The maximum tensile stress, f_vmax = f_c(0.98-0.825(y_po/y_o)) which is valid for y_po/y_o = 0.3 to 0.7 bursting tension, F_bst = pk(0.48-0.4(y_po/y_o)), (y_po/y_o) = ratio of sides of loaded area to bearing area of prism, f_v = transverse tensile stress, f_c = average compressive stress in prism, p_k = applied compressive force on end block.

When allowance is provided for tension taken by concrete, creating bursting tension is given by F_bst, corred = F_bst(3-(f_v/f_v,max)²), ft = permissible tensile strength of concrete.
To resist bursting tension, reinforcement should be arranged between 0.2y₀ and 2y₀ providing maximum intensity of stress.

In most post tensioned members, prestressing wires are introduced in cable holes or ducts, performed in members and n stressed and anchorage at end faces and as a result of this, large forces, concentrated over relatively small areas, are applied on end blocks.

Experimental investigation on concrete prismatic specimen was conducted by Zielinski and Rowe using technique of surface strain measurements if groups of anchorages are encountered end block is divided into a series of symmetrically loaded prisms and each prism is analyzed for bursting tensile forces using recommended Indian code provision expressions.

The tensile forces developed in transverse direction to axis of concentrated force are called as bursting forces; concept of symmetrical or equivalent prism for eccentric cables and method of partitioning for analysis of stresses developed due to multiple cables have been introduced by Guyon.

The highly discontinuous forces which are applied at end, while changing progressively to continuous linear distribution, develop transverse and shear stresses, ratio of transverse tensile stresses to average compressive stress gradually decreases with increase in ratio of depth of anchor plate to that of end block.

The zone between end of beam and section where only longitudinal stress exists is generally referred to as anchorage zone or end block, as a result of this, large forces, concentrated over relatively small areas are applied on end blocks, highly discontinuous which are applied at end while changing progressively to continuous linear distribution, develop transverse and shear stresses.

Generally, transmission length is taken as equal to depth of beam and bursting forces are considered in case of transmission length, when it is not possible to arrange end forces evenly, Guyon recommended that transverse tensile stresses be investigated along successive resultants, such as resultant of all forces, resultant of smaller groups of forces, lines of action of individual forces.

The main plate of member in anchorage zone has minimum edge of at least 1.5 times corresponding lateral dimension compressive stresses of anchorage devices, basic anchorage devices which satisfies below condition will have no additional check of compressive stresses of concrete f_b< 0.7?f?c_i(A/A_g).

The bursting tensile force in end blocks with proportion pi is given as:
F_bst = P_i(0.32-0.3(y_po/y_o)), y_po/y_o < or equal 0.3, F_bsr/P_i = 0.23,
y_po/y_o > or equal 0.3, F_bst/P_i = 0.11.