initial commit / add all books

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diff --git a/3774/CH5/EX5.4/Ex5_4.sce b/3774/CH5/EX5.4/Ex5_4.sce
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+// exa 5.4 Pg 151
+clc;clear;close;
+
+// Given Data
+D=0.75;//m
+ps=1.55;// N/mm.sq
+eta_l=0.75;// efficiency
+sigma_t=90;// MPa
+sigma_c=140;// MPa
+tau=56;// MPa
+n=2;// no. of rivets
+
+printf('DESIGNING LONGITUDINAL JOINT - \n')
+printf('\n Plate Thickness')
+t = ps*D*1000/2/sigma_t/eta_l+1;// mm
+printf(', t = %.2f mm',t)
+t=ceil(t);//mm (adopted for design)
+printf('\n use t = %d mm',t)
+
+printf('\n Diameter of rivet hole, do = ')
+d0=6*sqrt(t);//mm (for t>8 mm)
+printf('%.2f mm',d0)
+d0=19.5;// suggested for design
+printf('\n Use do = %.1f mm',d0)
+printf('\n Diameter of rivet, d = ')
+d=d0-1.5;//mm 
+printf('%.2f mm',d)
+
+printf('\n Pitch of rivets, p = ')
+Ps=(2*1.875)*%pi/4*d0**2*tau;// N
+// Putting Pt=Ps where Pt=(p-d0)*t*sigma_t;// N
+Pt=Ps;//N
+p=Pt/(t*sigma_t)+d0;// N
+printf('%.2f mm',p)
+C=3.5;// for 2 no. of rivets
+pmax=C*t+40;// mm (as per IBR)
+printf('\n as per IBR-\n pitch, pmax = %.f mm',pmax)
+p=75;// mm (adopted for design)
+printf('\n Use p = %.f mm',p)
+
+//Distance between rows of rivets
+dis=0.33*p+0.67*d0;// mm 
+printf('\n distance between rows of rivets = %.1f mm',dis)
+dis=40;//mm (adopted for design)
+printf('\n take & use this distance = %.f mm', dis)
+
+printf('\n Thickness of butt strap, t= ')
+t1=0.625*t;// mm
+printf(' %.2f mm',t1)
+t1=7;// mm (adopted for design)
+printf('\n Use thickness = %.f mm',t1)
+
+//margin
+m=ceil(1.5*d0);// mm
+printf('\n margin, m = %.f mm',m)
+
+// Efficiency of joint
+Pt=(p-d0)*t*sigma_t;// N
+Ps=Ps;// N (shearing resistance of rivets)
+Pc=n*d0*t*sigma_c;// N (crushing resistance of rivets)
+sigma_com = (p-2*d0)*t*sigma_t+%pi/4*d0**2*tau;// N
+printf('\n strength of the joint = %d N',Pt)
+P=p*t*sigma_t;//N (strength of solid plate)
+printf('\n strength of solid plate = %d N',P)
+eta_l=Pt/P*100;// % (efficiency)
+printf('\n Efficiency of joint, eta_l = %.2f %% = 75 %% as given',eta_l)
+