UFC 4-023-03
25 January 2005
8-2.4
Internal Ties.
8-2.4.1
Distribution and Location.
Distribute these ties at each floor and roof level in two directions
approximately at right angles. They must be effectively continuous and must be
anchored to peripheral ties at each end (unless continuing as horizontal ties to columns
or walls). They may, in whole or in part, be spread evenly in the floor diaphragm or may
be grouped at or in beams, walls or other appropriate positions, but at spacings not
greater than 1.5 lr, where lr is the greater of the distances between the centers of the
frames or walls supporting any two adjacent floor spaces in the direction of the tie under
consideration (i.e., approximately the span length associated with the tie). In walls, they
must be within 0.5 m (1.6 ft) of the top or bottom of the floor diaphragm.
8-2.4.2
Strength.
In SI units and in each direction, internal ties must resist a tension (in kN/m
width) equal to the greater of:
a)
(1.0D + 1.0L)
lr
Ft
(kN/m)
3.1
4.6
or
b)
1.0 Ft
(kN/m)
= Dead Load (kN/m2)
where:
D
= Live Load (kN/m2)
L
lr
= Greater of the distances between the centers of
the columns, frames or walls supporting any two
adjacent floor spaces in the direction of the tie
under consideration (m)
Ft
= "Basic Strength" = Lesser of (7.3 + 1.46 no) or
21.9
no
= Number of stories
In English units and in each direction, internal ties must have a required tensile strength
(in kip/ft width) equal to the greater of:
a)
(1.0D + 1.0L)
lr 1.0 Ft
(kip/ft)
156.6
16.4 3.3
or
b)
1.0 Ft
(kip/ft)
3.3
8-2
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