The bolt group force analysis of rectangular explosion-proof tank shows the force is not uniform and the loading curve is inverted Vshape while the layout is uniform. To improve the connection security of the bolt group of explosion-proof tank,a method for layout optimization of bolt group is proposed. Based on the principle that the bolt layout density is proportional to strain values of the joint,force on the bolt group is simulated after analyzing the bolt spacing and the axial force. And then the bolt s...