RCC Structures Design
If ‘A’ is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force ‘P’ through its centroidal longitudinal axis, the compressive stress in concrete, is

P/A
P/2A
A/P
2A/P

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RCC Structures Design
Steel beam theory is used for

Doubly reinforced beams ignoring compressive stress in concrete
Design of simple steel beams
Beams if shear exceeds 4 times allowable shear stress
Steel beams encased in concrete

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