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Recent content by TowerEngineer

  1. TowerEngineer

    Drag Force determination

    Hello sciguyjim: Sorry I didn't see your post earlier. Received a message from Eng-Tips that they have had trouble forwarding mail through my e-mail account. I have been looking for more textual references that list drag coefficients for a variety of objects with different shapes. Much the...
  2. TowerEngineer

    One-third stress increase

    JAE- I've been unable to find my copy of article "The Mysterious 1/3rd Stress Increase". But if you go to the following link you can get a copy of the article for $15.00. Alternatively, you can order all past issues of the AISC Engineering Journal on CD-ROM for $150.00. Here is the...
  3. TowerEngineer

    One-third stress increase

    JAE - I have a copy of the article "The Mysterious 1/3rd Stress Increase" somewhere in my archives if you still need it. Let me know.
  4. TowerEngineer

    A little info w.r.t. design of Eiffel Tower

    JAE - A one-third scale re-production of E.T. was recently constructed in Las Vegas, NV. Tthe engineers that designed the replica used a digital computer model to analyze it. Las Vegas is in UBC Seismic zone 4 (highest level of earthquake risk and ground shaking). Their reproduction is...
  5. TowerEngineer

    guyed stack design

    I guess it's time for me to add my two cents to the discussion with regard to guy wire galloping and aeolian vibration, and guyed and self-supporting structural vibrtations in general. Guy wire galloping is usually the result of the guy wire pretension force being set too low, whereas aeolian...
  6. TowerEngineer

    what is this "hair pin" thing attached to anchor bolts?

    There is more than one definition of the term 'hairpin' used in construction. The reinforcing steel industry refers to supplemental cross ties as 'hairpins' which I think you are now familiar with based on the foregoing discussion. There is another form of 'hairpin' used in my industry (guyed...
  7. TowerEngineer

    Stiffness Matrix Software

    The best text I've found to date is 'Matrix Structural Analysis' by W. McGuire and R.H. Gallagher, J Wiley and Sons, 1979. The complete element stiffness matrix is developed with many examples throughout the text which demonstrate the use of stiffness matrix methods. As far as a stiffness matrix...
  8. TowerEngineer

    Imminent Failure Criteria For Steel Beams

    Just a couple comments to add to this discussion. We typically use an allowable bending stress for beams with full lateral support: Fb = 0.66Fy for Strong-Axis - Compact Section designs. In general, beams will not fail until a full plastic hinge has formed creating structural instability...
  9. TowerEngineer

    Selection of a structural engineering software

    I too use Multiframe 4D as my primary structural analysis tool for general frame analysis. It's graphic user interface (GUI) input for both the structure and loads permits very fast and error free analysis. I started using the product very early in its development (beta user) and have not...
  10. TowerEngineer

    Structural Engineer Tools

    Calculator: TEDDS by CSC (works within MS WORD 2000, 97, NT) Struct. analysis: Multiframe4D by Formation Design (very easy modeling capability, graphic interface for modeling and loads, very easy to select and combine load cases, automatic generation of dead loads, includes non-linear and...
  11. TowerEngineer

    Size of Building requiring a PE

    The California model and the Uniform Building Code require that all building structures (other than residential) over 6 feet in height and more than 120 square feet require the stamp and 'wet signature' of a registered professional engineer. Retaining walls over 4 feet tall also require a PE...
  12. TowerEngineer

    A little info w.r.t. design of Eiffel Tower

    I think the following info may interest some individuals in the world of structural engineering. As you probably already know: E.T. is 990 feet tall, is constructed of wrought iron, was built in 1887-89, and was designed by the great Gustave Eiffel. Now for what you probably dont know. The...
  13. TowerEngineer

    Drag Force determination

    AeroStudent and vtl: We engineers have known of the basic force equation F = 1/2(d/g)V^2 since the time of Sir Isaac Newton (we all stand on his shoulders). Since the 18th century, we have also known that this basic equation must be modified by a drag coefficient. The primary difficulty has...
  14. TowerEngineer

    Angle Bending Stress

    Also see the commentary section immediately following which begins on page 5-315. Seven references are included at the end of the commentary section which, together with the commentary, can further help in understanding the principles that go into the AISC specification.
  15. TowerEngineer

    Anchor Bolts: B-212 Specification

    JAE, The specification applies to an anchor bolt set that was installed during construction of a project in Turlock, CA. I think the bolt spec may be a Canadian or British standard?? Taro, The application appears to be threaded anchor bolts with a 90 degree bend at their lower termination...
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