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Transformed Field Domain Analysis of Pavements Subjected to Moving Dynamic Tandem-Axle Loads and Integrating Their Effects into the CRCP-10 Computer Program
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2001-08-01
[PDF-886.78 KB]
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Edition:(9/00-8/01)
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Abstract:The dynamic displacement and stress responses of rigid and flexible pavements subjected to moving tandem-axle loads of constant amplitude and harmonic and arbitrary variations have been investigated. The pavement systems have been modeled using a plate of infinite extent on a viscoelastic foundation. Formulations have been developed in the transformed field domain using: (1) a double Fourier transform in space and moving space for moving loads of constant amplitude; (2) a triple Fourier transform in time, space, and moving space for moving loads of arbitrary variation; and (3) a double Fourier transform in space and moving space for the steady-state response to moving harmonic loads. The effects of viscous damping, vehicle speed, load frequency, and phase between front- and rear-axle loads have been investigated. The analysis results considering viscoelasticity show significant differences from those obtained with an elastic system. The pavement surface roughness causes dynamic variations in the load amplitude, and the maximum deflection and stress can significantly increase accordingly. The variation in the load amplitude and the differences in the phase angles between front- and rear-axle loads can make the maximum deflection and stress considerably larger. The use of tandem axle loads is necessary to find the accurate responses because the phase effect cannot be considered with single-axle loads. The formulations developed to find the wheel load stresses resulting from the moving tandem-axle loads have been integrated into CRCP-10, which is the updated computer program of CRCP-9.
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