Define Pushover Hinge Properties

 

 

 

Define the plastic hinge data to be used in Pushover analysis.

Note

Hinge properties such as yield strength are calculated based on the specified design code in Design>Concrete/Steel Design Parameter>Design code.

 

 

 

From the Main Menu select Pushover > Assign Hinge Properties > Define Pushover Hinge Properties

 

 

 

Click the button to define plastic hinge information in the dialog box below. Click the button to confirm or modify and the button to delete the data entry. Select the pushover hinge to be copied in the dialog box and click button.

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. Select the hinge data to be checked and click the button to prompt the Add/Modify Hinge Data Type dialog box in which the button is clicked to check the hinge data. Corrections to the assigned hinge data are not permitted here.

Note 1

When members are assigned hinge properties, inherent titles are assigned to the automatically generated hinge data. For example, "B1IM" represents:

B: Hinge assigned to a beam element

1: Sequential number assigned to by element types

I: Location of hinge on an element

M: Assigned hinge type (My-Mz)

 

Note 2

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 button in the Design Result dialog box for each element.

 

Note 3

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).

 

Hinge Properties Type Name

 

Define names of plastic hinge properties.

Description

 

State a brief description related to the pushover hinge properties.

Element  Type

 

Specify the type of element.

 

Beam/Column : Beam or Column element

           

Truss : Truss element    

                                      

General Link : Spring which can be defined at Model>Boundaries>Define General Link Properties

 

Material Type

 

Specify the type of material used to the corresponding element.

 

RC / SRC (encased) : RC or SRC (Concrete encased steel type)

 

Steel / SRC (filled) : Steel or SRC (Concrete filled steel tube type)

 

Definition

 

Specify the load-deformation relationship of the flexural member.

 

Moment-Rotation (M-θ)

 

Moment-Curvature (M-φ Lumped)

Consider Hinge Length : Check on to assign pushover hinge to the specified hinge length.

Integration Point : Select the integration point location to End or Center of the hinge length.

<When Integration Point is “End”>

<When Integration Point is “Center”>

 

Moment-Curvature (M-φ Distributed)

 

Interaction Type

 

None : Axial force and biaxial moments are uncoupled from each other.  

 

P-M in Status Determination : Coupled axial force-biaxial moment behavior is reflected by calculating the flexural yield strength of a hinge considering the effect of axial force.

 

P-M-M in Status Determination : Coupled axial force-biaxial moment behavior is reflected by calculating the flexural yield strength of a hinge considering the effect of axial force.

 

Component Properties

 

Fx, Fy, Fz, Mx, My, Mz : Check on the degree of freedom to be assigned to the plastic hinge type.  

 

Hinge Location : Specify the hinge location within the corresponding element.  

 

Number of Section : Specify the number of integration points when Definition is selected as 'Moment-Curvature (M-φ Distributed)'.

 

Skeleton Curve : Specify the skeleton curve.

 

Note 1

The skeleton curves available are as follows:

1. Bilinear Type (or Slip Bilinear Type)

2. Trilinear Type (or Slip Trilinear Type).  

3. FEMA Type

Slip Bilinear Type or Slip Trilinear Type is activated when the Element Type is defined as 'Truss' or 'General Link'.  

 

Note 2

The Multi-Linear Type is applicable for both the load control and the displacement control methods and both FEMA and Eurocode 8 type is applicable only for the displacement control method.  

 

Enter the relevant hinge properties in the following dialog box:

 

 

■ When Interaction Type is None and Skeleton Curve is Bilinear / Trilinear type

 

■ When Interaction Type is None and Skeleton Curve is FEMA

 

■ When Interaction Type is None/P-M and Skeleton Curve is GSD Imported

 

■ When Interaction Type is P-M-M in Status Determination

 

 

Note Hinge properties by Element Types and Definitions