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

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

Journal of ZheJiang University (Engineering Science)

2023, Vol. 57

Issue (9): 1746-1755 DOI: 10.3785/j.issn.1008-973X.2023.09.006

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

Xue-hong LI1(

),Yu-xuan LEI1,Jun ZHAO2,Zhi-ming GUO3,Jun-jie YU4,Xiu-li XU1,*(

)

1. College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China
2. Jiangsu FaErSheng Cable Limited Company, Jiangyin 214445, China
3. Nanjing Public Engineering Construction Center, Nanjing 210019, China
4. East China Branch of China Railway Major Bridge Reconnaissance and Design Institute Limited Company, Nanjing 210031, China

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Abstract

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.

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

Received: 13 November 2022 Published: 16 October 2023

CLC:

U 447

Fund: 江苏省交通运输科技项目（2021QD06）；江苏省研究生实践创新计划（SJCX22_0464）

Corresponding Authors: Xiu-li XU E-mail: lixuehongnj@163.com;njxuxiuli@163.com

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Cite this article:

Xue-hong LI,Yu-xuan LEI,Jun ZHAO,Zhi-ming GUO,Jun-jie YU,Xiu-li XU. Fire resistance performance and protection of long-span suspension bridge main cable. Journal of ZheJiang University (Engineering Science), 2023, 57(9): 1746-1755.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.09.006 OR https://www.zjujournals.com/eng/Y2023/V57/I9/1746

大跨悬索桥主缆抗火性能及其防护

为了分析主缆的抗火性能并提出适宜的抗火防护方案，基于实际工程，采用油罐车燃烧火灾模型计算方法，分别从油罐车火灾燃烧的形式、火灾发生的位置、火灾燃烧的状态等方面进行对比分析，确定悬索桥最不利火灾场景为无风工况+油罐火灾+顶面和近主缆侧面燃烧+跨中靠近吊索位置. 采用Ansys软件分析最不利火灾场景下主缆的温度分布及耐火极限，得到主缆的耐火极限为48 min，最大失效厚度为90 mm. 通过对各类防火材料分析和调研，提出高硅氧复合材料防火结构；在高温试验60 min后，试件防火结构内侧温度为484 ℃，压缩后的防护结构的抗火性能略有提升. 基于试验结果并结合数值模拟，得到10 mm厚高硅氧复合防火结构；该结构可以满足在火灾发生后60 min主缆外表面温度不超过300 ℃的抗火设计目标.

关键词： 悬索桥主缆, 油罐车火灾, 最不利火灾场景, 空气升温曲线, 抗火性能, 抗火防护目标, 防护方案

Fig.1 General layout of Nanjing Xianxin Road river crossing passage bridge

Fig.2 Standard cross-sectional of stiffened beam

Fig.3 Finite element model of whole bridge

Fig.4 Cross section of main cable

Fig.5 Fire calculation model on fire dynamics simulator

Fig.6 Heat release rate curve of each combustion surface

Tab.1 Key parameters of oil tank fire

Tab.2 Key parameters of oil pool fire

Fig.7 Comparison of air temperature distribution for tanker fire

Fig.8 Air temperature variations with height at different horizontal distance from tank edge to main cable

Fig.9 Air temperature field in most unfavorable fire scenario

Fig.10 Air temperature distribution along height in most unfavorable fire scenario

Fig.11 Comparison of three temperature rise curves

Fig.12 Temperature distribution curve of main cable section along radius direction

Fig.13 Average temperature variation curve of main cable cross-section with time at different heights

Fig.14 Average temperature variation curve of main cable cross-section with height

Fig.15 Finite element model of main cable

Fig.16 Time history curves for two types of unprotected main cables in most severe fire scenarios

Fig.17 Specimen plan, measuring point layout and specimen appearance after processing

Fig.18 Heating curve in furnace for material comparison test

Fig.19 Specimens after Comparison test of protective materials

Fig.20 Time history curve of temperature at each measuring point with different schemes

Fig.21 Heating curves in furnace of main cable fire resistance test

Fig.22 Appearance of specimen before and after effects test of protective

Fig.23 Each measuring point temperature of specimen at 60 min

Fig.24 Appearance of specimen before and after diameter influence effect test of main cable

Fig.25 Correlation curve of diameter and cross-section shape factor with temperature of specimen

Fig.26 Curve of outermost temperature variation with main cable diameter

Fig.27 Time history curve of outermost temperature after main cable protection


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