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Recent content by jcali

  1. jcali

    Roof Top Equipment Platform Live Load

    Interesting. You're right, the commentary says 25psf. I wonder which governs? 40 psf doesn't make sense to me in some cases... For instance, if the equipment is sitting directly on the roof, you could use the minimum roof live load to cover the load from maintenance personnel. In many cases...
  2. jcali

    Roof Top Equipment Platform Live Load

    Actually, ASCE 7 now says 40 PSF for catwalks. Which still seems high if applied to the entire catwalk surrounding a large piece of equipment. -JCali
  3. jcali

    Roof Top Equipment Platform Live Load

    When providing a maintenance platform for a rooftop HVAC unit, what is the proper live load for this platform? The platform that I have in mind would be a steel frame supported by posts a couple feet above the roof with an open grating walking surface(In this case it would be added to an...
  4. jcali

    1951 Longspan Joist Puzzle

    We have lots of old joist catalogs in our office. We probably have the info you're looking for. Let me know how to get the info to you, and I can send you scanned pages. JCali.
  5. jcali

    AISC HSS Connections Manual

    I'm looking for an AISC HSS Connections Manual. It's no longer available from AISC (I checked the website and called AISC). Any ideas where I can get this? -JCali
  6. jcali

    Snow Melt Systems for Snow Drift on Existing Roofs?

    Thank you all. I appreciate your comments and insight. -JCali
  7. jcali

    Snow Melt Systems for Snow Drift on Existing Roofs?

    Hello, Do any of you have experience using radiant heat cables or other means of eliminating snow drift loading on an existing building roof? Does it work? Do Codes allow this? Any links to websites? I'd like to use this type of solution, if possible, to avoid extensive joist and deck...
  8. jcali

    T-Hangar Floor Drains

    Hello, I'm working on design of 5 unheated T-hangar buildings with a total of 49 hangar spaces. International Building Code says we need a floor drain in each space. Past practice has been that drains aren't required in "storage" hangars, only in open bay multi-plane "maintenance" hangars...
  9. jcali

    Fence Design Loads?

    What are the design loads for a fence? I'm designing a 10 ft high ornamental aluminum fence with vertical aluminum bar pickets spaced at 4" oc. What would be the design load to design a vertical picket spanning approximately 10 ft from top to bottom rail? -JCali
  10. jcali

    Concrete Tank Moment Distribution

    Thanks! So, what table would you use to design the bottom slab? I could see using figure 34 for steel at corner, but what figure would you use for top steel away from the corner? -JCali
  11. jcali

    Concrete Tank Moment Distribution

    I'm designing an open-top rectangular concrete tank. The walls are fixed to a base slab and free at the top. I determined fixed end moments of the wall and slab using "Moody Tables". Now I want to perform a moment distribution to determine the final moment at the base slab/wall interface...
  12. jcali

    How to Increase Pile Cap Capacity?

    The caps are already in place.
  13. jcali

    How to Increase Pile Cap Capacity?

    I'm a structural engineer working on a one story pre-cast concrete parking deck project supported by H-piles. Now that construction of the foundations is nearly complete, we've been asked if another level can be added (Until this point we had been specifically directed NOT to design for...
  14. jcali

    Overdesign Primary Structure to save labor cost?

    apsix, You're right. All constructive input is welcome. I'm sorry. -JCali
  15. jcali

    Overdesign Primary Structure to save labor cost?

    Constructive input to the question is appreciated. Preaching the obvious is not necessary. -JCali
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