A northbound direction on an interstate highway consists of three lanesof flexible pavement. The subgrade CBR is 4.5, the overall standarddeviation is 0.38, and the reliability is 95%. The initial PSI is 4.5 and thefinal PSI is 2.5. Daily total northbound road traffic consists of 39,500 cars(each with two 2kip single axles), 775 buses ((each with two 19 kip singleaxles) and 1100 heavy trucks (each with two 10kip single axle and two34kip tandem axles). If the pavement is designed to last for 20 years,what should be its structural number?

Given. CBR=4.5 Standard deviation =0.38 Reliability=95% Initial PSI =4.5 Final PSI =2.5

A northbound direction on an interstate highway consists of three lanes of flexible pavement. The subgrade CBR is 4.5, the overall standard deviation is 0.38, and the reliability is 95%. The initial PSI is 4.5 and the final PSI is 2.5. Daily total northbound road traffic consists of 39,500 car (each with two 2kip single axles), 775 buses ((each with two 19 kip single axles) and 1100 heavy trucks (each with two 10kip single axle and two 34kip tandem axles). If the pavement is designed to last for 20 years, what should be its structural number?

A northbound direction on an interstate highway consists of three lanes of flexible pavement. The subgrade CBR is 4.5, the overall standard deviation is 0.38, and the reliability is 95%. The initial PSI is 4.5 and the final PSI is 2.5. Daily total northbound road traffic consists of 39,500 car (each with two 2kip single axles), 775 buses ((each with two 19 kip single axles) and 1100 heavy trucks (each with two 10kip single axle and two 34kip tandem axles). If the pavement is designed to last for 20 years, what should be its structural number?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Pavement Management

Pavement management is the process of planning the maintenance and repair of a roadway network or other paved infrastructure to improve road conditions throughout the network. It is also used on runways and airports. Every highway superintendent undertakes walkway management. Traffic management includes the cost of living cycles in a systematic way of repairing minor and major roads and reconstruction projects. The needs of the entire network and budget estimates are considered before the projects are undertaken, as the cost of data collection can change significantly. Pavement management incorporates many of the features and functions required to maintain the quality of the paved material as well as to ensure that the entire road network can sustain itself at the required levels. Although pedestrian management involves the life cycle of commuting from planning to maintenance of any transport infrastructure, road asset management, and road maintenance planning is primarily aimed at road infrastructure.

Question

A northbound direction on an interstate highway consists of three lanes
of flexible pavement. The subgrade CBR is 4.5, the overall standard
deviation is 0.38, and the reliability is 95%. The initial PSI is 4.5 and the
final PSI is 2.5. Daily total northbound road traffic consists of 39,500 cars
(each with two 2kip single axles), 775 buses ((each with two 19 kip single
axles) and 1100 heavy trucks (each with two 10kip single axle and two
34kip tandem axles). If the pavement is designed to last for 20 years,
what should be its structural number?

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