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  1. Johns20188

    Shear Flow of Components with Same Neutral Axis

    I've been keeping up with the thread below: https://www.eng-tips.com/viewthread.cfm?qid=468603 There's a lot of great discussion regarding shear flow of members that share the same Neutral Axis. From the thread responses, it seems that there is no shear flow between the members that share a...
  2. Johns20188

    Welding on a Beam

    Longitudinal shear/shear flow IS the result of differential bendinging stress over an infinitesimally small length along the longitudinal length of the beam. The bending tensile and compressive stresses on the cross section cause there to be internal longitudinal shear stress to resist them...
  3. Johns20188

    Welding on a Beam

    . What is the difference between the shear flow calculated in my sketch and the shear flow calculated in your book's figure 7-15 c and b?
  4. Johns20188

    Welding on a Beam

    JP20, As I understand it (please correct me if I'm wrong), the shear flow result, H, is derived from bending stresses as you can see from the calc in the sketch above. And H is the logitudinal shear that needs to be resisted, resulting from the bending stresses, and is in units of force/unit...
  5. Johns20188

    Welding on a Beam

    There is shear flow in strong axis bending isn't there? If it were a fully solid composite section wouldn't the shear flow sort of look like what's shown in my sketch? I think you would need to use the shear flow equation from the top protruding plate web to the welded joint. As shown on the...
  6. Johns20188

    Pretension Shear Equation

    Rapt, I guess the reason for this thread was that, initially, it was just a little confusing why Vi was multiplied by Mcre/Mmax while Vd was on its own. I could just read the commentary and accept that for some reason Vd alone accounts for the precomposite decompression part. But this thread is...
  7. Johns20188

    Welding on a Beam

    Canpro, If the load is being applied to the plate edge, would you have to calculate shear flow to get the load into the channels?
  8. Johns20188

    Pretension Shear Equation

    Thank you for the replies, everyone. That decompression explanation really cleared it up for me. Basically, the ratio of your moment to your cracking moment determines how much of that shear is being resisted by the prestress. The remaining shear is checked against the RC-like shear...
  9. Johns20188

    Pretension Shear Equation

    Thank you very much retired13! I'm interested in reading the pages in your second to last post, however, the link is not working (seems like it's a folder address). When you have some time can you re-link it? Thank you.
  10. Johns20188

    Pretension Shear Equation

    Thank you everyone for the responses so far. Sorry, yes this is pre-tensioned topped hollow core planks. I heard the shear equations may not be accurate for deep hollow core planks, however, the one I am checking is 10" deep with 2" topping. I still need to read your article retired13. The...
  11. Johns20188

    Pretension Shear Equation

    Hi everyone, I am looking at using equation 22.5.8.3.1a from ACI 318-14 to calculate shear capacity of topped prestressed hollow core plank. What confuses me is why does the shear capacity depend on Vd, the shear from unfactored dead loads? Why does our capacity increase as Vd increases? It...
  12. Johns20188

    Calculation Efficiency

    I find that I often spend too much of my engineering fee on design calculations rather than developing drawings and end up not having enough fees to complete the drawings. How much time do you spend on calculations vs drawings? For example, do you spend 50% on calculations, 50% on drawings...
  13. Johns20188

    Components & Cladding on all members?

    Hey everyone, I have two quick questions: 1. When designing individual roof members (joists, rafters, purlins, etc), I know we need to use components & cladding (C&C) to find the uplift and downward wind on the member. However, do we also use C&C loads on the girders that carry those roof...
  14. Johns20188

    How did you "learn" to become good enough to run a complete design?

    When you first started as a structural engineer, what was your method of learning how to design and become familiar with the code? I just started my structural engineering job a couple months ago but I feel I cannot design a building entirely by myself. I am starting to read some books but I...

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