I how can I process this loop problem

This is my first time of using tyhis question segment

I need assistance, I need to generate some data.

the first step is to compute a parameter

t_1 = Pd*di/(2*k*Fy); %Initial guess of t

Do = di + 2*t_1

using criteria if

t_1/Do < 0.05;

then t_1 = tmin however if its not we proceed to using

the next equation which is different from the first

t_1 = (Pd-Po)*Do/2*k*Fy;

and the same criteria is check.

t_1/Do<0.05

then t_1 = tmin however if its not we proceed to using

the next equation which is different from the first and second

t_1 = D/(4*Fy)/((Ysc*Ym*(Pli-Pe)*sqrt(3)) + 1;

and the same criteria is check.

t_1/Do<0.05

After which the process will be restarted