initial commit / add all books

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+// exa 5.2 Pg 147
+clc;clear;close;
+
+// Given Data
+w=400;//mm
+t=20;//mm
+sigma_t=90;// MPa
+tau=60;// MPa
+sigma_c=140;// MPa
+
+printf('\n Diameter of rivet, do = ')
+d0=6*sqrt(t);//mm (for t>8 mm)
+printf('%.2f mm',d0)
+d0=29;//mm (standard)
+printf('\n Standard diameter of rivet hole, do = %.f mm & corresponding diameter of rivet = 27 mm',d0)
+Pt=(w-d0)*t*sigma_t;//N max. tearing strength of plate
+Ps=1.75*%pi/4*d0**2*tau;// N (shearing strength of one rivet)
+n1=Pt/Ps;// no. of rivets
+n=ceil(n1);
+printf('\n no. of rivets, n = %.3f. Use n = %.f ',n1,n)
+t1=0.75*t;// mm
+t2=t1;// mm
+printf('\n thickness of inner butt strap, t1 = %.f mm', t1)
+printf('\n thickness of outer butt strap, t2 = %.f mm', t2)
+// section 1-1 
+P1=(w-d0)*t*sigma_t;//N
+// section 2-2 
+P2=(w-2*d0)*t*sigma_t+1.75*%pi/4*d0**2*tau;//N
+// section 3-3 
+P3=(w-3*d0)*t*sigma_t+1.75*3*%pi/4*d0**2*tau;//N
+// section 4-4
+P4=(w-4*d0)*t*sigma_t+1.75*6*%pi/4*d0**2*tau;//N
+Ps=10*Ps;// N (shearing stress of all rivets)
+Pc=10*d0*t*sigma_c;// N (shearing stress of all rivets)
+Pj=P1;// N (strength f joint)
+P = w*t*sigma_t;// N (strength of solid plate)
+eta=P1/P*100; // % (efficiency of joint)
+printf('\n efficiency of joint = %.2f %%', eta)
+p1=3*d0+5;// mm (pitch of rivets)
+p=100;//mm (adopt for design)
+printf('\n pitch of rivets = %.f mm. Use %.f mm',p1,p)
+m1=1.5*d0;// mm (margin)
+m=50;//mm
+w=3*p+2*m;// mm
+printf('\n margin,\n m = %.1f mm. Use %.f mm', m1,m)
+printf('\n w = %.f mm',w)
+dis=2.5*d0;// mm
+printf('\n distance between rows = %.1f mm. Use 75 mm',dis)