[1]刘旭政,邵建业,郭河,等.车辆火灾下框架桥温度场及结构损伤分析[J].长安大学学报(自然科学版),2025,45(6):17-30.
　LIU Xu-zheng,SHAO Jian-ye,GUO He,et al.Analysis of temperature field and structural damage of frame bridges under vehicle fire[J].Journal of Chang’an University (Natural Science Edition),2025,45(6):17-30.
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车辆火灾下框架桥温度场及结构损伤分析()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年6期
页码:
17-30
栏目:
桥梁智能运维与防灾减灾
出版日期:
2025-11-30

文章信息/Info

Title:
Analysis of temperature field and structural damage of frame bridges under vehicle fire
文章编号:
1671-8879(2025)06-0017-14
作者:
刘旭政1; 2; 邵建业2; 郭河3; 乔磊3; 吴刚1; 2; 郑尚敏1; 2; 饶文真1
(1. 华东交通大学 山区土木工程安全与韧性全国重点实验室,江西 南昌 330013; 2. 华东交通大学 土木建筑学院,江西 南昌 330013; 3. 中交路桥工程检测股份有限公司,北京 101301)
Author(s):
LIU Xu-zheng1; 2;  SHAO Jian-ye2;  GUO He3;  QIAO Lei3;  WU Gang1; 2; ZHENG Shang-min1; 2;  RAO Wen-zhen1
(1. State Key Laboratory of Safety and Resilience of Civil Engineering in Mountain Area, East China Jiaotong University, Nanchang 330013, Jiangxi, China; 2. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, Jiangxi, China; 3. China Communications Construction Road &Bridge Inspection and Maintenance Co., Ltd., Beijing 101301, China)
关键词:
桥梁工程;  框架桥;  火灾损伤;  温度场;  车辆火灾;  顶板
Keywords:
bridge engineering;  frame bridge;  fire damage;  temperature field;  vehicle fire;  top slab
分类号:
U447
文献标志码:
A
摘要:
为探究框架桥在车辆火灾作用下的温度场分布及结构损伤,利用火灾动力学仿真软件FDS建立不同火灾场景下框架桥的数值模型,分析火灾强度、火灾位置、框架桥净跨径、桥宽和净高对顶板下表面绝热温度场的影响; 通过ABAQUS软件建立最不利火灾场景下框架桥的热传导模型,获取不同受火时间下框架桥的內部温度场分布,采用等温线法计算分析顶板危险段跨中截面等效面积、等效惯性矩和抗弯承载力随受火时间的变化规律,并建立相应的预测公式。研究结果表明:顶板下表面绝热温度随火灾强度增强而升高,随火灾位置与道路中心距离变近而升高,随框架桥净跨径增大而降低,随框架桥净高增大而升高; 框架桥桥宽对顶板下表面最高绝热温度无显著影响,但是最低绝热温度随桥宽的增大而降低; 最不利火灾场景下顶板下表面的最低绝热温度和最高绝热温度分别达到了1 154 ℃和1 350 ℃; 由于混凝土具有良好的热惰性,火灾作用下顶板危险段内部温度沿其厚度方向急剧降低; 顶板危险段跨中截面300 ℃、500 ℃和800 ℃等温线深度随受火时间的延长而增大,但是增大速率逐渐变缓; 顶板危险段跨中截面面积缩减系数、惯性矩缩减系数和抗弯承载力缩减系数均随受火时间的延长呈二次函数递减。研究结果可为框架桥火灾损伤评估、加固修复等方面提供参考。
Abstract:
To explore the temperature field distribution and structural damage of frame bridges under vehicle fire, numerical models under different fire scenarios were established by fire dynamics simulator(FDS). The influences of fire intensity, fire position, net span, bridge width and net height on the adiabatic temperature fields of the soffit of top slab were analyzed. Heat transfer model of frame bridge under most unfavorable fire scenario was established by ABAQUS software, and internal temperature field distributions of frame bridge at different fire times were obtained. The variation laws of mid-span section equivalent area, equivalent moment of inertia and flexural capacity of the critical section of top slab with fire time were analyzed by isotherm method, and the corresponding predictive equations were established. The research results show that the adiabatic temperature of the soffit of top slab increases with the increase of fire intensity, the distance between fire location and road centerline, and the net height of frame bridge decreases with the increase of the net span of frame bridge. The width of frame bridge has no significant effect on the maximum adiabatic temperature of the soffit of top slab, although the minimum adiabatic temperature decreases with the increase of bridge width. Under the most unfavorable fire scenario, the minimum and maximum adiabatic temperatures of the soffit of top slab reach 1 154 ℃ and 1 350 ℃, respectively. The internal temperature of the critical section of top slab decreases sharply along the thickness direction because concrete features pronounced thermal inertia. The isotherm depths corresponding to 300 ℃, 500 ℃ and 800 ℃ at the mid-span section of the critical section of top slab increase with fire duration, although the increase rate gradually slows down. The reduction coefficients of the mid-span section area, moment of inertia and flexural capacity of the critical section of top slab all decrease quadratically with fire duration. The research results provide a reference for fire damage assessment, reinforcement and repair of the frame bridges under vehicle fire.4 tabs, 28 figs, 36 refs.

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备注/Memo

备注/Memo:
收稿日期:2025-05-21
基金项目:国家自然科学基金项目(52068026,52368073); 赣鄱俊才支持计划项目(20243BCE51050); 江西省自然科学基金项目(20232BAB204070,20232BAB204071)
作者简介:刘旭政(1980-),男,江西吉安人,教授,工学博士,E-mail:urbwolf@126.com。
更新日期/Last Update: 2025-12-20