UFC 4-023-03
25 January 2005
4-2.7
Horizontal Ties to External Columns and Walls.
4-2.7.1
General.
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 largest factored vertical load, carried by the column or wall at
that level, due to conventional design load combinations
(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:
a) the lesser of 2.0 Ft or (ls/8.2) Ft
(kip)
or
b) 3% of the largest factored vertical load, carried by the column or wall at
that level, due to conventional design load combinations
(kip)
where:
ls
= the floor to floor height (ft).
Where the peripheral tie is located within the wall, provide only such horizontal tying as
is required to anchor the internal ties to the peripheral ties.
4-2.7.2
Corner Column Ties.
Corner columns must be tied into the structure at each floor and roof level in
each of two directions, approximately at right angles, with ties having a required tensile
strength equal to the greater of a) or b) from Section 4-2.7.1.
4-2.8
Vertical Ties.
Each column and each load-bearing wall must be tied continuously from the
lowest to the highest level. The tie must have a design strength in tension equal to the
largest factored vertical load received by the column or wall from any one story, due to
conventional design load combinations. Between floor levels, splice the column
4-4
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