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+b=250//width, in mm
+D=450//depth, in mm
+c=50//cover, in mm
+Asc=1472//in sq mm
+Ast=Asc
+fck=15//in MPa
+fcc=0.446*fck//in MPa
+fy=250//in MPa
+Es=2*10^5//in MPa
+ey=0.87*fy/Es//strain in mild steel at yield point
+fs=0.87*fy//stress in mild steel at yield point, in MPa
+
+//xu=infinity
+Pu1=(0.446*fck*(b*D-Asc-Ast)+(Asc+Ast)*fs)/10^3//in kN
+Mu1=0//in kN-m
+
+//xu=1.5 D
+xu=1.5*D//in mm
+m=0.43*D//in mm
+esc1=0.002*(xu-c)/(xu-m)
+if(esc1<=ey)
+ fsc1=esc1/ey*fs
+else
+ fsc1=fs
+end
+esc2=0.002*(xu-D+c)/(xu-m)//>ey
+if(esc2<=ey)
+ fsc2=esc2/ey*fs
+else
+ fsc2=fs
+end
+//stress block parameters for xu / D = 1.5
+n=0.422
+l=0.48
+A=n*fck*D//area of stress block
+r=l*D//distance of c.g.
+Pu2=(A*b+Asc*fsc1+Ast*fsc2)/10^3//in kN
+Mu2=(A*b*(D/2-r)+Asc*fsc1*(D/2-c)-Ast*fsc2*(D/2-c))/10^6//in kN-m
+
+//xu=1.3 D
+xu=1.3*D//in mm
+m=0.43*D//in mm
+esc1=0.002*(xu-c)/(xu-m)
+if(esc1<=ey)
+ fsc1=esc1/ey*fs
+else
+ fsc1=fs
+end
+esc2=0.002*(xu-D+c)/(xu-m)//>ey
+if(esc2<=ey)
+ fsc2=esc2/ey*fs
+else
+ fsc2=fs
+end
+//stress block parameters for xu / D = 1.3
+n=0.409
+l=0.468
+A=n*fck*D//area of stress block
+r=l*D//distance of c.g.
+Pu3=(A*b+Asc*fsc1+Ast*fsc2)/10^3//in kN
+Mu3=(A*b*(D/2-r)+Asc*fsc1*(D/2-c)-Ast*fsc2*(D/2-c))/10^6//in kN-m
+
+//xu=1.2 D
+xu=1.2*D//in mm
+m=0.43*D//in mm
+esc1=0.002*(xu-c)/(xu-m)
+if(esc1<=ey)
+ fsc1=esc1/ey*fs
+else
+ fsc1=fs
+end
+esc2=0.002*(xu-D+c)/(xu-m)//>ey
+if(esc2<=ey)
+ fsc2=esc2/ey*fs
+else
+ fsc2=fs
+end
+//stress block parameters for xu / D = 1.2
+n=0.399
+l=0.458
+A=n*fck*D//area of stress block
+r=l*D//distance of c.g.
+Pu4=(A*b+Asc*fsc1+Ast*fsc2)/10^3//in kN
+Mu4=(A*b*(D/2-r)+Asc*fsc1*(D/2-c)-Ast*fsc2*(D/2-c))/10^6//in kN-m
+
+//xu=1.1 D
+xu=1.1*D//in mm
+m=0.43*D//in mm
+esc1=0.002*(xu-c)/(xu-m)
+if(esc1<=ey)
+ fsc1=esc1/ey*fs
+else
+ fsc1=fs
+end
+esc2=0.002*(xu-D+c)/(xu-m)//>ey
+if(esc2<=ey)
+ fsc2=esc2/ey*fs
+else
+ fsc2=fs
+end
+//stress block parameters for xu / D = 1.1
+n=0.384
+l=0.443
+A=n*fck*D//area of stress block
+r=l*D//distance of c.g.
