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  • Users: PengStruct
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  1. PengStruct

    Braced Frame Conn. to Weak Col. with Offset

    Anyone ever pushed a braced frame off the column centerline like this before? See images below. I've looked at AISC design guide for brace connections and in the manual but don't see any mention of this scenario. The largest brace force is 30k in a 9 story structure. It seems that this would...
  2. PengStruct

    Use 1 Bent Instead of Whole Building For Stability Check per AISC DAM?

    When I run my model for a 4 story building with 5 moment frames the Pdelta and DAM takes an hour for the initial run. Does this sound like a normal run time? Is it acceptable to analyze 1 bent only for the stability check? All frames are the same.
  3. PengStruct

    R=3 Moment Frame Example with Current AISC methods?

    Can anyone point me to a good example for a low-mid rise steel moment frame design example? AISC steel design guide 5 is the most recent example I have found but it is dated 1991 with a second printing in 2003. I would like an example that follows a recent edition of AISC 360. Specifically I...
  4. PengStruct

    Steel or Concrete Moment Frames for Slender, Single-Bay Building

    I'm trying to determine the best type of lateral system for a 9 story apartment building only 17' wide x 60' long. Using a series of closely spaced steel moment frames (R=3) with a couple lines of braced frames seems to work well if I use cmu side walls and hefty concrete elements at the...
  5. PengStruct

    Who approves field changes, EOR or Staff Engineer?

    I'm inspecting some safety critical facade installations which the contractor has installed using a different type of epoxy than what is on the sealed shop drawings. As the Special Inspector I told them they needed to get the changes approved by the EOR but they only got an email statement from...
  6. PengStruct

    Potential Client is a Middle Man - Contract Questions

    I've been doing a little work with a guy who provides designs for temporary structures. He finds PEs like me to review and seal his work and do inspections. Now, one of his clients, another contractor who is doing a significant portion of work on a new building wants me to engineer shop...
  7. PengStruct

    Recommendation for 6' deep basement cut at edge of neighbors driveway?

    I'm a structures guy and my client, who's building a new house, has an approximately 16' long section of the house built 1' away from the property line and the neighbors driveway. He'll need to excavate at least 6' down to place the footing and I'm telling him he'll need to have shoring of some...
  8. PengStruct

    PE doing UT & MP Weld Testing

    Maybe I should post this in the inspectors forum but I think this is valid here too. I'm a structural PE with a small office offering design and inspections. I'm trying to market myself as a one stop shop for small projects where clients can get quality structural engineering complete with...
  9. PengStruct

    Small Office, Big Job

    An architect has a 3 story, 100,000ft2 school project with parking at the ground level with a 2nd floor pedestrian bridge connecting it to an existing building. I'm a one-man office and have been up and running for 1.5 years after working in design offices for 10 years with about 7 years of well...
  10. PengStruct

    Given a 1099, Should I Ask Them To Sign Contract?

    Dear wise people: I'm a new sole proprietor providing structural engineering and a local sign shop has agreed to my fees for several small projects. Basically I'll be designing/reviewing their shop drawings and stamping them. They are also asking for me to fill out a W9 form which I gather...
  11. PengStruct

    Generator Pad Design Questions

    Dear readers, I've been asked to provide a price for designing a foundation for a 5,000 lb emergency generator set which is to be installed on grade next to a apartment building with a 13.5' deep cellar. When I check the 12" thick concrete basement wall for the soil and surcharge (generator &...

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