UFC 4-023-03
25 January 2005
Table D-3 Nonlinear Hinge Properties (absolute rotation in radians)
A
B
C
D
E
Beam
Section
θ
θ
θ
θ
θ
Mrel
M
M
Mrel
Mrel
W18x35
1
0
1
0.0106
1
0.0349
0.01
0.035
0.01
0.05
W18x40
1
0
1
0.0104
1
0.0349
0.01
0.035
0.01
0.05
W18x55
1
0
1
0.0103
1
0.0349
0.01
0.035
0.01
0.05
*If designer is using SAP, the moment hinge criteria for columns should be derived from
FEMA 356, Table 5-6, where moment-interaction is accounted for through varying
deformation allowables based on the ratio of axial load to column axial capacity.
D-5
ALTERNATE LOAD PATH ANALYSIS.
The software used and screen shots depicted for this example was SAP
2000NL. The details of this example can be generally applied in any structural software
capable of nonlinear static analysis. The "Staged Construction" option in SAP was used
to ensure proper redistribution of loads upon member removal. Comparable software
should also have the capability of load redistribution, or loads must be redistributed
manually.
D-5.1
Develop Preliminary Model.
Build, analyze, and design model as described in part 2 of this example. See
Figure D-7 for a concept of how the model should look in SAP.
D-9
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