Use the Hinge Property Data for {Property Name} form to define force controlled hinge properties. The options available on the form depend on the type of hinge being defined. The forms for all force-controlled hinge types, except Fiber, are generally the same. The form for Fiber (P-M3, P-M2-M3) differs significantly from the others and is described in a separate topic (see Hinge Property Data for {Property Name} - Fiber for more information).
For Axial P, Shear V2, Shear V3, Torsion T, Moment 2, and Moment 3
Maximum Allowed {Force, Moment} area.
Specified Proportion of Yield {Force, Moment} option and Positive and Negative edit boxes. When this option is selected, use the edit boxes to specify the proportion of the yield force or moment. The value specified will be multiplied by the maximum allowed force or moment. The Negative edit box becomes enabled when the Hinge is Symmetric check box near the bottom of the form is not checked.
User Specified {Force, Moment} option and Positive and Negative edit boxes. When this option is selected, use the edit boxes to specify the maximum allowed force or moment. The Negative edit box becomes enabled when the Hinge is Symmetric check box near the bottom of the form is not checked.
Hinge Loses All Load Carrying Capacity When Maximum {Force, Moment} Is Reached check box. When this check box is checked, the hinge capacity drops to zero after the maximum force or moment is reached. When the check box is unchecked, the hinge behavior is linear elastic.
Acceptance Criteria area. The Acceptance Criteria IO (Immediate Occupancy), LS (Life Safety) and CP (Collapse Prevention) values are deformations (displacements, strains, or rotations) that have been normalized by the same deformation scale factors used to specify the load deformation curve, and are typically located between points B and C and points B’ and C’ on the curve. They are used to indicate the state of the hinge when viewing the results of the analysis, but they do not affect the behavior of the structure.
Hinge is Symmetric (Tension Behavior Same as Compression Behavior) check box. When this check box is checked, this hinge definition will be symmetric. Any changes made to the values in the Positive edit boxes (tension) of the form will apply automatically to the Negative values (compression).
For Interacting P-M2, P-M3, M2-M3, and P-M2-M3
Capacity Factor Defining Lower Bound Strength
Capacity Factor edit box. Use this edit box to specify the capacity factor defining the lower bound strength of the hinge. The lower bound strength of the force controlled interacting hinge is determined from an interaction curve (or surface for P-M2-M3 hinge) that is constructed by multiplying the specified capacity factor and the ordinates of the interaction curve (or surface) specified for the hinge.
Hinge Loses All Load Carrying Capacity when Lower Bound Strength Is Reached check box. When this check box is checked, the hinge capacity drops to zero after the lower bound strength is reached. When the check box is unchecked, the hinge behavior is linear elastic.
Acceptance Criteria area. The Acceptance Criteria IO (Immediate Occupancy), LS (Life Safety) and CP (Collapse Prevention) values are deformations (displacements, strains, or rotations) that have been normalized by the same deformation scale factors used to specify the load deformation curve, and are typically located between points B and C and points B’ and C’ on the curve. They are used to indicate the state of the hinge when viewing the results of the analysis, but they do not affect the behavior of the structure.
Modify/Show {P-M2, P-M3, M2-M3, P-M2-M3} Interaction Surface (Capacity) Data button. Click this button to display the Hinge Interaction Surface for {Hinge Name - Hinge Type} form.
See Also
Access the Hinge Property Data for {Property Name} form as follows:
Click the Define menu > Section Properties > Frame/Wall Nonlinear Hinge command to display the Define Frame/Wall Hinge Properties form. Then do one of the following:
Click the Add New Property button. The Default For Added Hinges form, with Steel, Concrete, and User Define options, will display. Choose an option as the basis for defining the new hinge property. The Hinge Property Data form will display.
Highlight a previously defined property and click the Add Copy of Property or Modify/Show Property button. The Hinge Property Data form will display.
In the Hinge Type area, select the Deformation Controlled or Force Controlled option and then select a specific hinge type from the drop-down list.
Click the Modify/Show Hinge Property button to access the Hinge Property Data for {Property Name} form for the selected Hinge Type. This topic assumes the Force Controlled option was selected. Click here for a topic related to the Deformation Controlled option.
The Hinge Property Data for {Property Name} form also can be displayed by expanding the Properties node and then the Hinge Properties node on the Model tab in the Model Explorer window. Right-click on a hinge and then select the Modify/Show command to display the Hinge Property Data form and click the Modify/Show Hinge Property button.