CIVE 319 Lecture Notes - Lecture 13: Axle Load, American Association Of State Highway And Transportation Officials, Modulus Guitars
15 Apr 2019
School
Department
Course
Professor
Document Summary
Chapter 8 - introduction to pavement design (continued) (chap 4 in textbook) Aashto guide for design of pavement structures. By american association of state highway and transportation officials. First publication in 1972 and latest revised in 1993 (1986 version) Data from aasho road test in illinois (1958-1960) Large range of vehicle axle types and loads w 18. Purpose determine the impact of any axle load on the pavement in term of esal"s. Ex: 44-kip tandem-axle is equal to 2. 88 the impact of a 18-kip single axle load. W 18 standard 18-kip equivalent single axle load (esal) 44-kip = 2. 88 w 18 where 2. 88 is the equivalency factor. Either use the equation or the table to determine w 18. Z r reliability (z-statistic from standard normal curve) S o overall standard deviation of traffic. Psi loss in serviceability from installation to tsi. M r soil resilient modulus of subgrade (lb/in 2 ) Tables 4. 1, 4. 2 & 4. 3 depending on axle type.
