Dear,
Why is reported slenderness different in the report and the beam query?
Which STAAD.Pro version? Can you attach that model?
Version 22.00.00.015
STAAD SPACE INPUT WIDTH 79 UNIT METER KN JOINT COORDINATES 1 0 0 0; 2 8 0 0; MEMBER INCIDENCES 1 1 2; SUPPORTS 1 PINNED 2 FIXED BUT FX MY MZ DEFINE MATERIAL START ISOTROPIC STEEL E 2.05e+08 POISSON 0.3 DENSITY 76.8195 ALPHA 1.2e-05 DAMP 0.03 TYPE STEEL STRENGTH RY 1.5 RT 1.2 END DEFINE MATERIAL MEMBER PROPERTY EUROPEAN 1 TABLE LD L150X150X15 SP 0.015 CONSTANTS MATERIAL STEEL ALL LOAD 1 LOADTYPE None TITLE LOAD CASE 1 JOINT LOAD 2 FX -10 PERFORM ANALYSIS PRINT STATICS CHECK PARAMETER 1 CODE EN 1993-1-1:2005 SGR 2 ALL CHECK CODE ALL FINISH
I think in the Member query box a local slenderness lambda is reported which is being calculated as per cl. 4.7.9 and 4.7.10 of BS 5950.