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Recent content by Philboyd

  1. Philboyd

    horizontal deflection of scissor joist spported on masonry wall

    jrisebo, 12" CMU. 1900 psi, Type S mortar, f'm 1500 psi, #7 @ 48 vertical reinforcing, 4" brick veneer, 1'-6" total wall thickness. There is no way that I know of, besides buttresses, that the wall can be designed to resist the forces, so I must allow for the deflection, because if the roof...
  2. Philboyd

    horizontal deflection of scissor joist spported on masonry wall

    Steve, Thanks for the advice, I am inclined to argree to with you, but the designer in question has done the same type of design in the recent past and since they haven't experienced any cracking yet, they don't see any reason to change the design. I'm wondering if cracking that is due to...
  3. Philboyd

    horizontal deflection of scissor joist spported on masonry wall

    All, Thank you for your responses, they are appreciated. Just to clarify, the joists will be 60 inches deep and have parallel top and bottom chords,(both 2/12). The joists will be spaced at 10 to 12 feet and the thrust force causing the deflection will be approximately 82 kips horizontal, at...
  4. Philboyd

    horizontal deflection of scissor joist spported on masonry wall

    I am designing a gymnasium with load bearing masonry shear walls. the architect wants to use scissor joists with a 2-in-12 pitch for both the top and bottom chords. The joist span is 100 ft and the masonry bearng walls are approxomately 30 ft high to joist bearing. The joist manufacturer has...

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