Fire resistance performance and protection of long-span suspension bridge main cable

被引：2

作者：

Li X.-H. ^{[1
]}

Lei Y.-X. ^{[1
]}

Zhao J. ^{[2
]}

Guo Z.-M. ^{[3
]}

Yu J.-J. ^{[4
]}

Xu X.-L. ^{[1
]}

机构：

[1] College of Civil Engineering, Nanjing Tech University, Nanjing

[2] Jiangsu FaErSheng Cable Limited Company, Jiangyin

[3] Nanjing Public Engineering Construction Center, Nanjing

[4] East China Branch of China Railway Major Bridge Reconnaissance and Design Institute Limited Company, Nanjing

来源：

Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2023年 / 57卷 / 09期

关键词：

air heating curve; fire protection target; fire resistance; main cables for suspension bridge; most unfavorable fire scenario; protection scheme; tanker fire;

D O I：

10.3785/j.issn.1008-973X.2023.09.006

中图分类号：

学科分类号：

摘要：

In order to analyze the fire resistance performance of the main cable and to propose the appropriate fire resistance protection scheme, based on the actual project, the calculation method for tank truck fire model was adopted to make a comparative analysis from the aspects of the tank truck fire burning form, the fire location and the fire burning state. The most unfavorable fire scenario of a suspension bridge was determined as windless condition+oil tank fire+top surface and near main cable side combustion+mid-span near sling position. The Ansys software was used to analyze the temperature profile and the fire resistance limits of the main cable in the most unfavorable fire scenarios. The fire resistance limit of the main cable was 48 minutes and the maximum failure thickness was 90 mm. Through the analysis and the investigation of various fireproof materials, a fireproof structure of high-silica composite material was proposed. After 60 min of an elevated temperature test, the inner temperature of the fireproof structure of the specimen was 484 ℃, and the fire resistance was slightly improved after the compression of the protective structure. Based on the test results and the numerical simulation, a 10 mm thick high-silica composite material fireproof structure was obtained. The obtained structure could meet the fire resistance design goal that the outer surface temperature of the main cable should not exceed 300 ℃ after 60 min of a fire. © 2023 Zhejiang University. All rights reserved.

引用

页码：1746 / 1755

页数：9

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