Dynamic Analysis Of Multi Layered Pavement Systems Under Moving Arbitrary Loads

Author : Luo, Xi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (951 download)

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Download or read book Dynamic Response of Overlay Pavement Due to Moving Load written by Luo, Xi and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A full-scale accelerated pavement test on unbonded concrete overlays was conducted in 2006 to 2009, sponsored by the IPRF (Innovative Pavement Research Foundation), and performed at the Federal Aviation Administration (FAA) National Airfield Pavement Test Facility (NAPTF). Extensive strain gage data was collected by embedded strain gages both in the overlay and the underlay, due to tridem dual and tandem dual axle loads in a controlled distribution of wander paths. It provided new data and information, which has been used in this work to develop a concrete overlay pavement model in a manner that was not done before. A semi-analytical model was conducted in this thesis to simulate dynamic behavior, specifically designed for airfield concrete overlay pavements, with consideration of multi-axle moving loads. Within the concrete overlay pavement model, interface condition is important to define. The interface conditions, from fully bonded to fully unbonded conditions, have a significant influence on dynamic responses of the pavement system, especially for the overlay and the underlay, and may also affect the corresponding performance and serviceability of pavement. . By using Ks, the shear reaction modulus, the interlayer could be seen virtually with its function remaining such that its shear stress could be obtained by multiplying Ks by relative displacement between overlay and underlay. All the bonding conditions could be described by relative displacement; when there is no relative displacement, the shear stress between the overlay and the underlay is also zero, which represents the unbonded condition. The fully bonded condition and partially bonded condition have similar mechanism. Characterization of load is another important factor affecting dynamic responses, so the loads were simulated as uniform constant pressure and harmonic load, respectively. In addition, the viscosity property of pavement layers below the underlay was considered in the model. Governing equations were compiled for overlay and underlay from equilibrium relations. To get an analytical solution, Fourier Transform was performed. The closed-form of Inverse Fourier Transform seldom works out for complex kernel functions. Alternatively, one of the numerical methods, self-adaptive numerical integration algorithm, was tried and successfully worked for the final result, and reached agreement with examples in the literature. Then the model was verified with embedded strain gage data, after parameter study of Ks, harmonic load frequency and viscosity, and strain calculated by the model showed characteristics of strain history very clearly. The analytical model is effective and with good performance, which is much faster than numerical modeling. However, the particular analytical model in this thesis can only fit for a pavement system whose geometric shape is infinite plates. The fundamental approach is always appropriate; other constitutive models could be considered for further study, such as elasticity solutions under circular loaded area, rectangular loaded area, or strip loaded area.