Application of semi-analytical finite element method to analyze the bearing capacity of asphalt pavements under moving loads

doi:10.1007/s11709-017-0401-2

Front. Struct. Civ. Eng.

2018, Vol. 12

Issue (2) : 215-221 https://doi.org/10.1007/s11709-017-0401-2

RESEARCH ARTICLE

Application of semi-analytical finite element method to analyze the bearing capacity of asphalt pavements under moving loads

Pengfei LIU(

), Dawei WANG, Frédéric OTTO, Markus OESER

Institute of Highway Engineering, RWTH Aachen University, Aachen D52074, Germany

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Abstract

To facilitate long term infrastructure asset management systems, it is necessary to determine the bearing capacity of pavements. Currently it is common to conduct such measurements in a stationary manner, however the evaluation with stationary loading does not correspond to reality a tendency towards continuous and high speed measurements in recent years can be observed. The computational program SAFEM was developed with the objective of evaluating the dynamic response of asphalt under moving loads and is based on a semi-analytic element method. In this research project SAFEM is compared to commercial finite element software ABAQUS and field measurements to verify the computational accuracy. The computational accuracy of SAFEM was found to be high enough to be viable whilst boasting a computational time far shorter than ABAQUS. Thus, SAFEM appears to be a feasible approach to determine the dynamic response of pavements under dynamic loads and is a useful tool for infrastructure administrations to analyze the pavement bearing capacity.

Keywords semi-analytical finite element method bearing capacity asphalt pavements moving loads dynamic response

Corresponding Author(s): Pengfei LIU

Online First Date: 12 June 2017 Issue Date: 23 April 2018

Cite this article:

Pengfei LIU,Dawei WANG,Frédéric OTTO, et al. Application of semi-analytical finite element method to analyze the bearing capacity of asphalt pavements under moving loads[J]. Front. Struct. Civ. Eng., 2018, 12(2): 215-221.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-017-0401-2
https://academic.hep.com.cn/fsce/EN/Y2018/V12/I2/215

Fig.1 Pavement structure geometry and load mode [¹³]

Fig.2 Schematic illustration of loading conditions in SAFEM [¹²]

Fig.3 (a) The test track at BASt [¹⁸–²⁰]; (b) top view with loading wheel path.

Tab.1 material properties and thickness of pavement layers.

Fig.4 Geometric data and tires of the truck S23 [¹⁷]

Fig.5 Automatic mesh generation for the test track (a) SAFEM; (b) ABAQUS

Fig.6 The schematic illustration of simulation process with the moving load in ABAQUS (a) Step time= 0, increment=0; (b) Step time= 0.3024?s, increment=105; (c) Step time= 0.59904?s, increment=208; (d) Loading area when the step time is 0.3024?s

Fig.7 Surface deflections from ABAQUS and SAFEM

Tab.2 Comparison of results from field measurements, ABAQUS and SAFEM regarding the strains and stresses at critical points.

Tab.3 Comparison between ABAQUS and SAFEM regarding elements, nodes and computational time.

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