大跨径悬索桥缆索承重构件公路火灾的瞬态空间温度场数值模拟  

Numerical simulation of highway fire transient space temperature field of bearing elements of long-span suspension bridge

作　　者：李利军[1] 万祥斌 董晓明[3] 

机构地区：[1]山东建筑大学交通工程学院,山东济南250101 [2]聊城市公路管理局,山东聊城252000 [3]鲁东大学土木工程学院,山东烟台264025

出　　处：《合肥工业大学学报（自然科学版）》2015年第5期659-663,共5页Journal of Hefei University of Technology：Natural Science

基　　金：交通运输建设重大科技专项资助项目(2011318223170)

摘　　要：文章在国内外火灾研究工作的基础上,基于Ingason H平方增长模型,提出了适用于公路桥梁火灾研究的热释放率数学模型;根据建立的公路火灾物理模型,通过数值模拟给出公路火灾下悬索桥主缆、吊索表面温度及热流密度随火灾的发展过程而变化的规律公式,并建立了承重构件瞬态空间温度场。同一火灾场景下,不同直径的吊索可以采用相同的瞬态空间温度场;不同直径的主缆在不同位置具有相同的温度θt2时,可以采用相同的瞬态空间温度场。该研究成果可为今后大跨径悬索桥的抗火设计提供科学依据。By reviewing and analyzing fire studies conducted at home and abroad, and based on the Ingason H Square Growth Model, several kinds of thermal release rate mathematical models are put forward, which are suitable for the fire studies of highway bridges. Based on the established physical model of highway fire, the trend of how the surface temperature and heat flux density of main and suspender cables of suspension bridge change with fire situation is observed through the numerical simulation. And the transient space temperature field of bearing elements is established. Under the same conditions of fire accident, the same transient space temperature field can be applied to suspender cables with different diameters; the same transient space temper- ature field can be applied to main cables with different diameters when they have the same θt2 at different places. The research results can provide scientific basis for the fire resistance design of long-span suspension bridge.

关 键 词：桥梁工程 悬索桥 吊索 主缆 公路火灾 表面温度 热流密度 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]