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  • Users: LPPE
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  1. LPPE

    NOAA to ASCE 7

    I have a job where the wind load requirement is to use the NOAA Category III Hurricane wind speed of 130mph converted to ASCE 7-10 basic wind speed for structural design This is fairly simple in this case, Table C26.5-2 in ASCE 7-10 gives the approximate relationship between NOAA and ASCE 7...
  2. LPPE

    Bethlehem Old Joist catalog

    Over a decade ago, I had Bethlehem Old Joist catalog values, and needed a Macomber catalog (thread507-17733). Well, I found the Macomber material back then. Now, I can't find any catalogs for Bethlehem joists. The existing joists are essentially hat channels for top and bottom chords. A...
  3. LPPE

    Z Purlins - Revisited

    I have an existing PEMB, built by American Buildings. At least I think it was. Old logo on the building says American, and the roof Z purlins are 9.5" deep. The only PEMB company that makes 9.5" deep Z purlins is American Buildings, as far as I know. Anyway, my client wants to add parapets...
  4. LPPE

    Old Column Size

    I have existing building plans, and a column schedule that lists diameters. A note at the bottom of the column schedule reads "All cols. are conc. filled H.W. steel pipe columns.". Does anyone know what H.W. steel pipe columns are, and have any information on them? Drawings are dated 1956.
  5. LPPE

    IBC09 1810.3.13

    I have a deep foundation job, and we're driving HP shapes with concrete pile caps. I have some isolated pile caps with no structural slab. This job is designed using the IBC09, and I have a seismic design category "C". Seection 1810.3.13 Seismic Ties states individual deep foundations shall...
  6. LPPE

    Composite vs. Non-composite Steel Beams

    What would be the cheaper way to do it? If steel beam depth is not an issue, would it be cheaper to design the floor beams as non-composite? Obviously, with composite design, the weight of the steel beam is less, but is the savings in steel weight then offset by the labor to install shear...
  7. LPPE

    Roof Purlin Support

    I have an existing prefab metal building. An insurance carrier has questioned the lack of roll clips at the roof purlins. The roof purlins are 9" deep 16 ga. C sections. They are lapped 48" over the supports. Between the lapped C purlins is a 16ga. plate. The plate is sandwiched between the...
  8. LPPE

    Open Web Wood Trusses

    I have a multi-story project that will require open web wood trusses (parallel chords) for the floors and roof. Can anyone recommend some manufacturers? Longest span is about 26 feet. I found one manufacturer that appears to handle that span, TrimJoist. I'd like to have some other...
  9. LPPE

    HP Pile Points

    I'm driving HP piles through some rough fill, which may include obstructions ranging from telephone poles to automobiles. Can anyone recommend a pile point to use for these conditions?
  10. LPPE

    Precast Concrete Floor Joists

    I have an existing floor system. Floor slab appears to be the Steeltex system. The slab is then supported on what looks like mini concrete bulb-tees at 2'-6" oc. At first, I thought it was encased steel joists, with the encasement used for fireproofing reasons. Then I discovered a cut joist...
  11. LPPE

    Poured in Place Gypsum Roof

    I have a poured in place gypsum roof deck. It appears to be poured on fiberboard panels. There are steel bulb-tees at 24" oc that support the fiberboard panel edges. Does anyone have any ideas on how to successfully cut openings in this deck for RTU's, etc? How do you support the cut edge of...
  12. LPPE

    Wood Framed Geodesic Dome

    I have a wood framed geodesic dome that needs to be re-sheathed. Can all the existing sheathing on each facet be removed at once for the entire dome, or should each facet of the dome have the existing sheathing removed and then replaced one at a time?
  13. LPPE

    Recycling bricks

    I'm doing an investigation of an old abandoned, large, multi-story facility. The floors and roofs are wood framed, and the walls are multiwythe brick. The floors and roofs are completely shot, and cannot be reused. The brick walls are also in very poor condition. Basically the building has...
  14. LPPE

    Shear-Friction and Intentionally Roughened Surface

    Citing ACI 318-02, Section 11.7.4, there is a coefficient of friction factor, with different values for hardened concrete, roughened or not. Is it possible to intentionally roughen an existing hardened concrete surface? Suppose I have the smooth vertical face of an existing concrete wall or...
  15. LPPE

    Aluminum vs. Steel

    I have two arched trusses (arched top chord, flat bottom chord) that span about 46 feet. Trusses are parallel to each other, about 3 feet apart. Architectural details show tube steel members. I've designed them using steel and ASD. Now the architect wants to try aluminum. I told him he's...
  16. LPPE

    Welding Stainless Steel

    I have a job where stainless steel plates will be welded to HSS, W shapes, and C shapes. What electrodes should I be using? My general steel notes say use E70, but I usually never have stainless on the job. What should I put in my general note for weldining stainless to regular?
  17. LPPE

    Florida Special Inspections

    Does anyone have a sample Florida Statement of special inspections form, or know where I can find one on the web? Or is my typical form from my region of the country (north east) acceptable in Florida?
  18. LPPE

    Waterproof Mortar

    I have a job with load-bearing concrete masonry shear walls. The architect wants me to include a note in my drawings saying "Masonry to be Dry-Block with waterproof mortar". Dry-Block is an admixture in the CMU that gives it a level of water repellency. I don't know what waterproof mortar is...
  19. LPPE

    W Beam Lintel and Unbraced Length

    I have a W beam lintel, supporting CMU. First course of CMU on top flange is a bond beam with 2 bars, and shear studs on top flange of W beam at 16" oc. Masonry wall runs 10 feet up clear before intersecting roof elements. Question is - Does the CMU (bond beam or other) brace the top flange...
  20. LPPE

    Intermodal Shipping Containers

    Does anyone know where I could find plans on how intermodal shipping containers are built (typical 20 or 40 foot by 8'6")? Looking mor for dimensional purposes. It looks like the containers bear at the 4 corner points only, but cannot be sure. A 40 foot span seems like a lot, but if the 40...

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