The adjacent surface to anchor plate is also subjected to tensile force at end section and se are called as spalling forces, eccentric forces and multiple cables, symmetric prism method may be used, this consists of a prism of concrete of side equal to twice distance of prestressing force from nearest free edge.

The distribution of bursting stresses d?/d = 0.8 and for d?/d = 0.5 are shown below:

The main aim of stress analysis in anchorage zone is to obtain transverse tensile stress distribution in end block from which total transverse bursting tension could be computed, effect of transverse tensile stresses is to develop a zone of bursting tension in a direction perpendicular to anchorage forces.

p_k = 100kn, 2y_po = 50mm, 2y_po = 100mm, y_po/y_o =0.5, f_c = (100�10³/100�100) = 10n/mm², f_v(max) = f_c(0.98-0.825(y_po/y₀)) = 10(0.98-0.825(0.5)) = 5.68n/mm².

Zienlinski and Rowe developed empirical relations to compute maximum transverse tensile stress and bursting tension and when an end block is subjected to a concentrated load at end face and at equal distances to 0.5y? distribution of transverse stress is found to be maximum.

The longitudinal extent of concrete member which is rectangular in cross section is at least equal to largest transverse dimension of cross section; axial flexural beam analysis at one half depth of section away from loaded area enables to determine longitudinal edge tension force.

The member within or ahead of anchorage zone will not have any discontinuities but y are subjected to stress during prestressing, more detailed analysis is required such as strut-and-ties models or anor analytical procedures to find out spalling forces for larger spacing.

The bursting force with depth of beam d? and depth of anchor plate d is given by:
P_b = 0.3P (1-d?/d), distribution of bursting stress for d?/d = 0.8 and d?/d = 0.5 are given as distance along transmission line.

According to st.venant?s principle, stress distribution at a distance far away from loaded face (normally at a distance equal to or greater than depth of beam) can be computed from simple bending ory.

The prestressing force is applied as a concentrated force in a tendon along anchorages during stress distribution in end blocks, compressive stresses of concrete ahead of anchorage devices, location and magnitude of bursting force and edge tension forces can be estimated with approximate method of design of end blocks when accurate analysis are not available.