UFC 4-023-03
25 January 2005
reinforcing bars using 135 degree hooks with a six-diameter (but not less than 3 in)
extension.
Tie each load-bearing wall continuously from the lowest to the highest level.
6-2.5
Internal Ties.
6-2.5.1
General.
Anchor internal ties to peripheral ties at each end, or else, they must continue
as wall or column ties. They must be effectively straight and continuous through the
entire length of the slab, beam or girder. Internal ties may be provided:
uniformly throughout the floor or roof width,
concentrated, with a 6 m (19.7 ft) maximum horizontal tie spacing; or
within walls no more than 0.5 m (1.6 ft) above or below the floor or roof
and at 6 m (19.7 ft) maximum horizontal spacing (in addition to peripheral
ties spaced evenly in the perimeter zone).
6-2.5.2
Two Way Spans.
In SI units and in both directions in a two way span, the internal ties must
resist a required tie strength (in kN/m width) equal to the greater of:
a)
(1.0D + 1.0L)
La Ft
(kN/m)
7.5
5
or
b)
1.0 Ft
(kN/m)
= Dead Load (kN/m2)
where:
D
= Live Load (kN/m2)
L
La
= Lesser of: i) the greatest distance in the direction
of the tie between the centers of columns or other
vertical load-bearing members where this distance
is spanned by a single slab or by a system of
beams and slabs, or, ii) 5 h. (m)
h
= Clear story height (m)
Ft
= "Basic Strength" = Lesser of (20 + 4 Ns) or 60
Ns
= Number of stories including ground and basement
In English units and in both directions in a two way span, the internal ties must resist a
required tie strength (in kip/ft width) equal to the greater of:
a)
(1.0D + 1.0L)
La
1.0
Ft
(kip/ft)
6-2
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