Dear Clemens @karamba3d

As your request i open a new topic about the NB_RD values.

01_SimpleBeam_cp-Jac.gh (41.3 KB)

On this example i applied a unique point load who generate uniform compression along the beam

My result below :

I dont find the same NB_RD values as yours

As you, i find χ yy = 0.9144 and χ zz = 0.7204

But for Nb.rd i find :

N b.rd.yy = 0,9144 * (45.25cm2*10^-4) * (235MPa*10^6)/1000 ) / 1 (γM0) = 972 kN

N b.rd.zz = 0,7204 * (45.25cm2*10^-4) * (235MPa*10^6)/1000 ) / 1 (γM0) = 766 kN

When Karamba give me NB_RD = 1063 kN

I misunderstood something ?

Also, the Az values in cross section components was 9.69cm2, i find 14.47 cm2 (Avz = A - 2.btf + (tw+2.r)*tf)

Thanks for your help.

Regards

Jacques