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RCC Structures Design

RCC Structures Design
Design of R.C.C. simply supported beams carrying U.D.L. is based on the resultant B.M. at

Quarter span
Every section
Supports
Mid span

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RCC Structures Design
‘P’ is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The maximum stress ‘f’ in the beam, subjected to a maximum bending moment ‘M’, is

f = (P/'+ (Z/M)
f = (P/A) + (M/6Z)
f = (A/P) + (M/Z)
f = (P/A) + (M/Z)

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RCC Structures Design
If d is the diameter of a bar, ft is allowable tensile stress and fb, is allowable bond stress, the bond length is given by

ft .d/4fb
(π/4). (ft .d3/fb)
(π/4). (ft .d/fb)
π ft .d²/fb

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RCC Structures Design
For a number of columns constructed in a rcjw, the type of foundation provided, is

Strip
Footing
Strap
Raft

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RCC Structures Design
If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and σc are the modular ratio and maximum stress in the configuration of concrete, the strength of column is

σc(A - Asc) + m σcAsc
σcAc + m σcAsc
All listed here
σc[A + (m - 1)Asc]

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RCC Structures Design
A foundation rests on

Sub-grade
Base of the foundation
Foundation soil
Both B and C

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