Load-bearing calculation of HEB160

[hakjon]

Considering making a single stringer staircase from an HEB beam, but I've discovered that the torsional rigidity of an HEB beam isn't very good. A little unsure of how to calculate this, I've tried to outline some points.
sigma torsion=Mv/Wv but how does Mv work out?

 

[anaitis]

HE160B is more torsionally rigid than that.
A bit of a lever arm mistake there!
You should use L=450 mm.

 

[hakjon]

anaitis!
Is it really an "Mv" then, isn't it an "Mböj"? Please explain more, it's been a long time since I used the formula collection...

 

[anaitis]

Bending moment on the step plate, but torque against the beam.

But this is nothing you need to calculate. That beam is for your purpose to be considered as very stiff regarding twisting,

 

[hakjon]

Thanks bending moment no problem, I had drawn a heb120 first, but became unsure maybe heb 140 would be best in terms of strength and appearance, what do you think about this staircase? there will be a wall on one side of the staircase and probably triangular-like safety glass on the other side

 

[anaitis]

Looks stylish!

But you probably need protection between the insides of the steps, i.e., where the toes end up.
I don't think you can have it completely open.

 

[hakjon]

Thank you!
I will buy the steps from a snickeri that will also make a list there.