Eng. & Tech. Journal, Vol.28, No.17, 2010 * Engineering College, University of Al -Mustansirya/ Baghdad 5568 Damaging Effect of Armoured Vehicles with Rubber Tires on Flexible Pavement Dr. Saud A. Sultan* Received on: 25/ 2 / 2009 Accepted on: 6/5/2010 Abstract Presented in this paper is a new study of the damaging effect of military armoured vehicles with rubber tires on flexible pavements. Two types of military armoured vehicles with rubber tires were studied, namely LAV-AT four-axle and LAV-300 triple-axle. A measure of the damaging effect of military armoured vehicles with rubber tires loads was achieved by correlating their equivalent loads with the AASHTO equivalency factors. The equivalent load was developed on the basis of mechanistic - empirical approach. It was found that the damaging effect of the studied military armoured vehicles with rubber tires loads is 0. 0.200 to 4.736 times the damaging effect of the standard 18 kips (80 kN) axle load depending on the thickness of asphalt layer. Keywords: military armoured vehicles, four-axle, triple-axle AASHTO equivalency factors, flexible pavements, and damaging effect. ﺍﻟ ﺘﺄﺜﻴﺭ ﻷ ﺍﻟﺘﺨﺭﻴﺒﻲ ﺃﻟ ﺤﻤﺎل ﺍﻟﻤﻁﺎﻁﻴﺔ ﺍﻹﻁﺎﺭﺍﺕ ﺫﺍﺕ ﺍﻟﻤﺩﺭﻋﺔ ﻌﺠﻼﺕ ﺍﻟﺘﺒﻠﻴﻁ ﻋﻠﻰ ﺃﻹﺴﻔﻠﺘﻲ ﺍﻟﺨﻼﺼﺔ ﺭﺒﺎﻋﻴﺔ ﺍﻟﻤﻁﺎﻁﻴﺔ ﺍﻹﻁﺎﺭﺍﺕ ﺫﺍﺕ ﺍﻟﻤﺩﺭﻋﺔ ﺃﻟﻌﺠﻼﺕ ﻷﺤﻤﺎل ﺍﻟﺘﺨﺭﻴﺒﻲ ﻟﻠﺘﺄﺜﻴﺭ ﺠﺩﻴﺩﺓ ﺩﺭﺍﺴﺔ ﻤﻌﺎﻤﻼﺕ ﺃﺒﺠﺎﺩ ﺨﻼل ﻤﻥ ﺍﻹﺴﻔﻠﺘﻲ ﺍﻟﺘﺒﻠﻴﻁ ﻋﻠﻰ ﺍﻟﻤﺤﺎﻭﺭ ﻭﺜﻼﺜﻴﺔ ﻤـﺭﺓ ﻭﻷﻭل ﻟﻬﺎ ﺍﻟﻤﻜﺎﻓﺌﺔ ﺁﺸﺘﻭ ﺍﻟﻤﻴﻜﺎﻨﻴﻜﻲ ﺍﻟﺤل ﻁﺭﻴﻘﺔ ﻭﺒﺎﺴﺘﺨﺩﺍﻡ– ﺍﻟﺘﺠﺭﻴﺒﻲ. ﻷﺤﻤـﺎل ﺍﻟﺘﺨﺭﻴﺒـﻲ ﺍﻷﺤﻤﺎل ﺘﺄﺜﻴﺭ ﺇﻥ ﻭﺠﺩ ﻟﻘﺩ ﻤﻥ ﻴﺘﺭﺍﻭﺡ ﺩﺭﺍﺴﺘﻬﺎ ﺘﻤﺕ ﺍﻟﺘﻲ ﺍﻟﻤﻁﺎﻁﻴﺔ ﺍﻹﻁﺎﺭﺍﺕ ﺫﺍﺕ ﺍﻟﻤﺩﺭﻋﺔ ﺃﻟﻌﺠﻼﺕ0.200 ﺇﻟﻰ4.736 ﻤﺭﺓ ﺍﻹﺴﻔﻠﺕ ﻁﺒﻘﺔ ﺴﻤﻙ ﺤﺴﺏ ﺍﻟﻘﻴﺎﺴﻲ ﺁﺸﺘﻭ ﺤﻤل ﺘﺄﺜﻴﺭ. 1. Introduction Determining the pavement life under given structural, environmental, and traffic conditions is considered the main objective in the pavement design and analysis. The American Association of State Highway and Transportation Officials (AASHTO) Design Guide estimates pavement life in terms of the number of equivalent single axle loads (ESAL's). Its design equation was established through empirical analysis primarily based on the AASHO Road Test in Ottawa, Illinois conducted during the late 1950s. The deterioration of a roadway is accelerated over time by the repeated application of loads generated by heavy vehicles. Consequently projected maintenance and preservation costs increase. Pavement deterioration is further intensified by an incentive for overweight trucks PDF created with pdfFactory Pro trial version www.pdffactory.com