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Framework 5-52 SESAM 20-DEC-2007 Program version 3.5 ASSIGN STABILITY sel-mem BUCKLING-LENGTH AUTOMATIC ... sel-mem BUCKLING-LENGTH LATERAL-SUPPORT-AUTO LENGTH-BETWEEN-JOINTS MANUAL Ly Lz PURPOSE: To assign the buckling length of one or more members for buckling about the local y- and z-axes (in the local z-x- and x-y-planes). PARAMETERS: sel-mem Members to be assigned buckling lengths. For valid alternatives see command SELECT MEMBERS. AUTOMATIC Perform an automatic buckling length calculation of tubular members in NORSOK and API member and stability code checks. LATERAL-SUPPORT-AUTO Perform an automatic buckling length calculation of tubular members in NORSOK and API member and stability code checks with lateral spring stiffness at start and end of member set to 1.0. LENGTH-BETWEEN-JOINTS The length between joints shall be used for the computation of both buckling lengths. MANUAL Buckling lengths shall be user specified. Ly Buckling length for buckling in the member’s local x-z plane. Lz Buckling length for buckling in the member’s local x-y plane. NOTES: By default the buckling length of each member is computed as its length between joints. The automatic buckling length option calculates buckling factors for each element which is part of the member. In the code check the critical axial capacity is calculated for each code check position using the buckling factors for the element corresponding to the check position. The effective length factors which by default are set to 1.0 for both y and z-axes are not used for members with the automatic calculation activated. One exception is if the automatic buckling calculation fails. The buckling length will then be equal to the member length multiplied with the manually given effective length factors.
