VERSION HISTORY
LIRA-FEM
- Mass redistribution
- Damping ratio
- Seismic isolators
- Pushover Analysis
- Finite element "Joint"
- New types of perfectly rigid body (PRB)
- Nonlinear behaviour of soil
- New type of force
- Nonlinear custom cross-sections
- Accounting for orthotropy
- Analysis parameters
- Analysis of reactions
- Stresses and forces
- Dynamics
- Nonlinearity
- Finite elements
- Calculation and Performance
Finite element "Joint"
The option "Unloading with initial stiffness" is added for the FE of joint. Unloading is performed by an elastic-plastic model with initial stiffness from the point of the current state. Re-loading is performed along the path of the previous unloading, so the joint will return to the point with the maximum strain that was achieved earlier. The relationship between the vertical stiffness and the shear stiffness for the FE of joint is shown in the figure below.
Behaviour of the FE of joint during unloading (vertical and shear stiffness)