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
Bar and plate analogues
- Accelerated calculation of forces in bar analogs.
- Added the ability to integrate forces from source volumetric elements of the plate analog into target plates of the plate analog, considering nodal forces in volumetric elements.
- Added an option in the Copy objects dialog to copy bar and plate analogs (BA / PA). The option works separately for each BA / PA and applies only if the target bar/plate and all source finite elements of the BA / PA are selected for copying.
- Implemented new mosaic modes of bar and plate analogs for control and documentation of input data.
Bar and plate analogues
The user can perform analysis of composite structures modelled by a set of 3D elements as plates using the system Plate Analogues.
The concept of plate analogues (PA) is that the resulting forces at the centre of the target plate of a PA are calculated from the stresses in the initial 3D elements. PA membrane forces are obtained by integrating normal and tangential stresses over the thickness of the structure; bending moments are obtained by integrating the product of stresses over the corresponding coordinate over the thickness; and shear forces are obtained by integrating tangential stresses over the thickness.
Modelling of engineering objects, such as large thickness foundation slabs, arch vaults, tunnels, multi-layer structures, retaining structures and hydraulic structures (dams, weirs) is often carried out using 3D finite elements. However, this approach can limit the subsequent design stage of these objects. When the Plate Analogues are used for these structures, it is possible to design plate analogues (select and/or check the specified reinforcement in RC elements, check strength in masonry and masonry reinforcing structures, select meshes and longitudinal reinforcement in walls) based on the obtained internal forces in the target plates (PA).






