TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

Comparative Analysis of Dynamic Behavior of Two HMA Railway Substructures

Accession Number:

01340736

Record Type:

Component

Abstract:

A numerical analysis using a finite element program was performed on three structures, these include: Hot Mix Asphalt (HMA) reinforced trackbed (ACRS-1), HMA direct supported trackbed (ACRS-2), and traditional Portland Cement Concrete (PCC) slab track (SlabTrack). Although the comprehensive dynamic responses of ACRS-1 were similar with SlabTrack, HMA layer can positively affect the stress distributions. Especially, the horizontal stresses indicate that the resilience of ACRS-1 was improved relative to SlabTrack. In addition, HMA reinforced substructure has capacity to recover the residual vertical deformation. At a depth of 2 meters beneath rails, the deformation and vertical acceleration of the three structures were negligible. However, when a depth from 0 to 2 meters analyzed the peak values of ACRS-2 were the largest among the three structures. So the effective depth for weakening dynamic loadings is mainly from 0 to 2 meters especially true at 0.5 meters from this analysis. The results from the analysis show that HMA is a suitable material for railway substructure to enhance resilient performance, improve the stress distribution, weaken dynamic loading, and lower the vibration especially at the effective depth of 2 meters. The HMA constructed at the top of the stone subbase layer allows the vertical modulus a smooth transition. In terms of the comprehensive dynamic behaviors, ACRS-1 is better than SlabTrack especially from the aspects stated above. The results for ACRS-2 are inconclusive and needs further research.

Supplemental Notes:

The DVD lists the title of this paper as: Comparative Analysis of Dynamic Behavior of Two Hot Mix Asphalt Railway Substructures.

Monograph Accession #:

01329018

Report/Paper Numbers:

11-1222

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Fang, Mingjing
Rose, Jerry
West, Randy C
Qiu, Yanjun
Ai, Changfa

Pagination:

14p

Publication Date:

2011

Conference:

Transportation Research Board 90th Annual Meeting

Location: Washington DC, United States
Date: 2011-1-23 to 2011-1-27
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures (7) ; References (17) ; Tables (1)

Uncontrolled Terms:

Slab track; Trackbeds

Subject Areas:

Design; Railroads; I22: Design of Pavements, Railways and Guideways

Source Data:

Transportation Research Board Annual Meeting 2011 Paper #11-1222

Files:

TRIS, TRB

Created Date:

Feb 17 2011 5:43PM