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  1. 14159

    Concrete is cool

    No subject -- just wanted to bump that "strut and tie modeling" thread from the top because I'm tired of seeing it every time I click this forum's link!! 14159
  2. 14159

    New Table J2.3 Watch Out!

    Check the new Table J2.4 -- minimum size of fillet welds. For as long as I've been around, the minimum size has been based on the thicker of the parts joined. This table uses the THINNER part. I checked with AISC for this and it is correct. It would be interesting to know how many people read...
  3. 14159

    Frequency-Response from ABAQUS

    Is it possible to get a frequency-response plot from abaqus? I currently use SAP for floor vibrations research and, best I can tell, it won't produce anything resembling a Fourier amplitude spectrum. Any help would be greatly appreciated. DBD
  4. 14159

    FFT from SAP

    I use SAP2000 for floor vibrations analysis. Does anybody know how to get a frequency-response plot from SAP? I've worked on this a while and don't see any way to do it other than pulling out an acceleration trace and doing a FFT or DFT in Mathematica, Matlab, Mathcad, or Excel. While not...
  5. 14159

    composite framing design

    I reviewed ETABS for our office a couple of years ago and found heinous bugs in the composite beam design features. Can anyone comment about the current composite beam design capabilities? DBD
  6. 14159

    Frequency-Response From SAP

    Any info would be greatly appreciated. I'm doing floor vibrations research and need to be able to get a frequency response plot from SAP for the floors I'm modeling. I currently have time-history analyses with sinusoidal forcing functions. Is there a good way to get a FFT or other such output...
  7. 14159

    Good advanced steel book

    Can anybody recommend a good structural steel book? I have S&J and Englekirk, but am looking for something that gets very deep into underlying theory. For example, the origin of the h/tw ratios in Chapter B of the Manual. Can anyone recommend Galambos' book? I've heard that McGuire (or...
  8. 14159

    Cw for an unsymmetrical I-shape

    Does anyone have a solution or reference to a solution for Cw for an unsymmetrical I-shaped structural steel beam? I spent 2 hours yesterday looking through my advanced mech of materials, cold-formed steel design, structural steel design, AISC Manuals, AISC Torsion DG9, internet, etc, and...
  9. 14159

    AISI Web Crippling Question

    How should one define the web crippling bearing length, N, for a roof panel resting on a member with curved edges? For example, a HSS or a cold-formed Zee or Cee shape. Are these equations precise enough to warrant subtracting the curved portions, leaving the flat HSS or Zee dimension as "N," or...
  10. 14159

    2005 AISC Spec Beam-Col h/tw ratios

    The 1989 and 1999 Specs both have an entry in Table B5.1 called “Webs in combined flexural and axial compression.” I don’t see any entry in the 2005 equivalent table to cover beam-column webs. I think that a dogmatic reading of the table would lead one to use Case 9 or 11 for any I-shaped...
  11. 14159

    A449 Double-Ended Bolt

    I have a very light steel rafter to cold-formed roof joist connecton. I was planning to make this connection with 1/2" A325 bolts, but there is a better product for this particular connection. It's a double-ended A449 bolt that I found. Detailing considerations make this a far better connection...
  12. 14159

    Getting Started in Tower Design

    I recently went back to grad school and have a little more freedom to study topics of interest. For a long time, I've been interested in communications tower design. You know -- those heinously tall ones. My background is in building design and I have no idea where to start. I would appreciate...

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