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Recent content by blackmaddog

  1. blackmaddog

    Slotted hole detailing dimensions

    AISC Table J3.3 specifies the standard dimensions of short and long slotted holes. Is the slot length measured out to out or center to center of the radius? We have one very old reference that shows both options. I don't have a AISC detailing manual to reference.
  2. blackmaddog

    NFPA 68 Pstat, Pred, and Pes relationships

    I am working on some venting projects for some baghouses and conveyors. We have a given vent test pressure (Pstat = 1.5psi). We need to determine the vent area and verify the enclosure strength is adequate. In reviewing the NFPA 68-2007 requirements for Pred and Pes, I have the following...
  3. blackmaddog

    Trailer Design Criteria

    The trailer is used to hall metal sheets and rounds over concrete and asphalt floors and driveways at speeds less than 10 MPH. Mike - When you say 1.5 to 2.0, do you mean reduce the AISC allowable load by 1.5 to 2.0? Would this then be an equivalent safety factor of 3 to 3.5?
  4. blackmaddog

    Trailer Design Criteria

    I am load rating an industrial trailer (ie not on highway) for a client. Does anyone have any references or suggested design criteria for trailer design? I have modeled the frame in RISA and multiple vertical loading combinations to determine what loads push it to AISC 13th allowable. I think...
  5. blackmaddog

    NCEES Record

    I have my NCEES record and use it regularly. It is a pain to get because you have to document all of your work history, get references, transcripts, etc. After you have it, you have to update and renew it yearly ($25). When you want to apply for another state, you fill out the information...
  6. blackmaddog

    Slenderness criteria for plate or bar element

    I sent the same question to AISC Solutions Center and received the following reply: Section B4.1 doesn’t apply to a solid bar or plate that is only supported at the ends, but not along the edges parallel to the load. The strength of the plate you’re describing would be determined by either...
  7. blackmaddog

    Slenderness criteria for plate or bar element

    If you have a solid rectangular plate or bar in compression, what slenderness criteria applies in section B4 of AISC 13th? Section B4.1 indicates that unstiffened elements are supported along only one edge parallel to the direction of the compression force. A bar in compression is not...
  8. blackmaddog

    Allowble Shear Stress on Fillet Weld for Seismic Loads

    None. Current code provisions do not allow increases in allowable stress for seismic or wind loads. In fact, many connections have to be designed to resist an amplified seismic load.
  9. blackmaddog

    Cold Form Zee Purlin Properties

    The Light Gage Structural Institute has lots of design information with capacity tables for common sections. http://www.loseke.com/lgsi.html
  10. blackmaddog

    Water freezing in HSS Column

    If the freezing action didn't split the HSS or permanently deform the shape, I would think it is okay. Prevent the water from getting inside or drain it to prevent future damage. I have seen ice split HSS before so detailing to prevent water intrusion is very important.
  11. blackmaddog

    Anchor bolts in Seismic Design Category D & requirements of ACI 318-05

    I assume you can't increase embedment or decrease diameter to meet the ductile steel requirement. If your base plate will yield at design loads, I would argue that the ductile requirement of D3.3.5 is met. Another option is to design reinforcement to resit the anchor loads with effective force...
  12. blackmaddog

    post tensioned concrete tank design references

    Do you know of any other references for wastewater applications?
  13. blackmaddog

    post tensioned concrete tank design references

    Who are some suppliers you are familiar with? In this case, I have a detailed design from a company in Germany but the design needs to be checked against US codes for local loads and permitting.
  14. blackmaddog

    post tensioned concrete tank design references

    I am looking for design references for post tensioned concrete tank design. The application is similar to wastewater exposure. If you have any suggestions, please post them.
  15. blackmaddog

    Wind Loads in Canada

    AISC
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