|本期目录/Table of Contents|

[1]许肇峰,陈映贞,张建.预应力混凝土梁桥火灾损伤分析与评定[J].南京工业大学学报(自然科学版),2020,42(03):291-301.
 XU Zhaofeng,CHEN Yingzhen,ZHANG Jian.Damage analysis and evaluation of pre-stressed concrete beam bridge after fire[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2020,42(03):291-301.
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预应力混凝土梁桥火灾损伤分析与评定()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
42
期数:
2020年03期
页码:
291-301
栏目:
出版日期:
2020-05-20

文章信息/Info

Title:
Damage analysis and evaluation of pre-stressed concrete beam bridge after fire
文章编号:
1671-7627(2020)03-0291-11
作者:
许肇峰1234陈映贞234张建1
1.东南大学 土木工程学院,江苏 南京 211189; 2.广东华路交通科技有限公司,广东 广州 510550; 3.广东交科检测有限公司,广东 广州 510550; 4.公路交通安全与应急保障技术及装备行业研发中心,广东 广州 510550
Author(s):
XU Zhaofeng1234 CHEN Yingzhen234 ZHANG Jian1
1. School of Civil Engineering, Southeast University, Nanjing 211189, China; 2. Guangdong Hualu Transport Technology Co. Ltd., Guangzhou 510550, China; 3. Guangdong Jiaoke Testing Co. Ltd., Guangzhou 510550, China; 4. Research Center for Highway Traffic Safety and Emergency Security Technology and Equipment of Ministry of Transport, Guangzhou 510550, China
关键词:
预应力混凝土梁桥 火灾 温度场 损伤分析 安全性评定
Keywords:
pre-stressed concrete beam bridge fire temperature field damage analysis safety evaluation
分类号:
U447
文献标志码:
A
摘要:
为了分析火灾后预应力混凝土梁桥结构损伤,评定灾后桥梁安全性,本文根据应急管理要求,制定了火灾后混凝土梁桥检测评定工作流程,归纳了重点和难点。首先,通过火场调查、混凝土外观检查和烧失量检测,推定构件表面最高温度。然后,采用有限元法分析桥梁构件温度场,并探讨不同温度下混凝土材料性能损伤劣化规律,提出火灾后混凝土构件截面损伤等效代换方法,给出了截面损伤量化公式。最后,结合桥梁静载试验结果,对火灾后预应力混凝土梁桥安全性能进行评定。结果表明:三面受火下混凝土T梁马蹄处温度场成指纹线分布,且温度沿着深度方向成非线性递减,有限元法计算得到的梁体表面温度与外观检查、烧失量推定结果基本一致。当量升温时间为60 min时,混凝土损伤沿表面深度逐渐递减,预应力钢筋工作性能未发生明显改变,火灾对梁体整体刚度影响不大。本文所提出的构件温度场检测分析方法和截面损伤等效计算方法可为类似桥梁火灾后检测评估提供参考。
Abstract:
To analyze the damage of pre-stressed concrete beam bridge after fire and evaluate its safety, an inspection and evaluation process of concrete girder bridge after fire was formulated according to the requirements of emergency management. Firstly, the maximum surface temperature of the component was estimated by fire investigation, concrete appearance inspection and ignition loss test. Secondly, the finite element method was used to analyze the temperature field of bridge components. Discussed the degradation laws of material properties of bridge components after high temperature, the equivalent replacement method of section damage of concrete members after fire was proposed,and the quantitative formula of damaged section was given. Finally, combined with the static load test of bridge,the safety of pre-stressed concrete beam bridge after fire was evaluated. The results showed that the temperature fields of T-beam horseshoe exposed to fire on three sides was fingerprint distribution, and the temperature decreased nonlinearly along the depth. The temperature at the bottom of the beam calculated by the finite element was basically the same as that by the visual inspection and the ignition loss test. When the equivalent temperature rise time was 60 min, the strength damage of concrete decreased gradually along the depth, the working performance of pre-stressed reinforcement did not changed, and the fire has little effect on the bending rigidity and bearing capacity of beam. The method of temperature field detection and equivalent calculation of section damage can provide reference for similar bridge damage assessment after fire.

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备注/Memo

备注/Memo:
收稿日期:2020-03-21
基金项目:国家重点研发计划(2019YFC1511100); 广东省交通运输厅科技项目(科技-2014-03-005)
作者简介:许肇峰(1981—),高级工程师,E-mail:25677369@qq.com; 张建(联系人),教授,E-mail:jian@seu.edu.
引用格式:许肇峰,陈映贞,张建.预应力混凝土梁桥火灾损伤分析与评定[J].南京工业大学学报(自然科学版),2020,42(3):291-301.
XU Zhaofeng, CHEN Yingzhen, ZHANG Jian. Damage analysis and evaluation of pre-stressed concrete beam bridge after fire[J].Journal of Nanjing Tech University(Natural Science Edition),2020,42(3):291-301..
更新日期/Last Update: 2020-05-31