CEE 462 Quiz 2
Material Covered: Weeks 3 & 4 (Lecture 3 & 4), Fall 2021
Date:____________________
Name:____________________________ UIN _____________
Please read each of the questions carefully before choosing your answer.
Question 1. (15 marks) Determine the Equivalent Single Axle Load for design life (25 years) using
following conditions. In order to get a full point, please show all
calculation works.
Given condition:
• 6-lane rural interstate highway
• Forecast 12,000 AADT each direction
• 8% of traffic-2 axle truck (6,000 lbs/axle)
• 10% of traffic: 3 axle truck (12,000 lbs/axle)
• 60% of traffic in the design lane
• 40% of directional distribution factor
• Design life: 25 years
• Growth year: 4% per year
• Structure number: 5
• ∆PSI of 2.3 and initial PSI of 4.8
• When you choose lane distribution factor, please
use the lowest value in the range.
Keys
