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  • Users: umgrego2
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  1. umgrego2

    Length of Time Required to Store Calculation Records

    How long do you need to keep your calculations in storage? Is there a point after a certain number of years that you can start pitching stuff in the garbage? Our administration is looking at reducing the cost of storing drawings and engineering calculations. Is seven years reasonable? 20...
  2. umgrego2

    Concrete rebar placement factor

    In the Canadian concrete code, there is a modification factor for the development length that is dependent on whether or not the rebar is "top" tension steel or "bottom" tension steel. I understand how to differentiate between the two, but what is the reason for this...
  3. umgrego2

    Single bolt connections in steel frames

    There has been a lot of discussion at our office over the use of single bolt connections in steel frames that we design. The two more experienced people feel quite strongly that you should not design a bolted connection that uses only one bolt. One claims that it is an erection safety issue. The...
  4. umgrego2

    Minimum size of principal rebar in concrete

    One of the more experienced engineers at our firm has made the comment that you shouldn't use 10M bar as the principal reinforcement in concrete. He maintains that 10M should only be used as ties and stirrups. The problem is, that it doesn't say this in the concrete code. Has anyone heard this...
  5. umgrego2

    Modelling thermal expansion

    I've modelled a stainless 12 ga SS304 duct for a kiln where the temperature goes between ambient room and 120 degrees C. Currently, the duct is proposed to be built with fixed ends. In my RISA model, I end up with 44 kips/ft force along the perimeter of the ends of the duct. The numbers...

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