Function
Add, modify or delete the properties of Isolator elements.
Call
From the Main Menu select [Boundary] tab > [Advanced] group > [Seismic Device] > [Isolator (MSS)]
Input
To enter or add new properties of Isolator elements, click the Add button.
To modify the properties of Isolator elements already defined, select a name from the list of Isolator property, click the Modify button and change appropriate data entries.
To modify the properties of Isolator elements already defined, select a name from the list of Isolator properties, click the Delete button and change appropriate data entries.
Name
Enter the name of Seismic Device.
Device Type
Fig. Lead Rubber Bearings (LRB)
Fig. Natural Rubber Bearings (NRB)
Fig. Sliding Bearings
Adjustment parameters
Enter factors to consider the performance change of isolators with rubber or lead as temperature changes. These factors are different depending on the characteristics of the product. Therefore, it is recommended to use the values provided by the manufacturer. Default value is 1 and thus the effect will not be reflected.
LRB Isolator Properties
Ar : Bubber Corss Section Area
Tr : Total Thickness of Rubber Laminas
The Horizontal Direction Properties(Dy-Dz)... button
Fig. Force – Shear Deformation Curve
Ko : Initial Stiffness (Ku=Ko)
K2 : 2nd Stiffness (=Kd)
Qd : Characteristic Strength of LRB
Fig. Force – Shear strain Curve
γ : Shear strain of sub-shear-spring (= δ / Tr)
δ : shear deformation of sub-shear-spring (=D)
Tr : Total rubber thickness
CK2, CQd are correction coefficients due to horizontal secondary stiffness and strain load dependence of strain.
It is represented by the following shear strain γ (γ = δ / Tr).
The Vertival Direction Properties(Dx)... button
Kv(c) : Vertical stiffness ( The linearity type is applied with the same stiffness for the tension and compression)
Consider Vertical Direction Nonlinearity : Check on the option in case of consideration of Nonlinearity.
Fig. linear analysis
Fig. Nonlinear analysis
NRB Isolator Properties
Ar : Bubber Corss Section Area
Tr : Total Thickness of Rubber Laminas
The Horizontal Direction Properties(Dy-Dz)... button
Kh : Horizontal stiffness
The Vertical Direction Properties(Dx)... button
Kv(c) : Vertical stiffness ( The linearity type is applied with the same stiffness for the tension and compression)
Consider Vertical Direction Nonlinearity : Check on the option in case of consideration of Nonlinearity.
Fig. linear analysis
Fig. Nonlinear analysis
SLD Isolator Properties
As : Area of the sliding Head
Qd : Friction force
1) Case 1 : Qd = μ0 X Pi (Pi : Axial force by user input)
2) Case 2 : Qd = μ0 X P0 (P0 : Axial force by Analysis)
The Horizontal Direction Properties(Dy-Dz)... button
K0 : Initial stiffness
Μ0 : Frictional Factor
The Vertical Direction Properties(Dx)... button
Kv(c) : Vertical stiffness
Hysteresis Properties
Fig. Modified Bilinear Model
Fig. Modified HD Model (Hardin-Drnevich Model)
Ka : It is calculated by γm
Ke : Initial Stiffness
Ko : Ko = (Ke – Keq)(1+S), 
Keq : 
Upward curve : 
Downward curve : 