UFC 4-023-03
25 January 2005
Internal horizontal ties--can be distributed at the joists (n-s) with strap ties
and distributed in the plywood floor diaphragm (e-w)
Wall ties--internal ties can function as wall ties if connected to peripheral tie
with strap ties
Peripheral ties--wall headers with strap ties
Vertical ties--can be distributed in the walls (2x6 studs) with floor tension ties
Calculations and selected connections supporting these schemes are
presented in Table F-2. Note that candidate manufactured connections reference the
USP catalog. Figures F-3 through F-5 illustrate tie details.
Table F-2 Calculations for Tie Force Wood Member and Connection Design
Recommended
Member allowable1
Connection allowable2
Tie
connection
Every 4th joist used as a tie:
Joist to joist strap over
Internal (n-
Joist to joist strap
girder/walls (USP KSTI260 I-
s)
over girder/walls
Required tie force = 0.89 kips/ft
joist strap; 12 ga, 60 in long,
(USP KSTI260 I-
60 nails.
joist strap; 12 ga,
Joist tensile capacity = 5.7 kips
Also used as wall/horizontal
60 in long, 60 nails.
@ every 4th joist, capacity =
tie, wrapped over 2x6
(See Figure F-3)
headers and peripheral tie
1.43 kips/ft > 0.89 kips
(verify performance of strap
over header with vendor).
Capacity = 3.76 kips >
0.89(4) = 3.56 kips
Strap to exterior wall at 32 in;
Internal (e-
Plywood diaphragm used as
USP KSTI236 12
0.80(32)/12 = 2.13 kips
w)
ties:
ga, 36 in long
strap, 36 10d nails
Required tie force = 0.80 kips/ft
USP KSTI236 12 ga, 36 in
(See Figure F-3)
long strap, 36 10d nails
Check plywood alone in
tension:
Capacity = 2.26 kips > 2.13
Factored allowable = 960 psi,
kips
8.4 kips/ft >>0.89 kips/ft
Also used as wall/horizontal
tie, wrapped over 2x6
If plywood sheets staggered 4
headers and peripheral tie
ft, 12d nails @ 1 ft (joist
(verify performance of strap
spacing) and @ 6 in along
over header with vendor).
joists,
Capacity = 1.43 kips/ft > 0.89
kips/ft
1
Member allowables include capacity adjustment factors
2
Connection allowables factored to include rate adjustment. Note that catalog connection allowable
value (developed for ASD) are used here. Connector resistance may be converted (significantly
increased) by applying the connector resistance adjustment equations provided in Section 3.4 of
AF&PA's "LRFD Pre-Engineered Metal Connectors Guideline," a supplement to AWC/AF&PA "LRFD
Manual for Engineered Wood Construction," and AF&PA/ASCE 16-95 "Standard for Load Resistance
Factor Design (LRFD) for Engineered Wood Construction.
F-4
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