B 72
[Subsidiary]
CAP. 123]
Building (Construction) Regulations
[1985 Ed.
(2) Where the length (L) of a beam between adequate lateral restraints exceeds 20 times the breadth (B) of its compression flange, the compressive stress in the concrete shall not exceed the maximum permissible stress specified in Table XXVII multiplied by the coefficient specified in Table XXVIII for the appropriate L/B ratio.
TABLE XXVIII
Stress reduction coefficients for beams
(1) (2) (3) (4) (5) (6) Slenderness ratio L/B 30 40 50 60 Coefficient 1/00 0.75 0.50 0.25 0Stresses in reinforcement.
Note: Intermediate values shall be found by linear interpolation.
117. (1) Subject to the provisions of regulations 118 and 120, the tensile and compressive stresses in reinforcement shall not exceed the maximum permissible stresses specified in Table XXIX for each kind of stress.
L.N. 294/76.
TABLE XXIX
Maximum permissible stresses in reinforcement in reinforced concrete
Kind of stress Mild steel complying with BS 449:1969 Steel with minimum yield point fy MPa Not Exceeding 40 mm Exceeding 40 mm Tension other than tension in shear reinforcement 125 110 0.5fy or 185 whichever is the lesser Tension in shear reinforcement 125 110 0.5fy or 140 whichever is the lesser Compression in longitudinal reinforcement in axially loaded columns and in main reinforcement in beams and slabs where the compressive resistance of the concrete is not taken into account 125 110 0.5fy or 140 whichever is the lesser Compression in longitudinal reinforcement in columns other than axially loaded columns and in main reinforcement in beams and slabs where the compressive resistance of the concrete is taken into account The calculated compressive stress in the surrounding concrete multiplied by the modular ratio but not exceeding 125 110 0.5fy or 140 whichever is the lesserB 72
[Subsidiary]
CAP. 123]
Building (Construction) Regulations
[1985 Ed.
(2) Where the length (L) of a beam between adequate lateral restraints exceeds 20 times the breadth (B) of its compression flange, the compressive stress in the concrete shall not exceed the maximum permissible stress specified in Table XXVII multiplied by the co- efficient specified in Table XXVIII for the appropriate L/B ratio.
TABLE XXVIII
Stress reduction coefficients for beams
(1)
(2)
(3)
(4)
(5)
(6)
Slenderness ratio Lị B
30
40
50
60
Coefficient
1/00
0.75
0.50
0.25
0
Stresses in reinforcement.
Note: Intermediate values shall be found by linear interpolation.
117. (1) Subject to the provisions of regulations 118 and 120, the tensile and compressive stresses in reinforcement shall not exceed the maximum permissible stresses specified in Table XXIX for each kind of stress.
L.N. 294/76.
TABLE XXIX
Maximum permissible stresses in reinforcement in reinforced concrete
Maximum permissible stresses in reinforcement MPa
Mild steel complying
with BS 449:1969
3
Kind of stress
Not Exceeding
Exceeding
Steel with minimum yield point f, MP
40 mm
40 mm
Tension other than tension in
shear reinforcement
125
110
0.5, or 185 which-
ever is the lesser
Tension in shear reinforcement
125
110
0.5, or 140 which-
ever is the lesser
Compression in longitudinal rein-
forcement in axially loaded columns and in main reinforce- ment in beams and slabs where the compressive resistance of the concrete IS not taken into account
125
110
0.5, or 140 which- lever is the lesser
Compression in longitudinal rein- The calculated compressive stress in the sur-
forcement in columns other than axially loaded columns and in main reinforcement in beams and slabs where the compressive resistance of the concrete is taken into account
rounding concrete multiplied by the modular ratio but not exceeding
125
110
0.5 for 140 which-
ever is the lesser
No comments yet.
Private notes are available after approval.