What % is the Maximum area of tension reinforcement in Beam?

We don't have the SI code but we can follow

p(min)=200/fy where fy is the yield stress of the reinforcing in psi. Since present rebar is metric and

normal bar is300 Mp =40Ksi, pm =0.5%

Hi grade Bar is420 Mp =60 Ksi pm =0.333%

High strength bar520 Mp =75 Ksi pm =0.25 %

rbar ratio (1-2)% in the beam

That depends, if you don't use rebar at the pressure side it is limited, it also depends on the regulations and how the bilinear figure of the concrete is defined.:

This is for rebar Feb500 (B500B) according to Eurocode:

w0;max = maximum rebar percentage = ¾*0,535*f’b/(0,01*435) =0,0922*f’b

with f’b is0,6 X concrete strength.

But again: it depends on the local regulations

I also go with Mr. Wolf Klass Kinsbergen's, Mr. Alex Al Yazouri and Mr. Jocob Alomer's answers.

There answers are very nice explained  

Thank you for invitation ...

I'm with answer of Eng.Wolf Klaas Kinsbergen

Endorse Expert's answer !!

Agree with Mr. Alex