b=400; %mm
d=500; %mm
Asv = [3000 5000 3000 5000]; %mm^2
fckv = [30 30 90 90]; %Mpa
num_fckv = numel(fckv);
fsolve_opts = optimoptions('fsolve','Display','off');
c0 = 100;
tic
for k = 1:num_fckv
fck = fckv(k);
Ecshah=57000/145*(fck*145)^0.5; %Mpa
Es=200000; %Mpa
Esh=8500; %Mpa
fy=500; %Mpa
fsu=750; %Mpa
epssh=0.009;
epssu=0.075;
eps0=1.027*10^-7*fck*145+0.00195;
kshah=0.025*fck*10^3;
A=Ecshah*eps0/fck;
P=Esh*((epssu-epssh)/(fsu-fy));
epsy=fy/Es;
As = Asv(k);
%Values at yield
epssAtMy= epsy;
epscmAtMy=@(cAtMy) epssAtMy*cAtMy./(d-cAtMy);
funCshahAtMy=@(epsc) (1-(1-epsc./eps0).^A) .* (epsc<=eps0) + exp(-kshah*(epsc-eps0).^1.15) .* (epsc>eps0);
compressionAtMy=@(cAtMy) b*fck*cAtMy/epscmAtMy(cAtMy)*integral(funCshahAtMy,0,epscmAtMy(cAtMy))/1000;
%compressionAtMy=@(cAtMy) b*fck*cAtMy/epscmAtMy*integral(funCshahAtMy,0,epscmAtMy)/1000;
sigmaSteelAtMy= fy;
tensionAtMy= sigmaSteelAtMy*As/1000;
cAtMy(k)=fsolve(@(cAtMy) compressionAtMy(cAtMy)-tensionAtMy, c0, fsolve_opts)
c0=cAtMy(k);
funM=@(epsc) (1-(1-epsc./eps0).^A).*(d-cAtMy(k)+(cAtMy(k)./epscmAtMy(cAtMy(k))).*epsc) .* (epsc<=eps0) + exp(-kshah*(epsc-eps0).^1.15).*(d-cAtMy(k)+(cAtMy(k)./epscmAtMy(cAtMy(k))).*epsc) .* (epsc>eps0);
M(k)=b*fck*cAtMy(k)/epscmAtMy(cAtMy(k))*integral(funM,0,epscmAtMy(cAtMy(k)))/1000000
end
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