MAIN PROVISIONS OF PROTECTED CALCULATION FORTIFICTION STRUCTURES

Abstract

For assignment of the type and class of concrete and conditions of reinforcement the initial data must be given, which include: geometric parameters of the settlement wall or overlap of the fortification structure: the estimated flight is l0, m; height (width) Н, m; thickness h, m; parameters of the fire weapon, fire influence, which must withstand the protective cover: the speed of the approach of the ammunition to the protective thickness v_c, m / s; the mass of the munition, kg; projectile caliber d, mm; the height of the main part of the projectile Н_г, m.

To determine the thickness of the protective structures, the following data is required: - geometric parameters of the calculated wall or overlap of the fortification structure: estimated flight, l0, m, height
(width) Н, m,; parameters of the fire weapon, fire influence, which must withstand the protective cover: the speed of the approach of the ammunition to the protective thickness v_c, m/s; mass of ammunition m, kg; projectile caliber d, mm; height of the main part of the projectile Н_г, m; class and type of concrete, with given physical and mechanical characteristics; scheme and parameters of the planned reinforcement.

The influence of reinforcement on concrete strength is established. The influence of reinforcement on the strength of concrete should be taken into account in the presence of the following structural conditions: the area of the cross section of the rods per unit length in one and in other directions do not differ by more than 1,5 times; the distance between the rods of one direction does not exceed 150 mm, and do not exceed more than 1/3 of the smaller side of the cross section of the element.

The basic calculation dependences of the calculation of protective fortifications of the firearms effect are developed and established. The methodology of calculation of such types of protective structures is proposed.