The 'end block' in a post-tensioned member is specially designed for:
Choose the correct answer
Normal bending moment at midspan
Bursting tensile stresses in the anchorage zone where concentrated prestress force disperses to full section
Shear force at supports only
Flexural cracking in span
Correct Answer
B. Bursting tensile stresses in the anchorage zone where concentrated prestress force disperses to full section
Why is this the answer?
End block (anchorage zone): high concentrated force from prestressing jack is applied over small bearing plate → spreads to full cross-section over a distance approximately equal to the depth. High bursting (tensile) stresses develop transverse to the tendon direction. End block reinforcement (helical or orthogonal stirrups = 'Magnel zone' reinforcement) resists bursting. IS 1343 provides design guidance.
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