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Recent content by penpe

  1. penpe

    Eccentric loading of a channel

    A C15x40 channel framed as a beam supports a load from an HSS4x4 tube column. The column load is axial and wind load lateral, parallel to channel length. The tube column is connected to the channel with bolts through the web, with the tube against the outer face (opposite the toes of the...
  2. penpe

    welding in 1958

    Thanks for that info, dik. The tank shell is A212-B 0.85" thick which I'm finding is 38 ksi yield strength, 70 ksi tensile strength (according to a couple of sources). The nozzle is called out as 4" diameter, material A181-1, 300# thickness. I've not yet researched what that means. My...
  3. penpe

    welding in 1958

    In evaluating the load capacity of a nozzle on a propane tank it appears that the weld strength of the connection could be a primary consideration. I typically use 0.928k per inch of 1/16" fillet weld for 70ksi electrodes for new welds, (0.3 x nominal tensile strength of weld material x...
  4. penpe

    Minimum Fillet

    thanks very much
  5. penpe

    Minimum Fillet

    We have in our reference library at work 2010 AWS D1.1 which includes a table 5.8 where minimum fillet weld is 5/16" when base metal is greater than 3/4", and I found the same is true for the 2000 AWS D1.1. Is it the same in the 2020 AWS D1.1? Thanks.
  6. penpe

    Slab on Grade allowable distributed load

    phamENG, here's my design approach: Arrived at 1" thick plate by using AISC Design Guide DG1 "Base Plate and anchor Rod Design" 2nd Edition. Small moment Base Plate design. Treated the round vessel like a steel column, used an equivalent square area to determine variables "d" and "bf". Base...
  7. penpe

    Slab on Grade allowable distributed load

    Thanks for the responses. This case is a temporary "staging" location of a 6.86 foot diameter, 42 foot tall vessel weighing about 46 kips. It will be on a 6" thick slab. My old CRSI handbook (1961) says 6" slab is good for up to 500 psf, but the vessel bottom plate area would impose over 1200...
  8. penpe

    Slab on Grade allowable distributed load

    I have an old 1961 CRSI design handbook which has a chart of slab on grade thicknesses and their typical applications, with recommended reinforcement, and a range of allowable distributed loadings: 4" slab good for light commercial 100 psf; 5" commercial 100 to 200 psf; 6" industrial 400 to 500...
  9. penpe

    anchors effective embedment depth

    In ACI 318-14 chapter 17 effective embedment depth (hef)is used in equations to determine concrete breakout strength for a single anchor in tension, and for anchor groups. 17.4.2.3 says Where anchors are less than 1.5 x hef from three or more edges the value of hef is reduced to the larger of...
  10. penpe

    effective embedment depth of anchor

    In ACI 318-14 chapter 17 effective embedment depth (hef)is used in equations to determine concrete breakout strength for a single anchor in tension, and for anchor groups. 17.4.2.3 says Where anchors are less than 1.5 x hef from three or more edges the value of hef is reduced to the larger of...
  11. penpe

    Cable try Ice loads

    oldrunner, no, our contract doesn't provide a thickness. The ASCE7-16 map gives nominal ice thickness of 1.5" for this part of Indiana.
  12. penpe

    Cable try Ice loads

    I'll admit that ASCE doesn't specifically address ice for non building structures, but Chapter 10 starts with this: "Atmospheric ice loads caused by freezing rain, snow, and in-cloud icing shall be considered in the design of ice-sensitive structures." And cable tray manufacturer Eaton states...
  13. penpe

    Cable try Ice loads

    Thanks for the responses. I did find that ASCE 7-16 says it is acceptable to multiply the ice volume for horizontal plates by 0.6, so that brings the ice weight down to 69 plf per ASCE. Maybe the average of the manufacturer's method and ASCE would be a reasonable compromise at 45 plf (using...
  14. penpe

    Cable try Ice loads

    Thread title should be "Cable TRAY ice loads". Damned spellcheck! (kidding)
  15. penpe

    Cable try Ice loads

    Outdoor cable tray is subject to the typical elements: Wind, Snow, Ice, Seismic. Our current project is located where the design ice thickness per ASCE7-16 is 1.5". Doing calcs according to ASCE the ice cross-sect area on each rail Ai = (pi) x ice thick x (channel diagonal measure + ice...
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