Hi , I am confused about design parameters used for steel structure like Ly,Lx,Lz and Kx,Ky,Kz. why should they use and what will happen if they are not used?
Please check this Forum thread for an answer: https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/144831/lx-ly-and-lz-explain-in-portal-frame-design
NOT CLEARED MY WHOLE DOUBT.PLZ EXPLAIN IN BRIEF.
not get reply yet from your side.
Assume the local x axis of member is along the length, Z is the major axis and y is the minor axis of the member. Then Lx is the unsupported length for lateral torsional buckling, Lz is the unsupported length for major axis bending and Ly is the unsupported length for minor axis bending. K is a coefficient whose value depends on end conditions of member. K*L is the effective length of member used in design. You can get the values of K in some standard books or codes.
In staad member length is considered as node to node distance by default. If there are additional nodes in a member then you need to assign Lx,Ly,:Lz for making staad understand the lengths to be used for design. Otherwise node to node distance will be used to calculate kl/r values.
Answer Verified By: SHUBHANGI JAGTAP
thanks sir