A rectangular concrete beam 300 mm wide is subjected to a sagging moment of 20 kN-m and a torsional moment of 30 kN-m. Design a suitable depth for the beam and the required. longitudinal reinforcement Allowable stresses are: Ocb = 5 N/mm; Os = 140 N/mm and m = 19 The following criteria given in the code may be used for design: Equivalent bending moment Mel = M+MT Where M bending moment at the cross- 1+D/b section and M, = T 1.7 %3D Where T= Torsional moment, D= overall depth of beam and b = breadth of beam. If M, given by the above equation exceeds the numerical value of the moment M, longitudinal reinforcement shall be provided on the flexural compression face such that the beam can also withstand an equivalent moment Me2 =MT-M Being taken as acting in the opposite sense to the moment M.

A rectangular concrete beam 300 mm wide is subjected to a sagging moment of 20 kN-m and a torsional moment of 30 kN-m. Design a suitable depth for the beam and the required. longitudinal reinforcement Allowable stresses are: Ocb = 5 N/mm; Os = 140 N/mm and m = 19 The following criteria given in the code may be used for design: Equivalent bending moment Mel = M+MT Where M bending moment at the cross- 1+D/b section and M, = T 1.7 %3D Where T= Torsional moment, D= overall depth of beam and b = breadth of beam. If M, given by the above equation exceeds the numerical value of the moment M, longitudinal reinforcement shall be provided on the flexural compression face such that the beam can also withstand an equivalent moment Me2 =MT-M Being taken as acting in the opposite sense to the moment M.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Planar Stresses

Question

A rectangular concrete beam 300 mm wide
is subjected to a sagging moment of 20 kN-m
and a torsional moment of 30 kN-m. Design
a suitable depth for the beam and the
required.
longitudinal
reinforcement
Allowable stresses are:
Ocb = 5 N/mm; O = 140 N/mm and m = 19
The following criteria given in the code may
be used for design:
Equivalent bending moment Mel = M+MT
Where M
bending moment at the cross-
1+D/b
section and M, = T
1.7
%3D
Where T= Torsional moment,
D= overall depth of beam and
b = breadth of beam.
If M, given by the above equation exceeds
the numerical value of the moment M,
longitudinal reinforcement shall be provided
on the flexural compression face such that
the beam can also withstand an equivalent
moment Me2 =MT-M
Being taken as acting in the opposite sense
to the moment M.

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