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Recent content by Gforce1

  1. Gforce1

    ASCE 7-22 Gust Effect Factor

    The only issue left is the printing of the equation for Rh etc. Is this a misprint and should it be: e^(2 * nh)?
  2. Gforce1

    ASCE 7-22 Gust Effect Factor

    Thank you bones206, that answers my question!
  3. Gforce1

    ASCE 7-22 Gust Effect Factor

    I didn't say they were. I have worked out the drag load on individual members. The structure is flexible and so this needs to be included in the calculation of the gust factor. The equations for the gust factor make reference to the overall building dimensions. I am trying to understand how to...
  4. Gforce1

    ASCE 7-22 Gust Effect Factor

    Is this a misprint; i.e. e^(-2*nh)? The equations although awkward do allow G to be calculated. However they use the overall building width/height; can I use this method for an open structure?
  5. Gforce1

    Talk me down, please

    Install temporary bracing? This could be formed from scaffold tube with gravock connectors clamped to the steelwork. It could possibly be installed from the outside. Design wise a reduced wind return period would be applicable. I think you need to ensure the stability of the building. If you...
  6. Gforce1

    ASCE 7-22 Gust Effect Factor

    Hi, I am looking for a couple of pointers regarding the use of ASCE7-22. I am more familiar with EN standards, but have some experience with ASCE for seismic design. I am working out the wind load on a large container crane, which I am considering as an open truss structure. My method is: 1...
  7. Gforce1

    S235JR vs S355JR Structural steels

    As discussed above S235 would be used primarily for ductility or cost reasons (at least historically). For primary structural steelwork, at least in the UK, many section sizes are not available in S235. Indeed in recent years S355 has all but replaced S275.
  8. Gforce1

    Bridge assessment to CS454 (UK)

    Hi, I am looking for a little help with traffic loading. It's very a UK specific question. Although not a bridge engineer (I work in Energy) I have to assess a reinforced concrete structure against traffic loading to the CS454 code. I have looked at the following cases: - Load model 1, CS454...
  9. Gforce1

    Geodesic Dome Roofs - Disadvantages / Issues during life

    Is it permissible to use aluminum? Aluminum construction tools/materials are banned on many petrochemical sites due to the possibility for unintentional sparks generated on contact between steel and aluminum.
  10. Gforce1

    Built up beams

    I will have a look at what the spacing of m20 hsfg bolts needs to be for no slip under factored loads. The surfaces will be grit blasted, so a slip factor of 0.5 should apply. Regarding the use of bearing bolts in clearance holes there is no consensus that this would be permissible? Given the...
  11. Gforce1

    Built up beams

    Post regarding corrosion is a good one. At the moment other than grit blasting and painting nothing in particular is planned. Ordinarily I would have specified sealing welds prior to painting. I guess I could specify an epoxy based strengthening measure that would seal the connection. I have...
  12. Gforce1

    Built up beams

    Hi, A fitted bolt is a bolt where the diameter and hole size are close to the same. A well known UK text (Cheal & Owen) describes these as follows; 'fitted bolts can be used where it is not practical to use a friction connection. Such holes must have a clearance on the nominal bolt diameter of...
  13. Gforce1

    Built up beams

    Hi Bridge Smith, Thanks. I agree with your reply and its certainly the approach I would take in a bridge structure or a structure subject to cyclic loading. In the UK I think we generally use bearing only behavior more often than in the US. This is evident in that to get this behavior the...
  14. Gforce1

    Built up beams

    Hi, First time poster. I am looking at a repair to a jetty structure where the entire top flange of a beam is to be replaced. In this instance the use of welding is not permitted, so I am proposing a bolted solution. On propping the beam the top flange, which is heavily de laminated, is to be...
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