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  1. Johnny pap

    joist model instabilty in Risa 3D

    I have a standard OWJ between 2 beams.Risa shows instability in the bottom chord. I have Lyy=1200mm (48in) for the top chord, Lbzz=3000mm (10 ft). For the bottom chord I've input Lbyy=3000mm and Lbzz=3000mm Boundary (both ends): Rx - Reaction Ry - Reaction Rz - Fixed Mx - fixed My - fixed Mz -...
  2. Johnny pap

    i get instabilities in my very simple RISA 3D model. Need help. URGENT

    Josh, Thanks a lot. You save my day and much more then this.
  3. Johnny pap

    i get instabilities in my very simple RISA 3D model. Need help. URGENT

    SORRY ABOUT THIS... File attached now.https://files.engineering.com/getfile.aspx?folder=c62e780c-44d8-42c5-922a-20fe72b6ba98&file=3132_RISA_Stair_Upper_Rev_0.r3d
  4. Johnny pap

    i get instabilities in my very simple RISA 3D model. Need help. URGENT

    I attached my RISA file. I am not new in Rise, I checked all basic stuff, pin-pin, joint coordinates - everything seems great. There are twu parallel beams with everything the same, and errors on only one of them
  5. Johnny pap

    i get instabilities in my very simple RISA 3D model. Need help. URGENT

    No pin-pin problem. I checked everything I could. I am looking for someone who can review my model and help resolve the problem.

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