RCC Structures Design
If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is

w (R/T)
w √(R² + T²)/T
w (R + T)/T
w √(R + T)/T

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RCC Structures Design
Steel beam theory is used for

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

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RCC Structures Design
The spacing of transverse reinforcement of column is decided by the following consideration.

Forty-eight times the diameter of transverse reinforcement
The least lateral dimension of the column
Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column
All listed here

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