1985 Ed.]
Building (Construction) Regulations
[CAP. 123
B 67
[Subsidiary]
not exceeding 75, of structural concrete cover to the compression flanges of the filler joists:
Provided that where the underside of the slab is flush with the bottom flanges of the filler joists, no allowance is to be made for 1 in respect of support moments, but, nevertheless, if the top flanges are covered, the allowance for t may be made in respect of the midspan moments.
(2) The spacing of filler joists centre to centre shall not exceed the minimum thickness of the structural concrete slab multiplied by the value n specified in Table XXVI for the imposed load specified in that Table, unless suitable transverse reinforcement is provided to the satisfaction of the Building Authority,
TABLE XXVI
Value of n for the spacing of filler joists
Imposed load in kPa of floor area Value n
Not exceeding 2.5 10
Exceeding 2.5 but not exceeding 5.0 8
Exceeding 5.0 but not exceeding 7.5 7
Exceeding 7.5 but not exceeding 10.0 6
Exceeding 10.0 5
L.N. 294/76.
107. (1) The calculated deflexion of any beam (other than a filler floor beam) shall not exceed 3/1000 of the span.
(2) The span of any filler floor beam solidly encased in concrete shall not exceed 35 times the depth measured from the bottom flange of the filler beam to the top surface of the structural concrete or 12 times that depth in the case of cantilevering fillers.
(3) The span of any beam composed of steel (other than a filler floor beam) carrying a uniformly distributed load only and complying with the appropriate provisions of-
(a) BS 4360:1972, Grade 43, shall not exceed 20 times its depth
(b) BS 4360:1972, Grade 50, shall not exceed 13 times its depth unless the calculated deflexion does not exceed 3/1000 of the span.
108. A flange plate or web plate of a column shall be not less than 10 mm thick. In all other cases, structural steel shall be not less than 6 mm thick, except-
(a) for standard rolled steel joists, standard rolled steel channels and packings;
Deflexion and span of beams. L.N. 294/76.
Thickness of steel. L.N. 294/76.
1985 Ed.]
Building (Construction) Regulations
[CAP. 123
B 67
[Subsidiary]
not exceeding 75, of structural concrete cover to the compression flanges of the filler joists:
Provided that where the underside of the slab is flush with the bottom flanges of the filler joists, no allowance is to be made for 1 in respect of support moments, but, nevertheless, if the top flanges are covered, the allowance for t may be made in respect of the midspan moments.
(2) The spacing of filler joists centre to centre shall not exceed the minimum thickness of the structural concrete slab multiplied by the value n specified in Table XXVI for the imposed load specified in that Table, unless suitable transverse reinforcement is provided to the satisfaction of the Building Authority,
TABLE XXVI/
Value of n for the spacing of filler joists
Imposed load in kPa of floor area
Value n
Not exceeding 2.5
Exceeding 2.5 but not exceeding 5.0
Excceding 5.0 but not exceeding 7.5 Exceeding 7.5 but not exceeding 10.0. Exceeding 10.0
10
8
7
6
5
L.N. 294/76.
107. (1) The calculated deflexion of any beam (other than a filler floor beam) shall not exceed 3 of the span.
(2) The span of any filler floor beam solidly encased in concrete shall not exceed 35 times the depth measured from the bottom flange of the filler beam to the top surface of the structural concrete or 12 times that depth in the case of cantilevering fillers.
(3) The span of any beam composed of steel (other than a filler floor beam) carrying a uniformly distributed load only and comply- ing with the appropriate provisions of-
(a) BS 4360:1972, Grade 43, shall not exceed 20 times its depth
(b) BS 4360:1972, Grade 50, shall not exceed 13 times its depth unless the calculated deflexion does not exceed 325 of the span.
108. A flange plate or web plate of a column shall be not less than 10 mm thick. In all other cases, structural steel shall be not less than 6 mm thick, except-
(a) for standard rolled steel joists, standard rolled steel
channels and packings;
Deflexion and span of beams.
L.N. 294/76.
Thickness of steel. L.N. 294/76.
No comments yet.
Private notes are available after approval.