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  1. civilsid

    quonset arch section properties

    A couple things- I spoke with a contractor friend last night and he explained that he has heard this same story many times. The company selling the buildings provides a low-ball number and then screws the buyer at every turn and the buyer has no choice but to pay it. Also, this is a...
  2. civilsid

    quonset arch section properties

    Yes, I am OK with the foundation / footing design. The building department wants the calcs on the building itself: "Two sets of plans and two sets of calculations for metal buildings shall be submitted, wet stamped by an engineer registered in Arizona". The part that annoys me is that the...
  3. civilsid

    quonset arch section properties

    I was approached by a client to design a foundation for his U.S. Buildings quonset hut shaped garage. Our local municipality requires structural calculations in addition to the plans. U.S. Buildings told me it would be an additional $2,000 for the calcs. Of course this is completely...
  4. civilsid

    Book recommendation on "beginning" residential structural engineering

    I totally understand where pspe is coming from. I also am a degreed mechanical engineer and have been working in Civil for the last 5 years. I have been concentrating in land development which has come to a grinding halt. As a private consultant, it is important for me to recognize my...
  5. civilsid

    best books for learning structural eng?

    Thanks to all- I actually started by asking around to see if any of my peers locally had any concrete resources and, unbelievably, absolutely nobody had any ACI stuff so I ordered the entire MCP 2008 which set me back several hundred dollars but is well worth it. I don't know what the other...
  6. civilsid

    best books for learning structural eng?

    I am a civil PE that happened to pass the CA Seismic exam but know very little about structural engineering- I took two semesters of statics way back in college. I have been getting multiple calls for designing simple structures such as single floor steel frame buildings, garages, carports...
  7. civilsid

    derivation of CN's?

    I am working on a residential subdivision approx. 100 acres in size and all lots are going to one acre or larger. I am using TR-55 to develop my Q's and notice that the CN for residential districts one acre in size or larger is CN = 68; all soils are Type "B" for this application. Many...
  8. civilsid

    ASTM 5921 supporting material

    I am using the ASTM 5921 "Standard Practice for Subsurface Site Characterization of Test Pits for On-Site Septic Systems". I think I am doing a reasonable job of flailing through the soil characterization process but I would like to get some feed back from the engineering community regarding...
  9. civilsid

    need info for Hamilton Dial-A-Torque and Mutoh drafting machine

    I just purchased a used drafting table which is called dial-a-torque and is made by Hamilton Industries. It has a Mutoh drafting head and I would like to get everything working right. I have the table working correctly as far as the legs up and down and table rotating forward and back. I took...
  10. civilsid

    BOD aging vs. SRT?

    Is there a direct relationship between what is commonly known as "Solids Retention Time" (the age of the suspended solids) and the BOD sludge age? I had some calculations go very awry because I used the age of the BOD and not the SRT. If they are not the same, what gives?
  11. civilsid

    Looking for Information

    Please look at this site: http://norweco.com/html/products/singulair.htm I work with an engineer that uses these systems extensively in AZ. Please shoot me a response if there is more I can do to help.
  12. civilsid

    inground swimming pool inquiry

    I am in NW Arizona and remember working for an engineer several years ago and we got a few calls from home owners that had inground swimming pools begin to float on them, obviously from the build up of hydrostatic pressure. I have never heard of this happening back east (western NY) where the...
  13. civilsid

    Can anyone explain Schultz-Hardy rule?

    Civil P.E. study question I ran into but would like someone experienced to translate this into English. It is somewhat confusing to me: If 0.1 mol/L of sodium is sufficient to destabilize a colloid, then which of the following doses will be equally effective? 1.00× 10 ?4 mol/L of alum...
  14. civilsid

    Referencing (Xref)

    That sounds sort of confusing but I think I know what you are getting at. XREF's can be "chained" which can be helpful but can also be confusing. If your SITE dwg has a xref to the TOPO dwg (that is you open SITE and xref in TOPO) and then save SITE with the external reference. Now, you open...
  15. civilsid

    Speed Limits - General Question

    While traffic engineering is not my typical bag, I would like to say that I travel I-40 in AZ for about 20 miles on most days. The speed limit along this stretch is 75 mph. I try to leave myself plenty of time so that I can go a few miles per hour slower in the name of better fuel economy...
  16. civilsid

    Another Text Height in Paper Space

    I gotta vote "NO WAY" to objects in model space and text in paper space. A couple reasons: 1. Biggest reason of all- You can be in model space and have no idea what is in paper space. They need to share the same "space" so you get the look / fit / feel right. I know you can work in MS...
  17. civilsid

    Another Text Height in Paper Space

    1. Use labels. Labels in model space always show up the same size in paper space. To test this, make a label in model space, create a viewport in paperspace, and you will notice that as you scale in and out in the VP, the label text changes size. When yout hit REGEN, it redraws to the...
  18. civilsid

    Traffic Impact Testing on Fire Hydrants

    This sounds like mixed up communication somewhere. To the best of my knowledge, fire hydrants don't move an, unless placed in a lane of traffic, should not in any way impact traffic patterns. (And who said engineers don't hjave a sense of humor!) In reality, if someone were to actually hit or...
  19. civilsid

    Translucent Images

    I am using Civil 3D 2007 and this is what I do: Load whatever multiple images you need and scale them in appropriately. Highlight images (individually or in combination) and rt click for shortcut menu. In the shortcut menu, you can select transparency from a submenu then select on or off...
  20. civilsid

    Using "Peck's Method" for design pressure

    Thanks for the many replies. Here is the actual question: A braced excavation is cut 12 ft deep in a clay with a unit weight of 125 lbf/ft3 and a cohesion of 3000 lbf/ft2. Using Peck’s method, the maximum design pressure is most nearly... I guess that is a good point to note from...

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