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  1. EngineerDavid

    Fatigue Category for built up crane girder

    In appendix 3 "Design for Fatigue" in ANSI/AISC 360-10 which I find in the 14th edition steel manual, Table A-3.1 (starting on page 16.1-198) has only one section for connected material in mechanically fastened joints. In this section 2, what would be the Cf constant or the stress category...
  2. EngineerDavid

    Large structural frame that has permanet deflections. How to repair?

    Thank you. The straightening is required by the final customer and will be needed for the operation of the chamber. I agree that the heat straightening is the only way to proceed but it will be a difficult process since the structure is so large. My next step is to check with contractors who...
  3. EngineerDavid

    Large structural frame that has permanet deflections. How to repair?

    There is not a specific volume required. It just must be large enough to enclose the equipment required to be inside.
  4. EngineerDavid

    Large structural frame that has permanet deflections. How to repair?

    No, it was a pressure testing situation for a new chamber and the pressure that developed inside exceeded the design values due to an error by an operator. The chamber platework bulged and then welds broke which relieved the overpressure but not before there was permanent deformation. I assume...
  5. EngineerDavid

    Large structural frame that has permanet deflections. How to repair?

    I am looking at a large steel frame with an internal plated chamber supported by the steel framework. The rectangular chamber is about 100ft by 20 ft by 75 ft high. There was an overpressure that has caused the plates and the structure to permanently deform. The customer wants to fix rather...

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