Recent developments in LUSAS have enhanced our ability to deliver a single advanced solution for any infrastructure project. LUSAS version 19.1 extends these capabilities even further, supports more design codes, and in summary includes:
The 'LUSAS LNG Tank Analysis and Design System' is a licensed software product that allows engineers to automatically create a range of 2D and 3D finite element models of full containment circular tanks from user-defined parameters. Using these models, a range of analyses can be performed, and optional design checks carried out for specified load combinations and supported design codes.
The Steel Frame Design software option has been extended to include design checks for BS5400-3:2000
Nodes | Points | Elements | Degrees of freedom | Loadcases |
---|---|---|---|---|
1000 | 200 | 500 | 3000 | 20 |
For more information see Composite Bridge Deck Design (PontiEC4)
The Steel Composite Bridge Wizard generates the model geometry and corresponding mesh, geometric, material, support and local coordinate attributes for models of slab-on-beam composite I-girder bridges where the slab and web are modelled with shell elements and the top and bottom flanges, web stiffeners and bracing are modelled using beam elements.
Models can be defined that accommodate:
Example of a curved multi-span steel composite bridge deck with bracing created by the wizardNew Paragraph
The Composite Bridge Deck Design software option provides a consistent approach to design, regardless of the analysis approach adopted, using slice resultants to calculate design forces. This allows an analysis model to be created without having to define design details initially. It allows for the complexity of the analysis model to be increased without changing the design data, and also permits a number of changes to be made to the design information to see what the effect of a particular change would be, without having to change or solve the analysis model each time.
The following steps are required to carry out a composite bridge deck design check:
The following design code is currently supported:
Phi-c reduction attributes can now be defined and assigned to a model to assess soil stability and safety factors for soil that is represented by Mohr-Coulomb or Hoek-Brown material models. Attributes can be assigned to all or just some of the relevant features in a model, allowing the safety of a particular slope (for example) in a large analysis to be evaluated without other parts of the model being affected. Assignment is made to a particular loadcase or analysis stage, which defines the applicable loading, boundary conditions and activation status.
By its very nature, a phi-c reduction analysis will always run until solution failure, so it is best used in branched analyses where it can be used to study safety factors at several stages of construction without terminating the solution
The Hoek-Brown model is now supported. This is an elastic-perfectly-plastic constitutive model suitable for the modelling of rock failure. It is an empirical model, and its parameters are based on both laboratory test data, and visual observation of the rock. The model can be used with standard continuum elements as well as the two-phase elements.
Drained and Undrained attributes can be defined from the Attributes > Pore Water Pressures... menu item. They are used to define regions of a model where the soil is drained or undrained.
Drained and undrained attributes can be assigned to features representing soil that are meshed with two phase elements and modelled with two-phase materials in both 2D or 3D models. The use of such attributes is a conceptual shortcut from the beginning to the end of a consolidation analysis, representing the extreme undrained and drained conditions.
Two additional K0 initialisation options, 'Wroth' and 'OCR sin(phi)', have been added to the Modified Cam Clay material model to allow initial stresses in soil to be calculated.
Bridge Deck (Grillage) geometric attributes have been introduced to define geometric properties of specific types of bridge decks that are analysed with reference to, or derived from grillage formulae published by Hambly and others.
When assigned to a model along with a new Bridge Deck (Grillage) material attribute, which contains separate material definitions for the slab, girders, slab and reinforcement (for cracked sections) that are defined in the relevant Bridge Deck (Grillage) geometric attribute, users can more easily analyse the different phases of construction of these types of bridge decks with one model by the use of the multiple analysis facility. In short, one set of grillage geometric attributes is suitable for the life of a bridge, as the sections do not change, whereas several material attributes may be needed to represent the in-construction, short term, and long term cases.
Bridge deck temperature profile loading can be defined for the following design codes.
Bridge deck shrinkage profile loading currently supports:
For general use, a temperature/strain profile loading can be defined by stating the temperature of the top of the section followed by defining a series of segment thicknesses and corresponding values for the specific height at which the expression is being evaluated. Segment thicknesses and temperature/strain may be stated as a single value, or as expressions, making it possible to replicate expressions in bridge industry Codes of Practice and define code-specific profiles that are not currently supported elsewhere in LUSAS.
Defined profiles can be visualised for a stated visualisation height. The same profile may be assigned to multiple geometric sections of differing heights.
Direct Method Influences can now be generated from beam/shell slice resultant locations and at inspection locations. Direct Method Influence attributes can be assigned to pre-defined Inspection locations, or to Beam/Shell Slices using the 'Assign to' context menu item for the DMI attribute, and then selecting the inspection points or beam/shell slices to which the assignment should be made on the Influence Assignment dialog that subsequently appears.
The ability to assign DMI attributes to Beam/Shell Slices now makes it possible to use the Vehicle Load optimisation facility on bridge decks idealised using mixed beam and shell elements.
An orientation cube can now be optionally displayed in each model view window. This provides visual feedback on the orientation of a model, and rotates and updates as the model is rotated or orientated. The top of the cube is aligned to the defined vertical axis for the model.
The orientation cube has labelled faces with default names of Left, Right, Bottom, Top, Back and Front, and edges and corners that highlight when a cursor is moved over them. Selecting a face, edge or corner of the cube will orientate the model to be viewed from the selected direction. The model can also be dynamically rotated by clicking and dragging to rotate the orientation cube.
Home, Dynamic Rotation, Resize, and Perspective buttons can be optionally added beneath the axis cube for easy selection.
Analysis branches may be added to the Analyses Treeview by selecting the New > Branch context menu item for any loadcase in the Analyses Treeview that has (or inherits) a nonlinear or transient control. They allow the creation and solution of one or more sub-analyses to investigate the response of the model at a particular loadcase or "stage".
Examples of use include:
Any number of sub-analyses may be defined for a single parent loadcase.
See how to use the branched analysis facility to set-up and carry out buckling, stability and other what-if checks for chosen construction stages, or to consider an alternative construction sequence.
The Fast Multi-frontal solver is now made available by default to new clients.
Two Solver-related radio buttons previously included at the bottom of the 'Model properties' dialog have been replaced with a droplist control on the dialog that additionally allows specifying solution options on the 'Solve Now' dialog. These now allow for solving by the fastest available and appropriate solver for the task in hand, or the frontal solver, which provides more error diagnostics should issues arise. An option to only solve for the first loadcase (for quick model attribute assignment checking purposes) is also included.
Direct Method Influence analysis is now faster because the Solver results file is now generated at the same time as the stress recovery stage, saving significant processing time.
Larger Direct Method Influence analyses can now be carried out with either a finer grid or a finer mesh without manually setting any additional parameters. The analysis is split into batches that make maximum utilisation of the memory available but which ensure that no matter how large the DMI analysis, it will solve successfully.
The LUSAS Rail Track Analysis software option now includes the following new features / enhancements:
Once defined, slice sections are now visualised immediately on the model without the need for a solve to have taken place first.
Averaging of element results across discontinuities has been made more efficient, reducing the time it takes to display averaged results in this situation.