//(Welded and Riveted Joints) Example 8.21
//Refer Fig.8.61 on page 310
//Width of the plate w (mm)
w = 250
//Thickness of the plate t (mm)
t = 20
//Permissible tensile stress in the plate and rivet sigmat (N/mm2)
sigmat = 80
//Permissible compressive stress in the plate and rivet sigmac (N/mm2)
sigmac = 120
//Permissible shear stress in the plate and rivet tau (N/mm2)
tau = 60