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Recent content by tkhartle

  1. tkhartle

    out of plane seismic forces in diaphragm or subdiaphragms

    haynewp, thanks for your suggestion of calling the deck manufacturer for compressive axial load. I will do that. I have heard of the suggestion of putting the angles as a horizontal truss as well. I am hoping the deck will take it. thanks everyone for your input.
  2. tkhartle

    out of plane seismic forces in diaphragm or subdiaphragms

    it is supported on joists and joist girders
  3. tkhartle

    out of plane seismic forces in diaphragm or subdiaphragms

    It is a roof deck, no concrete topping. It has tilt-up shear walls. I am using the edge angle for the chord members for the main diaphragm and the building is a box so no collector members are needed. I am interested in the out-of-plane forces in the deck. I understand that these forces...
  4. tkhartle

    out of plane seismic forces in diaphragm or subdiaphragms

    How do I figure out if a flexible metal deck can handle the compressive out of plane forces needed seismic design, parallel to the direction of the deck span. I have a building assigned to design category C. The force is calculated from 12.11.2.1 ASCE 7-05. I would like to use the deck as...
  5. tkhartle

    ponding, length of a cantilevered member for Cp calc

    I have an existing building with a spliced beam system supporting joists and metal deck. The bays are 40'x40'. The roof slope is 3/16" per foot. I am checking for ponding instability. The formula for Cp in AISC is Cp=32xLsxLp^4/10^7xIe. The splices are 5'6". For the beams that cantilever...
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