Sequential Track–Bridge Interaction Analysis of Quick-Hardening Track on Bridge Considering Interlayer Friction

Abstract

A quick-hardening track (QHT) was developed by injecting quick-hardening mortar into an existing ballast track to rapidly substitute the ballast track with a slab track, thereby improving maintainability and running safety. QHT tracks on a bridge undergo track–bridge interactions similar to other track systems. This paper presents a model to analyze the interaction between the QHT and the bridge. This model considers the longitudinal resistances of rail fasteners and anchors, as well as the interlayer friction between the track and the bridge. A sequential analysis method was applied to systematically consider such effects, revealing that rail additional stress will be high if the track slips over the bridge for a very low frictional coefficient of 0.1. Furthermore, a track segment without an anchor can slip under train traction load when the frictional coefficient is 0.3 or lower. For low friction cases, low-speed operation is advised to prevent the accumulation of the resulting longitudinal slip displacements of the track. An anchor should be installed immediately after the quick-hardening mortar provides sufficient bearing strength to the anchors. The proposed sequential analysis is useful for determining the critical friction coefficient and appropriate longitudinal resistance of a rail fastener, as well as for verifying track safety.

Numerical Study on Track–Bridge Interaction of Integral Railway Rigid-Frame Bridge

“…The calculated results of the broken gap with the adoption of two different kinds of fasteners are shown in Table 4. The calculation results of the broken gap of a CWR by the finite element analysis method are in good agreement with those of Equation (16). 3.…”

“…Choi et al [15] analyzed the track-bridge interaction of a continuous bridge with a sliding slab track, considering the behavior of end-supporting anchors. Cho et al [16] presented a model to analyze the interaction between quick-hardening tracks and a bridge considering the interlayer friction. Chen and Wang et al [17] conducted comparative research on the track-bridge longitudinal interaction of CWRs on three types of arch bridges, including deck, half-through and through arch bridges.…”

“…The connection constraint parameters and their corresponding values are specifically provided in the Table 2. Several large-scale finite element (FE) software programs, such as ANSYS, ABAQUS and MIDAS, are widely adopted to study the track-bridge interaction of railway bridges ( [4,[11][12][13][14][16][17][18][19][20][25][26][27][28][29]). In [28], an analysis comparing such software with the calculating examples in UIC 774-3 was carried out and the analysis results verified the high precision of FE software.…”

Quantification of vertical, lateral, and longitudinal fastener demand in broken spike track: Inputs to mechanistic-empirical design

“…This model uses a bar resting in a longitudinally elastic foundation, analogous to the BOEF method used for vertical load distribution. More elaborate, nonlinear FE models have been developed 52 and are even available in commercial software. 53 Despite these advancements, rail seat load distribution is not thoroughly described in the context of the loading demands on the fastening system components.…”