B 100
CAP. 123]
Building (Construction) Regulations
[1985 Ed.
[Subsidiary]
Drops in flat slab construction.
Reinforcement of flat slabs generally.
L.N. 294/76.
(c) in the area common to 2 column strips, of the width of the strip.
openings shall be completely framed on all sides with beams capable of carrying the loads to the columns.
(3) When framing capable of carrying the loads to the columns is not provided for openings within the limitations of paragraph (2), the remaining portions of the slab or strip shall be designed to resist the total negative or positive moments and shear so that the strength of the slab as a whole is not impaired by the openings.
152. (1) Drops shall be rectangular in plan.
(2) The thickness of a drop shall be not less than 1/4 nor more than 1/4 times the thickness of the slab.
(3) The overall width of a drop shall be not less than the panel width nor more than the panel width in that direction.
Index
(4) For exterior panels the width of the drop at right angles to the discontinuous edge and measured from the column centre line shall be the width of drop for interior panels.
153. (1) The spacing of reinforcement at critical sections shall not exceed 2 times the effective depth except in those portions of the slab which may be of cellular or ribbed construction.
(2) When the drop, if provided, is less than the full width of the column strip, the reinforcement in the thinner part of the column strip shall be of the same diameter at the same spacing as the reinforcement in the middle strip and the remainder of the reinforcement required to resist the maximum bending moments in the column strip shall be placed within the width of the drop.
(3) When the diameter of the column head is less than 2 times the diameter of the column, the reinforcement required to resist the negative moment in the column strip shall be placed in the width of the column strip and symmetrical about the line joining the column centres.
(4) At all discontinuous edges all reinforcement shall extend to within 75 mm of the edge of the panel and shall be hooked around a bar of its own or greater diameter or shall be properly anchored in the edge beam, if any.
(5) Splices-
(a) shall not be made at sections of maximum stress; and
(b) where required, should be staggered.
Page 100
Page 101
B 100
CAP. 123]
Building (Construction) Regulations
[1985 Ed.
[Subsidiary]
Drops in flat slab construction.
Reinforcement of flat slabs
generally.
L.N. 294/76.
(c) in the area common to 2 column strips, of the width of
the strip.
openings shall be completely framed on all sides with beams capable of carrying the loads to the columns.
(3) When framing capable of carrying the loads to the columns is not provided for openings within the limitations of paragraph (2), the remaining portions of the slab or strip shall be designed to resist the total negative or positive moments and shear so that the strength of the slab as a whole is not impaired by the openings.
152. (1) Drops shall be rectangular in plan.
(2) The thickness of a drop shall be not less than 14. nor more than 14, times the thickness of the slab.
(3) The overall width of a drop shall be not less than the panel width nor more than the panel width in that direction.
Inde
(4) For exterior panels the width of the drop at right angles to the discontinuous edge and measured from the column centre line shall be the width of drop for interior panels.
153. (1)/ The spacing of reinforcement at critical sections shall not exceed 2 times the effective depth except in those portions of the slab which may be of cellular or ribbed construction.
(2) When the drop, if provided, is less than the full width of the column strip, the reinforcement in the thinner part of the column strip shall be of the same diameter at the same spacing as the reinforcement in the middle strip and the remainder of the reinforce- ment required to resist the maximum bending moments in the column strip shall be placed within the width of the drop.
(3) When the diameter of the column head is less than 2 times the diameter of the column, of the reinforcement required to resist the negative moment in the column strip shall be placed in the width of the column strip and symmetrical about the line joining the column centres.
(4) At all discontinuous edges all reinforcement shall extend to within 75 mm of the edge of the panel and shall be hooked around a bar of its own or greater diameter or shall be properly anchored in the edge beam, if any.
(5) Splices-
(a) shall not be made at sections of maximum stress; and
(b) where required, should be staggered.
Page 100Page 101
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