Volume 3, Issue 8 (September 2006)
Effect of Dynamic Aircraft Gear Loads on Asphalt Concrete Strain Responses
Asphalt strain gauges were installed in both the longitudinal and transverse directions at the Federal Aviation Administration's National Airport Pavement Test Facility (NAPTF) to measure the load-induced Asphalt Concrete (AC) tensile strains during full-scale traffic testing with a dual-tridem Boeing 777 gear configuration and a dual-tandem Boeing 747 gear configuration. The results are presented for four flexible test sections; two sections with 127 mm of AC and two with 254 mm of AC. An axisymmetric finite element pavement analysis software was used to model the NAPTF flexible test sections and compute the AC strain responses. The measured AC strain magnitudes were significantly influenced by AC temperature variations. Dramatic increase in peak strain responses were observed as the NAPTF flexible test sections approached structural failure. There was a good agreement between the field-measured and computed strains during the early life of the test sections.