Question

structural design / lateral-torsional buckling conceptual question
If Lb is greater than Lp and smaller than Lr , which option is true ?
1-Mn will be > Mp and Mr
2-Mn will be < Mp and Mr
3-Mn is equal to = Mp and Mr

someone had this question in his exam , and i transelate it to question by myself , so if there is any mistake , please correct it , thanks

Answer 1

If Le (abraced nl) but smaller then or equal to Ly the beading streng beam is based on "inelastic Lateral-torsionㅘ bncelina CTB ration aboauk anis Nominal flexural strengt diagran 2. s: 흙의" G - shaon modulus (1, 200ksi) Fyf: yield strees of finge (ksi)

Crress-saciosl area (in 3Tovsional const anl (int) Is in