Use the Hinge Interaction Surface for {Property Name} Interacting {Hinge Type} form to specify the basis for generating the interaction surface. The options include basing the interaction surface on the material property, a selected code, or user specified parameters.
Interaction Surface Options. Select one of the following options.
Default from Material Property of Associated Line Object. This is the default.
Steel, AISC-LRFD Equations H1-1a and H1-1b with phi = 1.
Steel, ASCE 41-13 Equation 9-4.
Concrete, ACI 318-02 with phi = 1. The methodology used for developing the interaction surface using the "Concrete, ACI 318-02 with phi = 1" option is the same as that documented in the Concrete Design manual except:
The phi factor is set equal to 1.
The maximum compressive axial load is not limited to Pmax.
For the pushover interaction surface, axial tension is positive, and axial compression is negative. This is an opposite sign convention from that used in concrete design.
Refer to ACI 318-02 for additional information.
User Definition. When this option is selected, click the Define/Show User Interaction Surface button to display the {Curve} Interaction Surface Definition for {Property Name} form and define or view the interaction surface/curve.
Axial Load - Displacement Relationship
Proportional to Moment-Rotation option. Choose Proportional to Moment-Rotation for an axial load-deformation relationship that hardens and softens according to the shape of the given M3/M3SF versus q3/q3SF plot.
Elastic - Perfectly Plastic option. Choose Elastic - Perfectly Plastic for an independent axial load-deformation relationship based on the maximum and minimum axial yield values from the interaction surface.
Axial Force - applies when the hinge type is an M2-M3 interacting hinge
P Associated with M2-M3 Curve (Tension Positive) edit box. Enter a value for the axial force associated with the M2-M3 curve.
See Also
Frame Hinge Property Data Form
Nonlinear Static (Pushover) Analysis
Access the Hinge Interaction Surface for {Property Name} Interacting {Hinge Type} form as follows:
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