Effects of Performance Variations in Key Components of CRTS I Slab Ballastless Track on Structural Response Following Slab-Replacement Operations
Wentao Wu, Hongyao Lu, Yuelei He, Haitao Xia
TL;DR
This study examines how replacing deteriorated track slabs in CRTS I ballastless tracks affects structural performance, finding that new slabs improve strength but may create new stress points.
Contribution
The study introduces a refined finite-element model to evaluate structural response after slab replacement, revealing performance disparities and their impact on stress distribution.
Findings
Deteriorated slabs showed 10.74% lower strength than retained slabs before replacement.
New slabs exhibited a 25.26% strength increase over retained slabs after replacement.
Old filling resin had 35.13% lower elastic modulus than required, while new resin exceeded requirements by 31%.
Abstract
Slab-replacement operations are crucial for restoring deteriorated CRTS I slab ballastless tracks to operational standards. This study investigates the structural implications of the operation by evaluating the strength characteristics and material properties of track components both prior to and following replacement. Apparent strength was measured using rebound hammer tests on three categories of slabs: retained, deteriorated, and newly installed track slabs. In addition, samples of old and new filling resins were collected and tested to determine their elastic moduli. These empirical data were subsequently used to develop a refined finite-element model that captures both pre- and post-replacement conditions. Under varying temperature loads, disparities in component performance were found to significantly affect stress distribution. Specifically, before replacement, deteriorated track…
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Taxonomy
TopicsRailway Engineering and Dynamics · Infrastructure Maintenance and Monitoring · Metal Alloys Wear and Properties