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+// Problem 5.13,Page no.135
+
+clc;clear;
+close;
+
+d=10 //cm //distance between joists
+t=2 //cm //thickness of steel plate 
+d_2=20 //cm //depth of beam
+sigma_t=8.5 //N/mm**2 //stress in timber 
+E_s=2*10**5 //N/mm**2 //Modulus of elasticity of steel
+E_t=10**4 //N/mm**2 ////Modulus of elasticity of timber
+L=5 //cm //span of beam
+
+//calculation
+sigma=10*15**-1*sigma_t //stress in timber at distance of 10 cm from XX (N/mm**2)
+
+dell=sigma*E_t**-1 //strain in timber at 10 cm from XX (N/mm**2)
+
+sigma_s=dell*E_s //N/mm**2 //Max stress
+
+//For Timber
+Z_w=1*6**-1*10*30**2*2 //cm**3 //section modulus of timber
+M_w=sigma_t*100*Z_w //moment of resistance of timber (N-cm)
+
+//For steel
+Z_s=1*6**-1*2*20**2 //cm**3 //section modulus of steel
+M_s=sigma_s*Z_s*100  //moment of resistance of steel (N-cm)
+
+M=(M_w+M_s)*10**-5 //total moment of resistance(N-cm)
+
+//M=w*L**2*8**-1 //N*cm //Max bending moment
+w=8*M*(L**2)**-1 //kN/m //Max uniform distributed Load
+
+//Result kN/m
+printf("Moment of resistance is %.3f N-cm",M)
+printf("\n Max uniform distributed Load = %.3f kN/m",w)
+// answer in the textbook is not accurate.
+
+
+