火灾下多片式T梁的剪力滞效应分析

Analysis on shear lag effect of multi slice T-beam under fire

阐述了火灾对公路桥梁的危害性及研究的紧迫性,介绍了抗火研究状况及取得的成果,结合预应力钢筋、普通钢筋及普通混凝土材料的升降温特性,分析火灾下多片式T型梁的剪力滞效应及温度分布趋势,评估了多片式T型梁的灾后工作性能,为桥梁火灾后评估、设计以及维修加固提供参考。

This paper expounds the harmfulness of fire to the highway bridge and the urgency of the research,and introduces the research status of fire resistance. Combined with the temperature characteristics of prestressed reinforcement,ordinary steel bar and common concrete,shear lag effect and temperature distribution of multi slice T type beam are investigated in this paper. Besides that,the working performance of multi slice T beam after the fire is evaluated,which gives a reference for assessment,design and maintenance of the bridge after the fire.