Function
- Define the plastic hinge data to be used in Pushover analysis.
Call
From the main menu, select [Poshover] tab > [Properties] group > [Hinge Properties] > [Define Pushover Hinge Properties]
Input
Define Pushover Hinge Data Type/Properties dialog
Click the Add button to define plastic hinge information in the dialog box below. Click the Modify/Show button to confirm or modify and the Delete button to delete the data entry.
After defining the hinge type and assigning it to the selected members, check on the Show Generated Hinges in the Define Pushover Hinge Data dialog box to check the automatically calculated hinge data by the section information. After specifying the hinge data you want to check, click the Modify/Show button to see what you have entered. Corrections to the assigned hinge data are not permitted here.
When members are assigned hinge properties, inherent titles are assigned to the automatically generated hinge data. For example, "B31_PMM" represents:
B: Element Type (B: Beam, T: Truss, SPR: GL-Link)
31: Element Number
PMM : Name of Pushover Hinge Property referenced by the assigned hinge. Hinge properties of each element are automatically generated according to the sectional information. For reinforced concrete members, reinforcing steel must be pre-determined through the design feature in midas. Reinforcing steel data for the relevant sections must be provided in Modify Beam (Column, Brace & Wall) Section Data of Concrete Design Parameter. If the automatic design feature for reinforced concrete members (Concrete Code Design) is used, you are required to enter the reinforcing data using the Update Rebar button in the Design Result dialog box for each element.
Strength calculation method for Value Type Steel Section
1. Sectional information such as Area, Asy, Asz, Cym, Cyp, Czm, Czp, Zyy, and Zzz cannot be 0 for auto-calculation (Zyy, Zzz are new items added in Value Type and can be checked in Model > property > Section).
2. Hinge strength is calculated for P, My-Mz, Vy-Vz, and PMM.
3. For Yielding, the PM-Curve is generated on the basis of Pc (compressive strength), Pt (tensile strength), and M0 (flexural strength at P=0, or Fy×yy, Fy×zz).
4. For Ultimate, the PM-Curve is generated on the basis of Pc (compressive strength), Pt (tensile strength), and M0 (flexural strength at P=0, or Fy×Zyy, Fy×zz).
Add/Modify Hinge Properties dialog
Element Type
Defines the behavioral characteristics of the member. Depending on the type of element selected, the inputable section strength components, the type of history curve, etc. will vary.
Beam/Column : Allows you to define hinge properties for six directions.
Truss : defines the hinge characteristics for the axial component of the member.
General Link : Allows you to define hinge properties for six directions.
Point Spring Support : Allows you to define hinge properties for six directions.
Material Type
Specific the type of material used to the corresponding element. Depending on the material selected, the yield strength of each element is defined differently.
Definition
Moment - Rotation (M-θ) : Defined as a moment-rotation angle relationship
Moment - Curvature (M-φ Lumped) : Defined as moment - curvature relationship (bistep firing)
Moment - Curvature (M-φ Lumped) allows Hinge Length input and Integration Point selection
Moment - Curvature (M-φ Distributed) : Defined as moment-curvature relationship (element length direction numerical integration)
Interaction Type
Select whether to consider axial force fluctuations in column members.
Component Properties
Defines the plastic hinge properties by component. For more information, see Inelastic Hinge Properties.
Enter I-end and J-end's Hinge Length Ratio(Lp/L) when selecting Consider Hinge Length from Moment - Curvature (M-φ Lumped)