ECE 416_Lecture 4_Traffic MEPDG - LECTURE 4 TRAFFIC INPUTS TO MEPDG PROCEDURE CHANG-SEON SHON PH.D ASSISTANT PROFESSOR DEPARTMENT OF CIVIL ENGINEERING

ECE 416_Lecture 4_Traffic MEPDG - LECTURE 4 TRAFFIC INPUTS...

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1Lecture 04ECE 416: Transportation Engineering1CHANG-SEONSHON, PH.D., ASSISTANTPROFESSORDEPARTMENT OFCIVILENGINEERINGNAZARBAYEVUNIVERSITY2015 FALLLECTURE4TRAFFICINPUTS TOMEPDG PROCEDURELecture 04ECE 416: Transportation Engineering2DesignConsiderationsMaterialsDesignProceduresAdditionalTopicsPerformance IndicatorsTraffic Inputsby AASHTO 1993Traffic Inputsby MEPDGSubgrade & Unbound MaterialsRigid Pavement: PCC MaterialsFlexible Pavement: HMA MaterialsFlexible Pavement Designby AASHTO 1993Flexible Pavement Designby MEPDGRigid Pavement Designby AASHTO 1993Rigid Pavement Designby MEPDGPavement Design ReliabilityLife Cycle Cost Analysis/Perpetual PavementDrainage/Tire Noise/Surface FrictionGeometric Design of Highway2
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2Lecture 04ECE 416: Transportation Engineering3BE ABLE TO RECOGNIZE THE DIFFERENCES BETWEEN TRAFFICINPUTS FOR THEMEPDG VS. THOSE FOR THE1993 PROCEDUREBE ABLE TO IDENTIFY VARIOUS TRUCK TYPES, AXLE TYPES, ANDTIRE TYPES USED IN PAVEMENT DESIGN PROCEDURESLEARNINGOBJECTIVESLecture 04ECE 416: Transportation Engineering4PAVEMENT PERFORMANCETRAFFICROADBED SOILS(SUBGRADE MATERIALS)MATERIALS OF CONSTRUCTIONENVIRONMENTDRAINAGE CHARACTERIZATIONRELIABILITY(CONFIDENCE LEVEL)INFORMATIONNEEDED FORPAVEMENTDESIGN
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3Lecture 04ECE 416: Transportation Engineering5ROADWAYTRAFFICMIXLecture 04ECE 416: Transportation Engineering6MOST COMMON DESIGN METHODS(e.g., AASHTO 1993 ANDTXDOTMETHODS): TOTAL NUMBER OFESAL PASSES IN THEDESIGN LANE THROUGHOUT THE DESIGN LIFEMEPDG: NUMBER OF AXLE PASSES FOR EACH WHEEL LOADCATEGORY OF EACH AXLE TYPE IN THE DESIGN LANE DURINGEACH TIME INCREMENT OF THE DESIGN LIFEMEPDG TRAFFICTIMEINCREMENTS:Hourly, day/night, and monthly time incrementsFor simplicity, we will discuss monthly increments onlyTRAFFICINPUT TOPAVEMENTDESIGNPROCEDURES
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4Lecture 04ECE 416: Transportation Engineering7CHANGES INMEPDG INPUTSDURINGDESIGNLIFEMEPDG RECOGNIZES THAT DESIGN PARAMETERS(INCLUDINGTRAFFIC) CHANGE OVER TIMETime, yearsTrafficPCC ModulusGranular Base ModulusTime Increment28640SubgradeModulusAC ModulusLecture 04ECE 416: Transportation Engineering8TRAFFIC MIX IS GROUPED BY:Vehicle type (FHWA Vehicle Classes 4-13)Axle typeAxle load (called weight spectra)OTHERTRAFFICINPUTS TOMEPDG Tire inflation pressureTire width and dual spacingAxle spacingTruck lateral distribution factorVehicle operational speedCHARACTERIZATION OFTRAFFIC INMEPDG
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5Lecture 04ECE 416: Transportation Engineering9TRAFFICLOADAPPLICATIONS INMEPDGLecture 04ECE 416: Transportation Engineering10MEPDG TRUCKCLASSES
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6Lecture 04ECE 416: Transportation Engineering11MEPDG AXLETYPES& LOADGROUPSSINGLE AXLES: 3,000 LB TO41,000 LB, DIVIDED AT1,000-LBINTERVALSTANDEM AXLES: 6,000 LB TO82,000 LB, DIVIDED AT2,000-LBINTERVALSTRIDEM& QUAD AXLES: 12,000 LB TO102,000 LB, DIVIDEDAT3,000-LB INTERVALS
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