Open the attached project in SAP2000 and run the geometrically nonlinear analysis (GNA)(1) to get results. This type of analysis is predefined in SAP2000 due to the fact that the buckling lengths are not defined in the Member application and additional internal forces from the global imperfection ought to be covered in this analysis.
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Next thing is to set correct boundary conditions. To all related members are assigned the hinges where all three degrees of freedom (X, Y, Z) are set as a default. The settings of the boundary conditions ought to respect the FEM in SAP2000. For Member 1 restrain the rotation Ry at the beginning and release the translation X, Z at the end of the member. 2ff7e9595c
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