ECE 416_Lecture 3_Traffic 93 - LECTURE 3 TRAFFIC INPUTS TO AASHTO 1993 PROCEDURE CHANG-SEON SHON PH.D ASSISTANT PROFESSOR DEPARTMENT OF CIVIL

ECE 416_Lecture 3_Traffic 93 - LECTURE 3 TRAFFIC INPUTS TO...

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1 Lecture 03 ECE 416: Transportation Engineering 1 C HANG -S EON S HON , P H .D., A SSISTANT P ROFESSOR D EPARTMENT OF C IVIL E NGINEERING N AZARBAYEV U NIVERSITY 2015 F ALL L ECTURE 3 T RAFFIC I NPUTS TO AASHTO 1993 P ROCEDURE Lecture 03 ECE 416: Transportation Engineering 2 Design Considerations Materials Design Procedures Additional Topics Performance Indicators Traffic Inputs by AASHTO 1993 Traffic Inputs by MEPDG Subgrade & Unbound Materials Rigid Pavement: PCC Materials Flexible Pavement: HMA Materials Flexible Pavement Design by AASHTO 1993 Flexible Pavement Design by MEPDG Rigid Pavement Design by AASHTO 1993 Rigid Pavement Design by MEPDG Pavement Design Reliability Life Cycle Cost Analysis/Perpetual Pavement Drainage/Tire Noise/Surface Friction Geometric Design of Highway 2
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2 Lecture 03 ECE 416: Transportation Engineering 3 B E ABLE TO RECOGNIZE THE DIFFERENCES BETWEEN TRAFFIC INPUTS FOR THE MEPDG VS . THOSE FOR THE 1993 PROCEDURE B E ABLE TO IDENTIFY VARIOUS TRUCK TYPES , AXLE TYPES , AND TIRE TYPES USED IN PAVEMENT DESIGN PROCEDURES B E ABLE TO UNDERSTAND AND DESCRIBE THE CONCEPT OF EQUIVALENT SINGLE AXLE LOAD (ESAL) B E ABLE TO UNDERSTAND AND DESCRIBE THE CONCEPT OF LOAD EQUIVALENCY FACTORS (LEF) B E ABLE TO COMPUTE DESIGN ESAL ( AN INPUT TO THE 1993 DESIGN PROCEDURE ) L EARNING O BJECTIVES Lecture 03 ECE 416: Transportation Engineering 4 P AVEMENT PERFORMANCE T RAFFIC LOADS R OADBED SOILS ( SUBGRADE MATERIALS ) M ATERIALS OF CONSTRUCTION D RAINAGE CHARACTERIZATION R ELIABILITY (C ONFIDENCE LEVEL ) E NVIRONMENT I NFORMATION N EEDED FOR P AVEMENT D ESIGN
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3 Lecture 03 ECE 416: Transportation Engineering 5 R OADWAY T RAFFIC M IX Lecture 03 ECE 416: Transportation Engineering 6 T YPES OF T RUCK A XLES AND T IRES
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4 Lecture 03 ECE 416: Transportation Engineering 7 FHWA V EHICLE C LASSES 7 Lecture 03 ECE 416: Transportation Engineering 8 1993 D ESIGN M ETHOD : N UMBER OF PASSES OF STANDARD 18,000 LB (80 K N) EQUIVALENT SINGLE AXLE LOADS (ESAL S ). T HE ACTUAL TRAFFIC MIX NEEDS TO BE CONVERTED INTO ESAL S . MEPDG M ETHOD : A CTUAL NUMBER OF PASSES ( WITHIN EACH TIME INCREMENT ), BROKEN BY : Vehicle type (FHWA Vehicle Classes 4-13) Axle type Axle load [called weight (load) spectra] T RAFFIC I NPUTS
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5 Lecture 03 ECE 416: Transportation Engineering 9 O THER T RAFFIC I NPUTS TO MEPDG Tire inflation pressure Tire width and dual spacing Axle spacing Truck lateral distribution factor Vehicle operational speed T RAFFIC I NPUTS (C ONT D ) Lecture 03 ECE 416: Transportation Engineering 10 ESAL = 18-kip (80 kN) Equivalent Single Axle Load. # of ESALs represents the damaging effect of an axle of any mass LEF = Load Equivalency Factor W 18 = Number of 18-kip single axle applications to cause a pre-defined amount of damage to a particular pavement structure W x = Number of Axle x applications to cause the same pre-defined amount of damage to the same pavement structure ESAL AND LEF 18 x W LEF W
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6 Lecture 03 ECE 416: Transportation Engineering 11 AASHO R OAD T EST T RAFFIC L OADS Lecture 03
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