The 'pre-stressed concrete' advantage of 'load balancing' concept means:
Choose the correct answer
Using pre-stress to replace all steel
Curved tendon vertical components balance gravity loads — at balanced load, beam experiences only uniform axial compression (no bending)
Pre-stressing eliminates the need for formwork
Balancing the mix design of concrete
Correct Answer
B. Curved tendon vertical components balance gravity loads — at balanced load, beam experiences only uniform axial compression (no bending)
Why is this the answer?
Load balancing (Lin, 1963): in PSC, curved tendon with vertical component (upward) balances a portion of gravity load. At balanced load: beam is under uniform axial compression only (no bending). Practical: pre-stress cable profile shaped to balance ~80% DL → beam acts in pure compression for DL → only remaining (unbalanced) load causes bending/shear. Reduces deflection, cracking. Very elegant concept for two-way slabs and flat plates.
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