大跨径悬索桥承重构件公路火灾安全距离研究

发布时间：2018-06-23 23:07

本文选题：桥梁工程 + 悬索桥　；参考：《广西大学学报(自然科学版)》2014年04期

【摘要】：为研究公路火灾对大跨径悬索桥带来的影响,弥补悬索桥火灾研究的空白,结合结构火灾分析的特点,确定选择间接耦合法进行热—结构耦合分析。以300 MW车辆火灾为例,运用ANSYS有限元程序,建立了悬索桥不同断面的火灾坐标模型,在总结国内外火灾研究工作的基础上,基于Ingason H.平方增长模型,以典型的大跨径悬索桥缆索承重构件的公路火灾安全距离为研究对象,以降低工程风险、保证大跨径悬索桥结构的安全性和稳定性为研究目标,对大跨径悬索桥吊索和主缆安全距离进行数值模拟,提出了适用于公路火灾研究的热释放率数学模型;建立了公路火灾的物理模型并确定了公路火灾燃烧热源的尺寸和单位面积释热率;并通过热—结构耦合分析,确定了公路火灾下悬索桥吊索和0.4~1.0 m范围内不同直径主缆的安全距离。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。
[Abstract]:In order to study the influence of highway fire on long-span suspension bridge and make up the blank of fire research of suspension bridge, combined with the characteristics of structural fire analysis, indirect coupling method was chosen to conduct thermal-structural coupling analysis. Taking 300 MW vehicle fire as an example, the fire coordinate model of different sections of suspension bridge is established by using ANSYS finite element program. Based on the summary of fire research work at home and abroad, Ingason H. In order to reduce the engineering risk and ensure the safety and stability of the long-span suspension bridge structure, the square growth model takes the fire safety distance of the cable bearing members of a typical long-span suspension bridge as the research object, and aims at reducing the engineering risk and ensuring the safety and stability of the long-span suspension bridge structure. The safety distance between slings and main cables of long-span suspension bridges is numerically simulated, and a mathematical model of heat release rate suitable for highway fire research is proposed. The physical model of highway fire is established and the size and heat release rate per unit area of the combustion heat source of highway fire are determined, and the thermal-structural coupling analysis is carried out. The safety distance of suspension bridge slings and main cables with different diameters in the range of 0.4 ~ 1.0 m under highway fire is determined. The research results can provide scientific basis for fire resistance design of long span suspension bridge in the future.
【作者单位】：山东建筑大学交通工程学院;长安大学公路学院;鲁东大学土木工程学院;
【基金】：交通运输建设重大科技专项(2011318223170)
【分类号】：U448.25

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