+Pu5=(A*b+Asc*fsc1+Ast*fsc2)/10^3//in kN
+Mu5=(A*b*(D/2-r)+Asc*fsc1*(D/2-c)-Ast*fsc2*(D/2-c))/10^6//in kN-m
+
+//xu = D
+xu=D//in mm
+m=0.43*D//in mm
+esc1=0.002*(xu-c)/(xu-m)
+if(esc1<=ey)
+ fsc1=esc1/ey*fs
+else
+ fsc1=fs
+end
+esc2=0.002*(xu-D+c)/(xu-m)//>ey
+if(esc2<=ey)
+ fsc2=esc2/ey*fs
+else
+ fsc2=fs
+end
+//stress block parameters for xu / D = 1
+n=0.361
+l=0.416
+A=n*fck*D//area of stress block
+r=l*D//distance of c.g.
+Pu6=(A*b+Asc*fsc1+Ast*fsc2)/10^3//in kN
+Mu6=(A*b*(D/2-r)+Asc*fsc1*(D/2-c)-Ast*fsc2*(D/2-c))/10^6//in kN-m
+
+//xu=400 mm
+xu=400//in mm
+esc=0.0035*(xu-c)/xu
+if(esc<=ey)
+ fsc=esc/ey*fs
+else
+ fsc=fs
+end
+est=0.0035*(D-xu-c)/xu
+if(est<=ey)
+ fst=est/ey*fs
+else
+ fst=fs
+end
+Pu7=(0.36*fck*b*xu+Asc*fsc-Ast*fst)/10^3
+Mu7=(0.36*fck*b*xu*(D/2-0.416*xu)+Asc*fsc*(D/2-c)+Ast*fst*(D/2-c))/10^6
+
+//xu=375 mm
+xu=375//in mm
+esc=0.0035*(xu-c)/xu
+if(esc<=ey)
+ fsc=esc/ey*fs
+else
+ fsc=fs
+end
+est=0.0035*(D-xu-c)/xu
+if(est<=ey)
+ fst=est/ey*fs
+else
+ fst=fs
+end
+Pu8=(0.36*fck*b*xu+Asc*fsc-Ast*fst)/10^3
+Mu8=(0.36*fck*b*xu*(D/2-0.416*xu)+Asc*fsc*(D/2-c)+Ast*fst*(D/2-c))/10^6
+
+//xu=350 mm
+xu=350//in mm
+esc=0.0035*(xu-c)/xu
+if(esc<=ey)
+ fsc=esc/ey*fs
+else
+ fsc=fs
+end
+est=0.0035*(D-xu-c)/xu
+if(est<=ey)
+ fst=est/ey*fs
+else
+ fst=fs
+end
+Pu9=(0.36*fck*b*xu+Asc*fsc-Ast*fst)/10^3
+Mu9=(0.36*fck*b*xu*(D/2-0.416*xu)+Asc*fsc*(D/2-c)+Ast*fst*(D/2-c))/10^6
+
+//xu=325 mm
+xu=325//in mm
+esc=0.0035*(xu-c)/xu
+if(esc<=ey)
+ fsc=esc/ey*fs
+else
+ fsc=fs
+end
+est=0.0035*(D-xu-c)/xu
+if(est<=ey)
+ fst=est/ey*fs
+else
+ fst=fs
+end
+Pu10=(0.36*fck*b*xu+Asc*fsc-Ast*fst)/10^3
+Mu10=(0.36*fck*b*xu*(D/2-0.416*xu)+Asc*fsc*(D/2-c)+Ast*fst*(D/2-c))/10^6
+
+//xu=300 mm
+xu=300//in mm
+esc=0.0035*(xu-c)/xu
+if(esc<=ey)
+ fsc=esc/ey*fs
+else
+ fsc=fs
+end
+est=0.0035*(D-xu-c)/xu
+if(est<=ey)
+ fst=est/ey*fs
+else
+ fst=fs
+end
+Pu11=(0.36*fck*b*xu+Asc*fsc-Ast*fst)/10^3
+Mu11=(0.36*fck*b*xu*(D/2-0.416*xu)+Asc*fsc*(D/2-c)+Ast*fst*(D/2-c))/10^6
+
+//xu=275 mm
+xu=275//in mm
+esc=0.0035*(xu-c)/xu
+if(esc<=ey)
+ fsc=esc/ey*fs
