Abstract
Shakedown analysis is an attractive method for determining the capacity of geostructures to sustain repeated loads involving a large number of cycles, e.g. rolling and sliding train wheel loads. Its main advantage is that it comes at a significantly reduced computational cost, compared to standard time-domain analyses. An essential component of shakedown analysis is the derivation of closed-form solutions to compute stresses due to the external repeated loads, a task that is not always feasible for complex problems as the ballasted rail track discussed herein. To tackle this, we present in this paper the use of finite element tools to obtain a quasi-lower-bound shakedown load numerically. The proposed method is based on the computation of the three-dimensional elastic stress field numerically, and the estimation of the shakedown load iteratively via an optimisation subroutine implemented in ABAQUS. Following a short presentation of this concept, we compare the elastic stress fields from models featuring varying degree of complexity, with the aim of identifying an optimal discretisation of the problem. This approach can be used for optimising the design of ballasted track structure, and this concept is briefly presented via a parametric study.
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Acknowledgements
The financial support of National Key R&D Program of China (No. 2016YFC0800200), the financial support sponsored by Qing Lan Project, A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (Grant No. 1105007138), the Open Fund of National Engineering Laboratory of Highway Maintenance Technology (No. kfj180106, Changsha University of Science and Technology), and the Fundamental Research Funds for the Central Universities (Grant No. 2242018K40133) is acknowledged. The first author would like to acknowledge the support from China Scholarship Council and the support provided to him by the ARC Centre of Excellence for Geotechnical Science and Engineering at The University of Newcastle, NSW Australia.
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Wang, K., Zhuang, Y., Kouretzis, G. et al. Shakedown analysis of ballasted track structure using three-dimensional finite element techniques. Acta Geotech. 15, 1231–1241 (2020). https://doi.org/10.1007/s11440-019-00818-6
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DOI: https://doi.org/10.1007/s11440-019-00818-6