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Recent content by chichuck

  1. chichuck

    ASCE 7-10 - Wind Load on Box Truss - Fig 29.5-2 or 29.5-3

    andysines, I favor using Figure 25.9-3 for a trussed tower. To use this correctly, the Cf is calculated using the solidity ratio on the windward face. The exposed area should be I think, the exposed area of the windard face. The coefficient in the Figure gives the total wind force on both...
  2. chichuck

    balancing of rigid shafts

    Greg & dhengr, thank you for the references, I will check both of them out. Electricpete, thanks also for that referral. I’ve got a copy of that, and looked at it carefully when considering concrete and geotechnical aspects of the foundation design. But I had skipped over the parts about the...
  3. chichuck

    balancing of rigid shafts

    Greg, No, I haven’t read a book on the subject. I have looked in several books on vibration and on machine design. Also at a number of articles on rotating shafts, vibration of shafts, machine maintenance, etc. None of them deal with the subject at all completely. Just bits and pieces that...
  4. chichuck

    balancing of rigid shafts

    Greg Lacock, Thank you for your quick response. Your short answer explains a lot to me, and also gives rise to many new questions about this balanced rigid rotor. I’d like to summarize what I think is the condition of the balanced turbine rotor. First, the turbine rotor has several stages...
  5. chichuck

    balancing of rigid shafts

    I am developing a spreadsheet for analysis/design of foundations for vibrating and rotating equipment. This post is about input for that design, specifically the eccentricity of the rotor(s) in a turbine generator. It also should be applicable to other types of rotors as well. I am...
  6. chichuck

    Array used to look up a value in matrix

    lexcognito, Note: in your original worksheet, you had A.i rather than A[i, hence the error as the range variable should (usually) appear on the left hand side of a definition if it's on the right hand side. Wow! How did you figure that out??! Onscreen, those two look the same to me...
  7. chichuck

    ASCE 7-05 Figure 6-23 Trussed Towers

    Rfreund, 1) I would only figure the exposed area based on the windward face members and not consider any of the "unshielded" members on the leeward face. 2) Your point about applying wind to the leeward face of a structure comprised of 2 lattice frames is conceptually correct. However...
  8. chichuck

    ASCE 7-05 Figure 6-23 Trussed Towers

    bjb The following quote from the indicated publication answers your question about Fig. 6.23 in ASCE 7-05. THis is from the guide to the wind load provisions in ASCE 7-02, but the table in ASCE 7-05 is the same. Guide to the Use uf the WindLoad ?ruvisions of ASCE7-O2 Kishor C. Mehta...
  9. chichuck

    Dynamic load

    biendung1304, You definitely need more information about the crusher. I doubt you will find the needed information in any text or handbook. You will need things like the dynamic loads applied, including direction, frequency, ampltude and point of application. Also the cg location...
  10. chichuck

    ASCE 7-10 Summary of Updates

    SEgeek4, Below are two links to a book published by ASCE that goes into great detail on that subject. I have access to it on a company paid subscription service, so I didn't have to buy it myself. But I found it a good reference...
  11. chichuck

    Foundations - Vibrating Machines

    Sorry for the typos in my previous post. chichuck
  12. chichuck

    Foundations - Vibrating Machines

    Egnorant, I have recently been studying the same book. I too have been working on a spreadsheet(s) to do some of the analyses in the book. I'm almost done with one that does the analysis in Chapter 6 example 1. Maybe we can share experience and thogught. I have a two-page errata sheet for...
  13. chichuck

    Spreadsheet for Seismic analysis

    adfo, An angineer by the name of Alex Tomanovich produces many excellent spreadsheets for structural calculations. Many are available at the AISC website SteelTools. http://www.steeltools.org/Home/ There is a recent posting there for one of Alex's spreadsheets that covers IBC 2009...
  14. chichuck

    ASCE7-05 Vs. ASCE7-10 Wind Loads

    All, Please see the attached xlsx file. I've calculated the wind loads for a site in midwestern USA, for all four Occupancy Categories, and compared final pressures in psf for both ASD and LRFD...
  15. chichuck

    FEMA 356 - Does Exist some design Handbook?

    ieronimoyuri, Here is a link to a webpage: http://www.wbdg.org/ccb/DHS/fema451.pdf Try this website for a pdf file of the fiollowing publication: NEHRP Recommended Provisions: Design Examples FEMA 451 - August 2006. This is a fairly comprehensive set of examples for applying the...
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