+else
+ fsc=fs
+end
+est=0.0035*(D-xu-c)/xu
+if(est<=ey)
+ fst=est/ey*fs
+else
+ fst=fs
+end
+Pu12=(0.36*fck*b*xu+Asc*fsc-Ast*fst)/10^3
+Mu12=(0.36*fck*b*xu*(D/2-0.416*xu)+Asc*fsc*(D/2-c)+Ast*fst*(D/2-c))/10^6
+
+//xu=250 mm
+xu=250//in mm
+esc=0.0035*(xu-c)/xu
+if(esc<=ey)
+ fsc=esc/ey*fs
+else
+ fsc=fs
+end
+est=0.0035*(D-xu-c)/xu
+if(est<=ey)
+ fst=est/ey*fs
+else
+ fst=fs
+end
+Pu13=(0.36*fck*b*xu+Asc*fsc-Ast*fst)/10^3
+Mu13=(0.36*fck*b*xu*(D/2-0.416*xu)+Asc*fsc*(D/2-c)+Ast*fst*(D/2-c))/10^6
+
+//xu=225 mm
+xu=225//in mm
+esc=0.0035*(xu-c)/xu
+if(esc<=ey)
+ fsc=esc/ey*fs
+else
+ fsc=fs
+end
+est=0.0035*(D-xu-c)/xu
+if(est<=ey)
+ fst=est/ey*fs
+else
+ fst=fs
+end
+Pu14=(0.36*fck*b*xu+Asc*fsc-Ast*fst)/10^3
+Mu14=(0.36*fck*b*xu*(D/2-0.416*xu)+Asc*fsc*(D/2-c)+Ast*fst*(D/2-c))/10^6
+
+//xu=200 mm
+xu=200//in mm
+esc=0.0035*(xu-c)/xu
+if(esc<=ey)
+ fsc=esc/ey*fs
+else
+ fsc=fs
+end
+est=0.0035*(D-xu-c)/xu
+if(est<=ey)
+ fst=est/ey*fs
+else
+ fst=fs
+end
+Pu15=(0.36*fck*b*xu+Asc*fsc-Ast*fst)/10^3
+Mu15=(0.36*fck*b*xu*(D/2-0.416*xu)+Asc*fsc*(D/2-c)+Ast*fst*(D/2-c))/10^6
+
+//xu=150 mm
+xu=150//in mm
+esc=0.0035*(xu-c)/xu
+if(esc<=ey)
+ fsc=esc/ey*fs
+else
+ fsc=fs
+end
+est=0.0035*(D-xu-c)/xu
+if(est<=ey)
+ fst=est/ey*fs
+else
+ fst=fs
+end
+Pu16=(0.36*fck*b*xu+Asc*fsc-Ast*fst)/10^3
+Mu16=(0.36*fck*b*xu*(D/2-0.416*xu)+Asc*fsc*(D/2-c)+Ast*fst*(D/2-c))/10^6
+
+//xu=100 mm
+xu=100//in mm
+esc=0.0035*(xu-c)/xu
+if(esc<=ey)
+ fsc=esc/ey*fs
+else
+ fsc=fs
+end
+est=0.0035*(D-xu-c)/xu
+if(est<=ey)
+ fst=est/ey*fs
+else
+ fst=fs
+end
+Pu17=(0.36*fck*b*xu+Asc*fsc-Ast*fst)/10^3
+Mu17=(0.36*fck*b*xu*(D/2-0.416*xu)+Asc*fsc*(D/2-c)+Ast*fst*(D/2-c))/10^6
+
+//xu=0.531 d
+d=D-c
+xu=0.531*d
+Pu18=0//in kN
+Mu18=0.149*fck*b*d^2/10^6//in kN-m
+
+Pu=[Pu1 Pu2 Pu3 Pu4 Pu5 Pu6 Pu7 Pu8 Pu9 Pu10 Pu11 Pu12 Pu13 Pu14 Pu15 Pu16 Pu17 Pu18]
+Mu=[Mu1 Mu2 Mu3 Mu4 Mu5 Mu6 Mu7 Mu8 Mu9 Mu10 Mu11 Mu12 Mu13 Mu14 Mu15 Mu16 Mu17 Mu18]
+xtitle('P-M Interaction Diagram', 'Mu (kN-m)', 'Pu (kN)')
+plot(Mu,Pu)
generated by cgit (git 2.34.1) at 2024-12-19 18:00:40 +0000