现代交通技术2025，Vol.22Issue(3)：46-49,4.
预应力小箱梁桥抗弯承载力的火灾损伤研究
Fire Damage Research on Flexural Capacity of the Prestressed Small Box Girder Bridge
潘自强1
作者信息
- 1. 中交第二公路勘察设计研究院有限公司,武汉 430056
- 折叠
摘要
Abstract
In order to know the loss of flexural capacity of a prestressed small box girder bridge after fire,the influence of high temperature on the mechanical properties of concrete,reinforcement and prestressed tendons is studied based on the analysis of structural performance after fire.By introducing the reduction coefficient of elastic modulus of reinforcement and prestressed reinforcement,the calculation formula of flexural capacity of structure after fire is modified,which is more in line with the flexural characteristics of prestressed small box girder after fire.By comparing the loss rate of flexural capacity at different po-sitions before and after the fire,the model analysis shows that:high temperature will cause irreparable damage to the steel bar and prestressed steel strands,resulting in the reduction of their elastic modulus and tensile strength,but it has little influ-ence on the material properties of concrete.The flexural capacity reduction of the typical fire-damaged section of left span was more obvious,and the maximum damage rate reached 1.54％.关键词
火灾/预应力小箱梁/折减系数/抗弯承载力Key words
fire/prestressed small box girder/reduction coefficient/flexural capacity分类
交通工程引用本文复制引用
潘自强..预应力小箱梁桥抗弯承载力的火灾损伤研究[J].现代交通技术,2025,22(3):46-49,4.
