1964_BUILDING_(CONSTRUCTION)_REGULATIONS — Page 109

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1985 Ed.]

Building (Construction) Regulations

[CAP. 123

B 109

[Subsidiary]

(1) based on the tensile reinforcement,

Mr = Ast Pstla

(2) based on the resistance to crushing of the concrete in compression,

Mr = Pcb bd12⁄4

where-

la = is the lever arm, which may be taken as d1 - 3 Ast Pst⁄4bpcb

Ast = is the area of tensile reinforcement;

Pst = is the permissible tensile stress in the reinforcement;

Pcb = is the permissible compressive stress in the concrete in bending;

b = is the breadth of the section; and

d1 = is the effective depth to the tensile reinforcement;

(3) where it is necessary for the resistance moment to exceed Pcb⁄4 bd12, compressive reinforcement should be provided so that

Mr = Pcb bd12⁄4 + AscPsc (d1 - d2)

where

Asc = is the area of compressive reinforcement;

Psc = is the permissible compressive stress in the steel, or 380(1 - dn⁄do)MPa, whichever is the lesser;

dn = is the depth of the concrete in compression; and

d2 = is the depth to the compressive reinforcement.

The area of tensile reinforcement shall be such that the stress in the steel does not exceed the permissible stress.

164. (1) The resistance moment when compressive reinforcement is not provided may be assumed to be the lesser of the 2 values calculated from the following equations:

(a) based on the tensile reinforcement,

M1 = AsPu(d1

L.N. 294/76.

Simplified formulae for T-beams or L-beams in load factor method.

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1985 Ed.] Building (Construction) Regulations [CAP. 123 B 109 [Subsidiary] (1) based on the tensile reinforcement, Mr = Ast Pstla (2) based on the resistance to crushing of the concrete in compression, Mr = Pcb bd12⁄4 where- la = is the lever arm, which may be taken as d1 - 3 Ast Pst⁄4bpcb Ast = is the area of tensile reinforcement; Pst = is the permissible tensile stress in the reinforcement; Pcb = is the permissible compressive stress in the concrete in bending; b = is the breadth of the section; and d1 = is the effective depth to the tensile reinforcement; (3) where it is necessary for the resistance moment to exceed Pcb⁄4 bd12, compressive reinforcement should be provided so that Mr = Pcb bd12⁄4 + AscPsc (d1 - d2) where Asc = is the area of compressive reinforcement; Psc = is the permissible compressive stress in the steel, or 380(1 - dn⁄do)MPa, whichever is the lesser; dn = is the depth of the concrete in compression; and d2 = is the depth to the compressive reinforcement. The area of tensile reinforcement shall be such that the stress in the steel does not exceed the permissible stress. 164. (1) The resistance moment when compressive reinforcement is not provided may be assumed to be the lesser of the 2 values calculated from the following equations: (a) based on the tensile reinforcement, M1 = AsPu(d1 L.N. 294/76. Simplified formulae for T-beams or L-beams in load factor method.

Baseline (Original)

1985 Ed.] Building (Construction) Regulations [CAP. 123 B 109 [Subsidiary} (1) based on the tensile reinforcement, M, = Asi Psila (2) based on the resistance to crushing of the concrete in compression, where-l Pch bd12 M. 4 is the lever arm, which may be taken as d1 3 As Pst 4bp.b is the area of tensile reinforcement; Ast Pst is the permissible tensile stress in the rein- forcement; Peh is the permissible compressive stress in the concrete in bending; h is the breadth of the section; and d1 is the effective depth to the tensile rein- forcement; (3) where it is necessary for the resistance moment to exceed Peh 4 2 -bd,2, compressive reinforcement should be provided so that M = Pch bd,2 + AscPs (dr — d2) Pch_bd12 where 4. NC Psc dn d2 4 is the area of compressive reinforcement; is the permissible compressive stress in the steel, or 380(1 d)MPa, do whichever is the lesser; is the depth of the concrete in compression; and is the depth to the compressive reinforce- ment. The area of tensile reinforcement shall be such that the stress in the steel does not exceed the permissible stress. 164. (1) The resistance moment when compressive reinforce- ment is not provided may be assumed to be the lesser of the 2 values calculated from the following equations: (a) based on the tensile reinforcement, M1 = AsPu(di 2 L.N. 294/76. Simplified formulae for T-beams or L-beams in load factor method.

2026-05-04 08:23:03 · Baseline

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1985 Ed.]

Building (Construction) Regulations

[CAP. 123

B 109

[Subsidiary}

(1) based on the tensile reinforcement,

M, = Asi Psila

(2) based on the resistance to crushing of the concrete in

compression,

where-l

Pch bd12

is the lever arm, which may be taken as

3 As Pst 4bp.b

is the area of tensile reinforcement;

Ast

Pst

is the permissible tensile stress in the rein- forcement;

Peh

is the permissible compressive stress in the concrete in bending;

is the breadth of the section; and

is the effective depth to the tensile rein- forcement;

(3) where it is necessary for the resistance moment to exceed

Peh

-bd,2, compressive reinforcement should be provided

so that

M = Pch bd,2 + AscPs (dr — d2)

Pch_bd12

where 4.

Psc

is the area of compressive reinforcement; is the permissible compressive stress in the steel, or

380(1

d)MPa, do

whichever is the lesser;

is the depth of the concrete in compression; and

is the depth to the compressive reinforce-

ment.

The area of tensile reinforcement shall be such that the stress in the steel does not exceed the permissible stress.

164. (1) The resistance moment when compressive reinforce- ment is not provided may be assumed to be the lesser of the 2 values calculated from the following equations:

(a) based on the tensile reinforcement,

M1 = AsPu(di

L.N. 294/76.

Simplified formulae for T-beams or L-beams in load factor method.

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