Layered Elastic Theory (LET) Design Tool

Rubicon Toolbox incorporates several tools that utilize the layered elastic theory (LET) model for pavement response calculation. The LET: Standard Axle Analysis tool allows users to evaluate the structural capacity of a pavement structure in terms of a user-defined standard axle. A key feature of the Standard Axle Analysis Tool is that it allows designers to evaluate multiple phases of pavement structural life in a single calculation. In this manner, complex behaviour patterns such as breakdown of cemented layers into granular materials, deterioration of bituminous materials etc. can be easily modelled and evaluated. The multi-phase model can also be used to evaluate multi-stage construction projects. All calculations are shown in a transparent manner in a neat report which explicitly summarizes all assumptions and calculation results. Detailed results can also be exported to Microsoft Excel.

The Standard Axle Analysis Tool incorporates two main calculation modes. These are: (a) Distinct Phase calculation without adjustment for damage, and (b) Multiple Phase calculation with incremental adjustment of layer stiffnesses. In Multiple-Phase mode, layer stiffnesses are incrementally adjusted to take account of damage within the pavement layers. Layers can change phase (e.g. move from the Cementitious to a unbound material), or be replaced (e.g. through mill-and-place operations).

A key feature of most Rubicon Toolbox Pavement Design Tools, including the LET: Standard Axle Analysis Tool, is that Failure Criteria (Transfer Functions) are fully customizable. By selecting from one of the more than fifteen equation forms, users can customize their own criteria. Criteria can also be grouped into classes, or "views", where each view can effectively comprise a different design method. This functionality makes Rubicon Toolbox ideal for implementation in an International context.

Key Features

• All Layered Elastic Theory (LET) modules utilize the fast and well-validated WESLEA multi-layer elastic module for stress and strain calculations;
• Implements User-Defined Failure Criteria (or Transfer Functions) that can be predefined and used across projects;
• Multiple phases can be evaluated in one calculation, allowing the modelling of complex material behaviour patterns and multi-stage construction. Select between a Distinct Phase or Multi-Phase incremental-recursive damage model;
• Material Types can be predefined and used across projects. Material type definitions include all required properties for most existing failure criteria types, including the latest criteria for Foamed Bitumen and Emulsion Treated materials;
• Load configurations of up to eight loads can be predefined and used across projects;
• Damage accumulated in different stages of pavement life can be analyzed in detail and exported to Microsoft Excel;
• Neat and concise reports can be printed directly or can be exported in electronic format using simple copy and paste operations;
• Allows customization of Engineering Units to display on reports and on screen;
• Backed by MAS's efficient and personalized customer support.

Pricing

Please see our Price List for details.

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Last modified: 04/08/08