Dynatest® Evaluation of Layer Moduli and Overlay Design Programme - ELMOD5 -

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ELMOD^® 5

	Elmod^® 5 forms the core module of the Dynatest suite of analytical programs.

	Optional modules: FEM / LET / MET module LCCA module PCN module The new version has retained the well known fast and user friendly back-calculation routines and has a number of improvements for graphing and reporting, with all data now being stored in a Microsoft Access database format. Enhancements have been made to many functions including data editing, batch mode, overlay design and aircraft wander.		ELMOD is an acronym for Evaluation of Layer Moduli and Overlay Design.
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	Many current methods of pavement evaluation and rehabilitation design rely almost exclusively on empirical relationships. Since empirical rules are difficult to generalise across a wide range of pavement types, loading and local environmental conditions, a primary goal for the Dynatest methodology has been to reduce the reliance on empirical approaches. Instead, pavements can be analysed like most other civil engineering structures, i.e., through the use of calculated and allowable stresses and strains at critical points within the pavement structure, under load, the relationships between allowable stresses and strains, and pavement distress, remains essentially empirical. The calculation of existing stresses and strains within the pavement structure can be accomplished through an analytical, or mechanistic approach. . ELMOD^® 5.0 forms is the core module of the Dynatest suite analytical programs. Advantages of Elmod^® 5 Reads Dynatest Edition 9.x, 10.x, 20.x, 25.x and FwdWin MDB data files. Utilises up to 15 geophones. Batch processes FWD/HWD data files. Provides extensive analytical and presentation graphing facilities. Offers a "turn-key" approach to pavement analysis. Performs backcalculation, calculates stresses and strains, and determines overlay requirements. Provides flexible user input options defining materials including transfer functions and sensitivity to climatic conditions. Can utilize point related structure information, like output from GPR testing and analysis. . Click for screen shots and more details ...		Three modules can be included with Elmod5. They can be accessed through the Elmod^® interface and function as fully integrated parts of Elmod^®: The FEM/LET/MET module, The LCCA module and The PCN module (replacing the old ACN-PCN program). The FEM/LET/MET Module The FEM (Finite Element Module) makes use of an axial symmetric finite element program. The LET (Linear Elastic Theory) option makes use of the Waterways Experiment Station's program (WESLEA), and MET is similar to the method used in ELMOD^® with improved adjustment factors. The program can be used to manually change the layer moduli (or other parameters) and compare the effect on the deflections. An automatic fitting of measured and calculated basins may also be done, either on a point-by-point basis or for all points in the FWD file. With FEM all of the layers may be treated as non-linear elastic, and with MET the subgrade may be non-linear. Both the LET and MET may determine the depth to bedrock. The program may also be used to calculate the critical stresses and strains at the layer interfaces. The LCCA module The LCCA (Life Cycle Cost Analysis) module allows the user to select the optimum rehabilitation and maintenance solution for the pavement section. The main inputs are the backcalculation results from Elmod5 and a user defined choice of rehabilitation solutions. The program performs a life cycle cost analysis for each maintenance option, and arranges the solutions according to cost/benefit ratios. LCCA makes use of incremental-recursive analysis methods that are similar to the approach of the proposed AASHTO 2002 design guide. Other performance data e like roughness, rut depth, friction and visual surveys, may be included in the modelling. The performance models and cost models are user adjustable and calibrated to specific conditions. The PCN module PCN (Pavement Classification Number) is an optional module that uses the data files from Dynatest FWD/HWD equipment to calculate ACN/PCN values based on the methods used by ICAO and FAA. The results of the Elmod^® Backcalculation process are used to calculate the PCN value. Parameters defining material properties, unrestricted traffic etc. are all user controllable.
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			Dynatest International Rev. 050630-11
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