Study on temperature gradient of CRTS Ⅰ twin-block ballastless track on bridge in summer
DAI Gonglian
LIANG Jinbao
ZHU Junpu
SU Haiting
Abstract：The regular distribution of temperature gradient of track structure under high temperature in summer are analyzed in detail through the continuous temperature field monitoring of CRTS Ⅰ twin block ballastless track on simple supported beam bridge in Southeast China.The statistical probability models of temperatures and temperature differences of track structure in summer are established by higher moment method,which have ascertained the representative values of temperatures and temperature differences of track structure with a certain return period,and the transverse and vertical temperature fitting module of twin-block ballastless track in southeastern China have been put forward.The analysis results have revealed that the representative values of high temperature are 47.7 ℃,40.1 ℃,36.9 ℃ and 35.8 ℃ from top to bottom in the middle of track in summer with the exceedance probability of 0.01.The temperature gradient distributions of track structure are uniform in sunshine,and the maximum positive gradient from the transverse and vertical point reaches in 17:00 and 15:00,with the temperature reaching 6.7 ℃ and 12.2 ℃ respectively.The positive and negative representative values between the vertical and the transverse base are 16.16 ℃,-6.32 ℃ and 7.75 ℃,-4.43 ℃ respectively with the exceedance probability of 0.01,and the vertical positive and negative representative values are fitted by the exponential form,which is approached to the temperature load modes of the concrete box girder in Chinese railway bridge code.The transverse positive and negative representative values are fitted by the polyline with higher accuracy.
Keywords：ballastless tracktemperature gradienthigher order moment methodexperimental study
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 40-46 )