UFC 4-023-03
25 January 2005
4-3
ALTERNATE PATH METHOD FOR REINFORCED CONCRETE.
Use the Alternate Path method to verify that the structure can bridge over
removed elements. Follow the general procedure provided in Section 3-2.
4-3.1
Acceptability Criteria for Reinforced Concrete.
The acceptability criteria are provided in Table 4-3; calculate the design
strengths per ACI 318-02. The subsequent actions for the AP model after violation of
the acceptability criteria are detailed in the following sub-sections.
Table 4-3 Acceptability Criteria and Subsequent Action for Reinforced Concrete
Subsequent Action for
Structural Behavior
Acceptability Criteria
Violation of Criteria
Φ MnA
Element Flexure
Section 4-3.1.1
Element Combined Axial
ACI 318-02 Chapter 10
Section 4-3.1.2
ProvisionsA
and Bending
Φ VnA
Element Shear
Section 4-3.1.3
Connection Design
Connections
Section 4-3.1.4
StrengthA
Deformation Limits,
Deformation
Section 4-3.2
defined in Table 4-4
A
Nominal strengths are calculated with the appropriate material properties and over-
strength factor Ω; all Φ factors are defined per ACI 318-02.
4-3.1.1
Flexural Resistance of Reinforced Concrete.
For reinforced concrete, the flexural design strength is equal to the nominal
flexural strength calculated with the appropriate material properties and over-strength
factor Ω, multiplied by the strength reduction factor Φ. Calculate the nominal flexural
strength per ACI 318-02 procedures.
For Linear Static Analysis, if the required moment exceeds the flexural design
strength and if the reinforcement layout is sufficient for a plastic hinge to form and
4-6
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