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  1. BurgoEng

    Design Storms for Saudi Arabia???

    I know this is a long shot, but does anyone have any idea how/where to obtain reliable info for stormwater design regulations, standards or even just rainfall intensity and/or precipitation requirements for Saudi Arabia? Best I can find is sime NOAA info for average monthly rainfall. I'm...
  2. BurgoEng

    ASCE 7-02 - Open Building - Load on Roof

    I have a simple 4 column "shed" with no walls, about 20ftx30ft with h=15ft. I am trying to figure out the wind load to apply to the roof. According to section 6.5.13, (Eq 6-25)F=qz G Cf Af. Cf is taken from Figure 6-18, based on the B vs L of the roof as well as the angle. I've got that. My...
  3. BurgoEng

    ACI 318 App D - anchor effective depth limit?

    We typically have very high loads and per our company standards, this ends up requiring longer than typical embedment depths for anchor bolts/rods. I'm using 318-02 for a design right now, and D.5.2.2 gives the equations for breakout strength, but only provides equations for up to 25"...
  4. BurgoEng

    End Plate with hole? how to size?

    Here is a crazy plate design I am trying to work out. I have a square (10"x10") end/cap plate with a 2"dia hole at the center. The plate will be welded on 4 sides to a steel "box". Through the hole is a bolt with a washer/nut on the back-side. This bolt will be tensioned so that the 10x10...
  5. BurgoEng

    Conc Ret Wall on Rock, w/ embed rebar dowels, procedure?

    I would like some input onto the procedure I am going with to figure out this situation. And also because I know this will come up again on other projects. Thanks in advance... Situation: 8ft concrete retaining wall in which rock has been encountered at a shallow depth. Footing width was...
  6. BurgoEng

    Soil above shallow footing included?

    I have always accounted for the weight of soil above the top of footing when designing simple, isolated shallow footings. Typically, a footing will be in the neighborhood of 4'x4'x1'thk and about 3ft below grade, so that there would then be 2ft of soil above the top of footing. I have always...
  7. BurgoEng

    Splicing Anchor bolts with pier Reinf?

    I have looked on this site and almost found my answer but it was completely discussed. I'm sure there is a way to justify how uplift load would transfer from an anchor bolt into the reinf of a pier, but I am not sure how to go about figuring it out. My particular situation is that my pier is...
  8. BurgoEng

    ACI Appendix D

    Has any of you managed to decipher Appendix D enough that you've been able to make an Excel sheet to take care of all the nuances? I would like to have a sheet for this appendix as I dont have a need to design anchor bolts very often and each time I do, I need to re-teach myself how to use App D.
  9. BurgoEng

    Masonry - minimum reinf req'd?

    I am trying to figure out the need/requirement for minimum steel in a masonry wall. My specific problem is amount of steel needed for an 8" foundation/basement wall. The wall is 4ft below grade on both sides, ie no unbalanced load. In some references I see As(min) = 0.002Ag with no less than...
  10. BurgoEng

    Masonry - radius of gyration and section properties

    Intially, I was going to simply post a question about how to obtain the radius of gyration(r) for a masonry wall, because it is needed per ACI 530 for axial load capacity. I managed to finally find a table from the NCMA manuals (TEK 14-1A), that gives the "r" value for various reinforcing...
  11. BurgoEng

    Masonry bearing wall, supporting steel beam, joist, post...

    What is the typical connection "style" for attaching a steel beam, steel open web joist, steel posts, etc... to a masonry bearing wall. I was under the impression it typically involving a bearing plate bolted or welded to the "to be supported" member and then that plate being bolted to the wall...
  12. BurgoEng

    Cold weather Masonry

    I'm trying to determine if a masonry foundation wall for a warehouse building that was installed the day that a 2-day cold spell hit, is acceptable or not. I dont' beleive any measures were taken to keep the wall warm (blankets, heaters, etc...) as is stated should be done in the ACI 530 manual...
  13. BurgoEng

    Deflection limits...not just L/360

    I know typically deflection limits for LL is L/360 and for D+L it is L/240 in general for stell framed construction(offices, apartments, etc...). I have always used a rule of thumb of limiting deflection to 1/2" total, which usually causes a ratio in the neighborhood of L/500 or so and gives me...
  14. BurgoEng

    Do shear studs at top flange provide lateral support?

    I have a 6-story steel beam(&joist) with concrete slab and masonry bearing wall residential building with 2 levels of parking at bottom floors. We are not considering composite action for the steel beams, and the concrete slab will not have a metal deck. I would like to use shear studs at...
  15. BurgoEng

    Welded wire FABRIC or MESH

    Is there a difference between the term "fabric" and the term "mesh"? I have always referred to it as fabric, but a colleague suggested that a mesh and a fabric are different terms to be used based on the gage of the wire.
  16. BurgoEng

    Concentrate uplift load on masonry wall

    In short, I have a new column supporting a new roof, and the column is resting on an existing 12" fully grouted CMU wall. The estimated uplift load due to wind onto this column is 10k. Therefore, I need to anchor the baseplate of the post to the CMU wall, to resist this load. I can't seem...
  17. BurgoEng

    Reinf Spacing limits for concrete column/pier

    I understand that longitudinal bars but be within 6" of a corner of a tie. However, is there a limitation on the maximum allowed spacing of the longitudinal bars, regardless of corners? I had always thought it was 12", but I can't find the reference for this. Example, 10" x 20" col. I want...
  18. BurgoEng

    vertical and lateral earth pressure - length req'd

    This may be the most basic of concepts, but these are the things that always leave me scratching my head. Generally, lateral pressure is based on At rest, active or passive pressure, dependent upon depth and friction angle. So at a depth z, the lateral active pressure would be pa=Ka g z...
  19. BurgoEng

    Shear/Tension capacity of rebar?

    I think is this probably a stupid question, but I'll be damned if I can't figure it out or find it anywhere in my texts. I think it would simply be As x fy. But that seems too simple. I guess maybe you need to multiply by a phi value as well...0.7, 0.8? I am asking because I am trying to...
  20. BurgoEng

    Dowelled Ret Wall Footing, into rock?

    I have a retaining wall (about 10ft retained)that will have the footing supported directly on bedrock. I am assuming 10000psf bearing capacity. The Client now would like to reduce the width of the footing, which was initially about 8ft heel and 2 foot toe. I can reduce the width to about a...

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