ASSUMPTION IN LIMIT STATE OF COLLAPSE: FLEXURE

ASSUMPTION LIMIT STATE OF COLLAPSE: FLEXURE

1. Plane Section before Bending
Remains Plane even after the
Bending


2. The maximum strain in concrete at
the outermost compression fiber is
taken as 0.0035 in bending


3. Relationship between compressive
stress distribution in concrete and
strain in concrete may be assumed to
be rectangular, Trapezoidal,
parabolic or any other shape which
results in prediction of strength in
substantial agreement with the
result of test


4. The tensile strength of concrete is
ignored.

It means below the neutral axis all the tensile strength taken by reinforcement bars

5. For design purpose partial factor of
safety for steel mild steel - 1.15 and the
stress in steel are derived from
stress-strain curve.


6. Maximum strain in Tension
reinforcement in the section at
failure shall not shall be less than