CVE 656-COMPUTER APPLICATIONS IN CIVIL ENGINEERING -Seminar

An Overview…CIRCLY-Powerful and user-friendly 􀁺 CIRCLY 5.0 is a major step forward in pavement design: -a fully integrated system with superior design power and ease of use􀁺 CIRCLY 5.0 draws on the proven technology of earlier versions of CIRCLY software [used on thousands of pavement designs over 20 years] 􀁺 Our system introduces a number of powerful new features: – enormous input data flexibility – extensive data-base saving re-entry of frequently used data – new parameters easily defined the best of the old and the new...all important design inputs: TRAFFIC – any combination of vehicle types or load configurations – any wheel layout – braking or vertical loads – varying contact stress distributions MATERIALS – any damage model – isotropic or anisotropicAny traffic spectrum can be analysed…A typical input screen: The traffic details These vehicle details are simply called up from the CIRCLY vehicle databaseA typical input screen: The traffic details You enter traffic count hereA typical input screen: The traffic details New vehicles and load cases are easily addedThe pavement system... CIRCLY realistically models pavement response: 􀁺any combination of layer thicknesses and elastic properties 􀁺state of the art damage indicators200 110 150 150 150 150 Subgrade Base Course/Subbase Course Modulus 2800 600 600 480 240 120 150 60 30 Poisson's Ratio 0.4 0.35 0.35 0.35 0.35 0.35 0.35 0.45 Thickness (mm) (MPa) Infinite Asphalt CBR = 3 Typical layered pavement model 􀀹 anisotropic properties can be used􀂄 A damage model relates pavement life to an indicator of damage such as subgrade compressive strain, etc. 􀂄 The models are of the form: where N is the predicted life (repetitions to failure) k is a material constant b is the damage exponent ε is the induced strain How damage models are defined N k b = FH IKεYou can choose damage indicators Subgrade Base Course/Subbase Course Asphalt CBR = 15 Tensile strain Example:Subgrade Base Course/Subbase Course Asphalt CBR = 15 Vertical strain Example: You can choose damage indicators􀁺 you can define new models 􀁺 models can use any deflection, strain or stress component, e.g.: CIRCLY handles all damage models maximum shear strain tensile principal strain vertical compressive strain octohedral shear strainCIRCLY gives fast results: 􀁺 Once parameters are defined, typical runs take only seconds on Pentium PCs 􀁺 Even the most complex combinations of vehicles and the most complicated pavement structures take seconds, not hours! Here is the thickness determined for this example The criterion used is for CDF=1.0 This analysis takes a second on a Pentium Automatic Thickness DesignResults presentation 0.00E+00 2.00E-01 4.00E-01 6.00E-01 8.00E-01 1.00E+00 1.20E+00 1.40E+00 1.60E+00 1.80E+00 0.00E+00 5.00E+01 1.00E+02 1.50E+02 2.00E+02 2.50E+02 3.00E+02 3.50E+02 Distance from Centreline Damage ESA TA/DW Total high quality plots can be output on any printerany deflection, strain or stress component, e.g. surface displacements Results presentationVertical strain any deflection, strain or stress component, e.g. strain pulse under dual wheels Results presentationVertical strain any deflection, strain or stress component, e.g. strain pulse under dual wheels Results presentationNew features in CIRCLY 5.0…􀁺 Full Support for Austroads 2004 Pavement Design Guide 􀁺 Cost Calculation 􀁺 Parametric Analysis – for cost optimisation 􀁺 Fast Built-in Graphics Engine New features in CIRCLY 5.0…Support for Austroads 2004 Guide 􀁺 Project Reliability 􀁺 New Sub-Layering Method for Unbound Granular Materials 􀁺 Select Fill Subgrade Materials 􀁺 Example JobsCost Calculation Total CostCost Calculation Entry of Unit Material CostsAutomatic Parametric Analysis 􀁺 Automatically loop through one or two thickness ranges 􀁺 Simultaneously design the thickness of another layer 􀁺 Lets you fine-tune layer thicknesses to minimize construction and maintenance costsCost Optimization Example Asphalt: Size 14, Type H Asphalt: Size 20, Type T Crushed Rock: 20 mm , Class 4 Subgrade, CBR = 3 Thickness T1 = 40 mm T2 = ? T3 = ? Unit Cost $288 /m3 $288 /m3 $50 /m3Summary of Results 79.9 81.4 86.2 94.8 112.0 151.7 Total Cost ($/m2) 0.89 100 (min.) 220 1.0 189 210 1.0 343 200 1.0 573 190 1.0 973 180 1.0 1826 170 Max. CDF Layer 3 Thickness Layer 2 Thickness Minimum Cost Cost Optimization ExampleAutomatically generated plot: Total Cost vs. Layer 2 Thickness Minimum Total Cost How it works…. Cost Optimization ExampleIn summary......A complete design system..... 􀁺 models actual traffic spectrum 􀁺 models all design vehicle loads 􀁺 uses multi-layered pavement 􀁺 predicts pavement life with userdeffine state-of-the-art damage modelsCIRCLY -easy to use..... 􀁺 complete integrated system 􀁺 runs on IBM-compatible PCs 􀁺 rapid analysis 􀁺 ready-to-use databases for vehicle loading, pavement composition and damage models 􀁺 new parameters easily defined 􀁺 quality hard copies of results on any printer or plotterTechnical Support 􀁺 Comprehensive 86 page User Manual includes worked examples 􀁺 Users are notified of updates 􀁺 Latest version can be downloaded from websiteFor further information contact: MINCAD Systems Pty. Ltd. P.O. Box 2114, Richmond South, Vic. 3121 Australia Telephone: Intl. +613 9427 1085 Facsimile: Intl. +613 9428 1197 E-mail: mincad@mincad.com.au web: www.mincad.com.au