Temperature pattern of steel-concrete composite girder of high-speed railway in coastal area

被引：0
|
作者：
Dai G. [1 ]
Zhang Q. [1 ]
Tang Y. [2 ]
Huang Z. [3 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] School of Resources and Safety Engineering, Central South University, Changsha
[3] Southeast Coastal Railway Fujian Co. Ltd., Fuzhou
来源：
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | 2022年 / 50卷 / 08期
关键词：
high-speed railway; steel-concrete composite girder; temperature pattern; thermal field model; time history model;
D O I：
10.13245/j.hust.220819
中图分类号：
学科分类号：
摘要：
To obtain the temperature distribution and temperature pattern of composite girder of high-speed railway in coastal areas, combined with the measured data of Quanzhou Bay sea-crossing railway bridge, the time history models of structural temperature component were established under conditions of heating and cooling. Meanwhile the positive and negative vertical temperature pattern of steel-concrete composite girder was obtained. Using the equivalent method of structural heat flow boundary, an efficient one-dimensional finite element model of girder thermal field was established. The maximum errors between numerical results and measured datas and results of a 3D FEM are respectively 9.7% and 4.3%. The calculation efficiency of the model is improved by nearly 30 times. Through the statistics of temperature distribution characteristic of composite girder, the following conclusions are gained. Under the condition of cooling, the thermal field in the concrete slab is distributed with the form of diagonal-double broken line, the temperature inflection point appears on the steel-concrete contact surface, and the difference is 1.4 ℃ . The field distribution of the girder web is the arch shape. Under the condition of heating, the most unfavorable positive and negative temperature difference in concrete slab show exponential distribution and linear distribution respectively, and the field of web shows linear distribution. © 2022 Huazhong University of Science and Technology. All rights reserved.
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页码：142 / 148
页数：6
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