| SECTION 1715 MATERIAL AND
TEST STANDARDS
1715.1 Test standards for
joist hangers and connectors.
1715.1.1 Test standards
for joist hangers. The vertical load-bearing capacity,
torsional moment capacity and deflection characteristics
of joist hangers shall be determined in accordance withASTMD1761
using lumber having a specific gravity of 0.49 or greater,
but not greater than 0.55, as determined in accordance with
AF&PA NDS for the joist and headers.
Exception: The joist length
shall not be required to exceed 24 inches (610 mm).
1715.1.2 Vertical load capacity
for joist hangers. The vertical load capacity for the
joist hanger shall be determined by testing a minimum of
three joist hanger assemblies as specified in ASTM D 1761.
If the ultimate vertical load for any one of the tests varies
more than 20 percent from the average ultimate vertical
load, at least three additional tests shall be conducted.
The allowable vertical load of the joist hanger shall be
the lowest value determined from the following:
1. The lowest ultimate vertical
load for a single hanger from any test divided by three
(where three tests are conducted and each ultimate vertical
load does not vary more than 20 percent from the average
ultimate vertical load).
2. The average ultimate vertical
load for a single hanger from all tests divided by three
(where six or more tests are conducted).
3. The average from all tests
of the vertical loads that produce a vertical movement
of the joist with respect to the header of 0.125 inch
(3.2 mm).
4. The sum of the allowable
design loads for nails or other fasteners utilized to
secure the joist hanger to the wood members and allowable
bearing loads that contribute to the capacity of the hanger.
5. The allowable design load
for the wood members forming the connection.
1715.1.3 Torsional moment
capacity for joist hangers. The torsional moment capacity
for the joist hanger shall be determined by testing at least
three joist hanger assemblies as specified in ASTM D 1761.
The allowable torsional moment of the joist hanger shall
be the average torsional moment at which the lateral movement
of the top or bottom of the joist with respect to the original
position of the joist is 0.125 inch (3.2 mm).
1715.1.4 Design value modifications
for joist hangers. Allowable design values for joist
hangers that are determined by Item 4 or 5 in Section 1715.1.2
shall be permitted to be modified by the appropriate duration
of loading factors as specified in AF&PA NDS but shall
not exceed the direct loads as determined by Item 1, 2 or
3 in Section 1715.1.2. Allowable design values determined
by Item 1, 2 or 3 in Section 1715.1.2 shall not be modified
by duration of loading factors.
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