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  1. nhtr86

    Seal on calcs but not on plans

    I have a strong opinion about this but I wanted to see if there were differing opinions: Licensed PE A "designed" a pole building by selecting the overall dimensions and layout, but engaged licensed PE B to handle the structural calculations and detailing. B provided sealed structural...
  2. nhtr86

    Governing design standards for material handling equipment in paper mill

    I was asked a question about a hydraulically actuated arm in a paper mill that handles stock. What design standard would apply to this situation? I typically work in structural where the design of a steel component would commonly be governed by the AISC code or the AASHTO bridge code. I am...
  3. nhtr86

    Partial Pen Weld BTC-P5

    Looking at AWS D1.1 2010 pg 80. Figure 3.3, Joint Designation BTC-P5. It shows minimum plate thickness as 5/16", minimum root face of 1/8", and effective weld size of S1+S2-1/4. So 5/16"-1/8"-1/4" should be the effective weld size for 5/16" plate but that number is negative. The 5/16" minimum...
  4. nhtr86

    AASHTO LFD for tension members

    I know that I am not the sharpest guy with the AASHTO code, but I am really missing the boat here somewhere. I am trying to use the Strength Design (LFD) provisions of the 2002 code to check a large diagonal brace in a bridge bent. It can experience 230 kips of tension or compression. Section...
  5. nhtr86

    Biaxial Shear and Mohr's Circle

    Imagine one of those stress cubes that were so popular in college. I apply a shear stress to the top surface in one direction (V1) and a larger shear stress in the perpendicular direction (V2). No normal stresses are applied. Now, if I plot the 3d Mohr's circle for this, it should be a circle...
  6. nhtr86

    Concrete T beam flange thickness minimum

    ACI 318-05 8.10.4 requires that the flange of a T beam be at least half as thick as the web is wide. Does anybody know why this is? I have a T beam with h=37" bf = 60" bw=26" and tf=9". It seems crazy that you could engage the flange with a narrower web, but not with a wider web. Also, this only...

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