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Indexed by:Journal Papers

Date of Publication:2020-03-01

Journal:CANADIAN JOURNAL OF CIVIL ENGINEERING

Included Journals:EI、SCIE

Volume:47

Issue:3

Page Number:317-325

ISSN No.:0315-1468

Key Words:asphalt pavement; static analysis; dynamic effect; dynamic deflection; backcalculated modulus

Abstract:This study is to evaluate the dynamic effects of falling weight deflectometer (FWD) loading on the surface deflection of asphalt pavement and the accuracy of statically backcalculated layer moduli from FWD data. The dynamic and static deflections were computed using the spectral element method and the layer elastic theory, respectively, for various pavement structures. The static deflection is considerably larger than the dynamic deflection for typical FWD loading and the normalized difference between static and dynamic deflections increases with increasing distance from the load center and decreases with increasing loading duration. The dynamic deflections were utilized to backcalculate the layer moduli using two static backcalculation procedures, MODULUS and EVERCALC. The backcalculated moduli can be significantly different from the actual moduli. The results indicate that the static backcalculation procedure can lead to significant errors in the backcalculated layer moduli by ignoring the dynamic effects of FWD loading.