Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: rwpe
  • Order by date
  1. rwpe

    Prefab Metal Building Steel Strength

    Thanks for your responses guys. I did receive a response from MBMA and they provided me a copy of a document, "Retrofitting/Reinforcing Metal Building Systems." It basically states that the transition to 50 ksi steel started in the 1960's and was for the most part complete by the 1980's...
  2. rwpe

    Prefab Metal Building Steel Strength

    In speaking with my colleagues here locally, it was understood that the prefab industry had been using 50 ksi steel as early as the 1970's. I was hoping to see if there was some historical information as to the steel used for those building designs. I have sent the question to MMBA but have...
  3. rwpe

    Non-Paying Clients

    I agree with the advice of just chalking this up to a business loss. On a side note, not sure how or if this applies, but a method we used to collect was to inform the building department of removal of our seal from the drawings. Basically, we contacted the building officials in our area to...
  4. rwpe

    Ladder Framing for Roof Outriggers

    For your circled condition, we have seen this condition previously. Our solution was to provide a double angle connector at the end of the cantilever beam attached to the beam with through bolts. The "flange" legs of the angles would be flush to the inside face of the rim beam with a steel...
  5. rwpe

    Prefab Metal Building Steel Strength

    I am involved in verifying the structure of an existing prefab metal building. The building was originally designed as cover structure with open walls. At some point following, walls were added and there appeared to be no retro-fit of the existing frames. For my analysis, I have hit a bump in...
  6. rwpe

    New wall footing adjacent to existing wall footing with different elevations

    You could cantilever a thickened slab or create beams at some spacing within the slab to allow the foundation to be pulled back from the wall. I would assume that the portion of the CMU wall from the slab up would need to remain as located. The wall would be supported on the beam element at...
  7. rwpe

    Ferrocement Water Tank

    I am currently designing a water tank per ACI 549.1R. The one question I have is what is the significance of the Specific Surface of Reinforcement (Sr) criteria? In going through the design, I have been able to meet the cracking criteria and the Volume Fraction of Reinforcement (Vf)...
  8. rwpe

    Anchored CMU Veneer Above 30' Height Limit

    No...I was responding more to the idea of the 30 foot limit. I agree that ties are needed for the veneer.
  9. rwpe

    slab bottom bars: how to overlab at best?

    I agree with Lion06....Make your splices lap over the support, assuming of course, that this is a horizontal deck and the loadings are typical in that you have negative moments over the supports and positive moment at the bottom of your slab.
  10. rwpe

    Anchored CMU Veneer Above 30' Height Limit

    Isn't the 30 foot limit for an unbraced height of 30 feet? Since you have floors at 13'-4", tie the veneer back to the floor diaphragm at each of those levels. And at least one or each of the floors, provide a shelf angle to "break" the veneer and reduce the impact of wood shrinkage.
  11. rwpe

    Compression Dowels

    I understand what you are saying about the shear friction. Without researching the exact particulars of the code reference for shear friction (Deadlines this week..lol), it would seem that the shear friction issue would need to be considered where shear reinforcing is required for the shear...
  12. rwpe

    Compression Dowels

    No...There no extraneous conditions for the concrete that would require a deeper embedment. The top mat of the footing/slab was detailed to have a 2" cover. The detail sketch I had provided was an as-built of the field conditions as relayed by the client and photographs of the rebar and formwork.
  13. rwpe

    Compression Dowels

    No...this is an electrical vault. There is no exposure to the elements.
  14. rwpe

    Compression Dowels

    I agree with you all that the condition is a very poor condition. Like I said earlier, the bars were tied by the contractor to the top mat of steel, and I was not given the opportunity to review the shop drawings or inspect the rebar prior to the pour. It was not detailed to tie into the top...
  15. rwpe

    Compression Dowels

    Hokie...That is argument I am making for this condition...Like I said, it was a condition that was placed by the contractor and was unfortunately not brought to light until after the concrete was poured.
  16. rwpe

    Compression Dowels

    Granted...IF the bar ever went into a tension condition, then I would agree with you. However, the condition, during the life of the vault, is that it will be under a constant soil pressure. Even should a condition occur where only one side of the vault is fully exposed, the side walls would...
  17. rwpe

    Compression Dowels

    Yes, these are wall verticals and at the bottom. Attached is a sketch I issued on the project.http://files.engineering.com/getfile.aspx?folder=cfb589a8-b19b-4223-8f54-f969be052d68&file=embedment.pdf
  18. rwpe

    Compression Dowels

    I have a project in which I have designed a concrete vault, completely underground. The walls were designed using a "fixed-end" beam analogy. Therefore, at the support ends of the wall, we have a negative moment where the inside face of the concrete is in the compression region of the beam...
  19. rwpe

    Beam w/ Pinned Ends = Instabilities?

    Back to your first question about the instability issue...For RISA 3-D, I rarely use the "pinned" boundary condition when you are creating a model that could be analyzed as a 2-D model, i.e. a single beam span in one direction. With the 2-D model, it is always assumed that your member(s) are...
  20. rwpe

    Steel Joists-Is mid-span bearing permitted?

    I would recommend against adding the mid-span support. There are couple of write-ups available that discuss the strengthening of bar joists. Unfortunately, I do not have the information to list here, but I do remember finding them through a search of the internet. A typical strengthening case...

Part and Inventory Search

Back
Top