防灾减灾工程学报2026，Vol.46Issue(2)：369-378,10.DOI:10.13409/j.cnki.jdpme.20240624004
车辆火灾下悬索桥桥面空间温度场分布特征研究
Study on Temperature Field Distribution Characteristics in Suspension Bridge Deck Space under Vehicle Fires
摘要
Abstract
This study aims to investigate the distribution characteristics of the temperature field in the suspension bridge deck space under vehicle fires,thereby providing thermal boundary conditions for fire resistance analysis of suspension bridges.A computational fluid dynamics(CFD)model of vehicle combustion was established using FDS software.The combustion characteristics and temperature-af-fected ranges of different vehicles were analyzed,the surface temperature rise process of cable compo-nents under tanker truck fires was clarified,and the limitations of using standard fire temperature rise curves as bridge fire source models were discussed.The results showed that the maximum surface en-vironment temperature of cable components of Longtan Bridge reached 1 170 °C under tanker truck fires,indicating that tanker truck fires posed a severe threat to the safety of cable components.Under windless conditions,the temperature-affected ranges of tanker truck fires in the vertical,longitudinal,and transverse directions were approximately 30 m,20 m,and 20 m,respectively,and were signifi-cantly influenced by wind speed on the bridge deck.As the longitudinal wind speed increased,the tem-perature-affected range decreased vertically and increased longitudinally.The maximum temperatures and heating rates of ISO 834 and ASTM E119 standard fires were significantly lower than those of tanker truck fires.The HC standard fire curve failed to simulate the temperature rise patterns at loca-tions away from the fire source center.For fire resistance analysis of cable components of Longtan Bridge,the fire source model is recommended to be determined using FDS calculation results.关键词
悬索桥/车辆火灾/火源模型/温度场分布/温度影响范围/抗火保护设计Key words
suspension bridge/vehicle fire/fire source model/temperature field distribution/tempera-ture-affected range/fire protection design分类
交通工程引用本文复制引用
陈巍,沈锐利,郑植,冯帅兴,陈兴华,齐东春..车辆火灾下悬索桥桥面空间温度场分布特征研究[J].防灾减灾工程学报,2026,46(2):369-378,10.基金项目
湖北省自然科学基金(2024AFB171)、桥梁工程安全与韧性全国重点实验室开放基金(2024SKLBSR-DW018)、防灾减灾湖北省重点实验室(三峡大学)开放基金(2023KJZ21)资助 （2024AFB171）
