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  • Users: CPBe
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  1. CPBe

    seismic supports straddling building expansion joint

    Looking for some insight on how to accommodate building expansion in some seismic supports for rooftop ductwork. Building expansion in 1 direction is one thing, but I'm unsure how to handle 2 directions. See sketch below: Currently thinking some canvas duct when crossing the E-W expansion could...
  2. CPBe

    Seismic bracing for in-line components

    Looking for some input/interpretation on a somewhat vague paragraph in ASCE7 ch.13 - see excerpt below: Suspended components that are installed in-line and rigidly connected to and supported by the piping system, such as valves, strainers, traps, pumps, air separators, and tanks, are permitted...
  3. CPBe

    beam load off center

    Have an issue with a large piece of equipment sitting off the web of the main support beam - see sketch below: Field crew claims the web is bending inward along with the top flange, and the member isn't even fully loaded yet. What, in your opinion, would be the most economical approach to...
  4. CPBe

    Q: reinforce existing beam for new RTU?

    Looking for some input on an existing roof structure. Field-gathered info indicates the existing structure was designed for a 30 psf roof load. When the added weight of a 3.1k RTU is introduced beam deflection exceeds L/240, so I'd like to reinforce per the following schematic: Trying to keep...
  5. CPBe

    reinforce existing i-beam

    Hello all, I have a somewhat unique issue that I've been tasked with and would appreciate feedback from an experienced group. There is an existing roof structure (which all preliminary calc's indicate was designed to hold roof construction, live load, & some snow) which is getting a new 2,600...
  6. CPBe

    Fasteners subject to Bending

    Hello all - hoping to get some input on an issue that arose on a job. A contractor (who went a bit off script) had provided a typical leveling frame for rooftop units which were anchored to resist shear & uplift wind forces - see following sketches: The fastening/anchoring method appears to...

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