|Table of Contents|

Reliability analysis of embedded track continuous welded rail on simply supported beam bridge(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2020年04期
Page:
70-79
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Reliability analysis of embedded track continuous welded rail on simply supported beam bridge
Author(s):
FENG Qing-song;  SUN Kui;  LEI Xiao-yan;  CHEN Hua-peng
Engineering Research Center of Railway Environmental Vibration and Noise of Ministry of Education, East China Jiaotong University, Nanchang 330013, Jiangxi, China
Keywords:
embedded track;  continuous welded rail;  response surface method;  Monte Carlo method;  reliability theory
PACS:
U213.2
DOI:
10.19818/j.cnki.1671-1637.2020.04.005
Abstract:
To analyze the influences of key factors on the mechanical characteristics of embedded track continuous welded rail on bridges, and evaluate it based on the reliability theory, the finite element method was used to establish the calculation model of embedded track continuous welded rail on the simply supported beam bridge. The longitudinal resistance of polymer material and the temperature difference of beam body were selected as the random variables, and the distribution types and distribution parameters of random variables were determined according to the actual working conditions. The response surface test was designed by the central composite test design method. The function relationship between the random variable and the response was fitted by the least square method. Thus, the quadratic polynomial response surface model of track-bridge relative displacement with respect to the longitudinal resistance of polymer material and the temperature difference of beam body was established. The correctness of the established model was verified by the variance analysis, and the parameter sensitivities of random variables were carried out through the sensitivity analysis method. The limit state equation of long-term service performance of embedded track continuous welded rail on bridges was constructed. The reliability of embedded track continuous welded rail on the simply supported beam bridge was comprehensively evaluated by using the Monte Carlo method and the response surface model. Analysis result shows that the sensitivity coefficients of temperature difference of beam body and longitudinal resistance of polymer material to the track-bridge relative displacement are 0.99 and -0.08, respectively. Therefore, the influence of temperature difference of beam body on the track-bridge relative displacement is much greater than that of the longitudinal resistance of polymer material. After considering the randomnesses of parameters, the track-bridge relative displacement under the action of temperature has a certain dispersion, mainly distributes in the range of 4.0-6.5 mm, and approximately follows the normal distribution. In the absence of special treatment measures, the embedded track on bridges should not be built in areas with large annual temperature difference. The proposed reliability evaluation method of embedded track continuous welded rail on bridges can provide a theoretical guidance for the design of embedded track structure. 8 tabs, 9 figs, 32 refs.

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Last Update: 2020-08-20