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What is the difference between LW and LT in Window 1.5 "Effective Lengths - Members" and Window 1.6 "Effective Lengths - Set of Members?"

Answer

The length LT represents the buckling length for torsional buckling and lateral-torsional buckling under the systematic centric pressure. The length LT works similarly to Column D and Column G: a critical and buckling load is calculated for the design of a pure compressive force according to EN 1993‑1‑1, Section 6.3.1.4.

On the other hand, the length LW is not the effective length, but the length to which the moment and shear force distribution is related with the boundary conditions kz and kw (Columns J and K) as well as the lateral intermediate supports. This length should usually not be changed.

Keywords

Effective length Buckling length Lateral-torsional buckling Stability Stability analysis LW LT

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