UFC 4-023-03
25 January 2005
= 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 (1.62 + 0.33 no) or
4.92
no
= Number of stories
Whenever walls occur in plan in one direction only (e.g. "cross wall" or "spine wall"
construction), take the value of lr used when assessing the tie force in the direction
parallel to the wall 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. Take the length
that may be considered lost as the length between adjacent lateral supports or between
a lateral support and a free edge.
8-2.5
Peripheral Ties.
At each floor level and roof level, provide an effectively continuous peripheral
tie, capable of providing a required tensile strength equal to 1.0 Ft, located within 1.2 m
(3.9 ft) of building edges or within the perimeter wall.
8-2.6
Horizontal Ties to External Walls and Columns.
In SI units, each external column and, if the peripheral tie is not located within
the wall, every meter length of external wall carrying vertical load must be anchored or
tied horizontally into the structure at each floor and roof level with a required tensile
strength (in kN) equal to the greater of:
a) the lesser of 2.0 Ft or (ls/2.5) Ft
(kN)
or
b) 3% of the total ultimate vertical load carried by the
column or wall at that level
(kN)
where:
ls
= the floor to floor height (m).
In English units, each external column and, if the peripheral tie is not located within the
wall, every 3.3 ft length of external wall carrying vertical load must be anchored or tied
horizontally into the structure at each floor and roof level with a tie with a required
tensile strength (in kips) equal to the greater of:
8-3
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