI 530 regarding grouting beams in multiple separate pours. Is...
  3. enginerding

    FOIA requests yields calculations

    It is my opinion that the end product of a structural engineer is the construction drawings. While I have no problem submitting my calculations to a building official to help them with their due diligence while they do their plan reviews, I do not believe these to be a part of the public...
  4. enginerding

    Reinforced gypsum concrete

    I am working with an existing building with a reinforced gypsum concrete roof on bulb-tees on steel joists. I have downloaded the information from the gypsum association from this website. The 2006 IBC includes very little information in Section 1914. The old UBC has more info. The 1994 UBC...
  5. enginerding

    66% Shelby tube recovery

    I am looking at a soil report that I need to use to design a foundation. Maybe I should first mention that about 75% of the text of the report discusses what was not done and what is not covered, and some information on local tort law. In the text of the report, there are three locations that...
  6. enginerding

    Three-wyth, unreinforced, freestanding wall

    I have a client who is dealing with an existing mechanical enclosure without a roof constructed of three-wythe masonry. His client wants to punch 4' wide x 28" tall holes near the bottom of this wall for additional ventilation. Building is only 5 years old, but there are no drawings for this...
  7. enginerding

    Biaxial compression in steel membrane structure

    Does anyone have a good reference for designing for biaxial compression in steel plates for water storage structures? AWWA D100 provides membrane buckling capacities where the stresses are uniaxial compression or compression with hoop tension, but states that biaxial compression is beyond the...
  8. enginerding

    Steel structure for digital billboard on 120 year old wood balloon-framed building

    I have a client who wants to support the steel structure for a digital billboard on the roof of an old wood balloon-framed building. There is currently a billboard on the roof, but this new structure will weigh much more. What are your thoughts about supporting a heavy steel structure on wood...
  9. enginerding

    Flexible Moment Connections (PR, Type 2, etc.)

    We are helping a fabricator with some connection design where the EOR simply provided drawings that specified "Steel fabricator shall provide full moment connection between all beams to columns with the design of full capacity of the section". We were directed to provide field welded...
  10. enginerding

    Steel grades AISI 1526 vs API 5L-X42

    We have a condition where we specified API 5L-X42 pipe for a billboard column and the client would like to increase the height. We asked for mill specs of the pipe to verify strengths and the client could not produce any. So we had the pipe tested. The test showed acceptable tensile and yield...
  11. enginerding

    Request for winning proposal

    Through the years, there is an architect who sends us RFPs relatively often. Our proposals are selected about 5% of the time. I am getting the impression that they are only requesting our proposals to say the received them from X number of companies. Before I submit another proposal to this...
  12. enginerding

    Shear Strength of Expanded Metal Grating

    I have a situation where there are some catwalks constructed of 3 psf expanded metal grading welded at 8" o.c. to perimeter angles. If I can get this to act as a diaphragm (which I know it will to some extent) I can avoid adding cross bracing directly beneath this grating. Does anyone know...
  13. enginerding

    Plan reviewer requesting electronic copy of structural design model

    I don't know exactly where this question should be posted, but I think this might be as good a place as any... I have recently received plan review corrections where one of the corrections was "provide e-file of the RISA-3D." Questions: 1. Has anyone else received this request from a plan...
  14. enginerding

    Does AASHTO apply?

    Another engineer in our firm has been asked to design some bridges for golf carts on a golf course. The golf course wants to be able to drive maintenance vehicles over the bridges as well, so they requested HS20 loading. How do I find out what code applies? I looked up the town's code of...
  15. enginerding

    Cadmium plating of A325 bolts

    We have been asked by a client to specify cadmium plated A325 bolts. I checked the ASTM Spec to see how to call that out, and it does not provide any information. I could not find any prohibition for cadmium plating of A325 bolts, but I also could not find anything that said it was...
  16. enginerding

    Peru Building Code

    Does anyone know of the building code structure of Peru? Do they have a national code, or does it vary from municipality to municipality? Is it similar to any other major code? Any info at all? Thanks!
  17. enginerding

    Fy = Specified Minimum Yield Stress

    I know how Fy is defined in AISC and I know how we are "supposed to" use that for all our design equations. I have a condition where an existing piece of steel pipe was tested for strength. The yield strength measured in the test is a touch over 40 ksi. If I assume this is 35 ksi steel (ASTM...
  18. enginerding

    Good textbooks or references on membrane covered frames

    I am looking for recommendations on good textbooks or other references for fabric-covered frame structures. This will not be pressure inflated. Our client wants us to design only the frames and not the membrane itself. "Design it assuming that the fabric gets the loads into the truss, but...
  19. enginerding

    Doing business in another State

    I have a few questions that basically revolve around whether or not it is required for a company to file as a foreign corporation in another state. Suppose I am a licensed engineer at a small firm with only 1 office, in State A, and I am hired by a client who also has an office in State A. The...
  20. enginerding

    Ride the fillet

    I remember seeing somewhere in some reliable source mention of an allowable amount of "fillet ride" in a connection. I can't find this anywhere now, but I thought it was on the order of 1/16". What I mean by this is how far onto the fillet is a bolt/nut allowed to be in a connection at the...

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