Computational Analysis of Railroad Ballast Settlement

Foster, Craig; National University Rail Center (NURail); University of Illinois at Chicago. Dept. of Civil and Materials Engineering

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Computational Analysis of Railroad Ballast Settlement

2020-08-29
By Foster, Craig

[PDF-3.44 MB]

English

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Details:

Alternative Title:

Coupled Multibody and Finite Element Analysis of Rail Substructure Behavior [Project title from cover]
Creators:

Foster, Craig
Corporate Creators:

National University Rail Center (NURail) ; University of Illinois at Chicago. Dept. of Civil and Materials Engineering

National University Rail Center (NURail) ; University of Illinois at Chicago. Dept. of Civil and Materials Engineering Less -
Corporate Contributors:

United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology

United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology Less -
Subject/TRT Terms:

[+]

Algorithms Ballast (Railroads) Compression Tests Finite Element Method Plasticity Railroad Tracks Repeated Loads Settlement (Structures) Structural Analysis Substructures
Publication/ Report Number:

NURail2017-UIC-R16
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final Report
Corporate Publisher:

National University Rail Center (NURail)
Abstract:

In this paper, finite element (FE) structural dynamics algorithms are used along with multibody systems (MBS) techniques to develop detailed railroad track substructure models to analyze the differential settlement in the ballast due to dynamic cyclic loading conditions. A cap plasticity material model is used in order to capture the geotechnical behavior of the ballast. The cap plasticity model includes enhancements to the Sandia GeoModel, such as improved computational tractability, robustness and domain of applicability. The material properties needed for the plasticity GeoModel are characterized with the help of several experimental triaxial compression tests on rail ballast. The ballast is divided into elastic and plastic regions to represent areas where the railway track is more prone to differential settlement, such as the ends of tunnels or passages over culverts. The rails are modeled using the absolute nodal coordinate formulation-based (ANCF) gradient-deficient beam elements, allowing seamless integration of beams with nonlinear structural dynamics algorithms. The solver to numerically integrate of the second order differential equations of motion is implemented in an in-house code. MBS algorithms are used to extract wheel-rail contact forces. Numerical results are presented and analyzed in the presence and absence of inelasticity considerations for the ballast.
Content Notes:

The final report for NURail project: NURail2017-UIC-R16 consists of two distinct documents related to the project titled: “Coupled Multibody and Finite Element Analysis of Rail Substructure Behavior.” This document appears on pp 33-68 of the final report. This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
Format:

PDF
Funding:

DTRT13-G-UTC52
Collection(s):

University Transportation Centers US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:f6d6923af9c44298f757762ec119c1c07be849bf198070ef42ee7b4ace8fa47b
Download URL:

https://rosap.ntl.bts.gov/view/dot/56312/dot_56312_DS1.pdf
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Computational Analysis of Railroad Ballast Settlement

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