UFC 4-023-03
25 January 2005
= 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 (20 + 4 no) or 60
no
= Number of stories
In English units and in each direction, internal ties must have a required tie 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
= Dead Load (lb/ft2)
where:
D
= Live Load (lb/ft2)
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 (ft)
Ft
= "Basic Strength" = Lesser of (4.5 + 0.9 no) or
13.5
no
= Number of stories
Whenever walls occur in plan in one direction only (e.g. "cross wall" or "spine
wall" construction), the value of lr used when assessing the tie force in the direction
parallel to the wall must be taken as either the actual length of the wall or the length
which may be considered lost in the event of an accident, whichever is the lesser. The
length that may be considered lost is taken as the length between adjacent lateral
supports or between a lateral support and a free edge, as defined in Table 4-2.
4-2.6
Peripheral Ties.
At each floor level and roof level, provide an effectively continuous peripheral
tie, capable of providing a design tie strength equal to 1.0 Ft, in kN (kip), located within
1.2 m (3.9 ft) of building edges or within the perimeter wall.
4-3
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