开放环境下桥梁缆索钢丝群火灾温度效应研究  

Study on the Fire Temperature Effects of Bridge Cable Steel Wire Groups in Open Environment

作　　者：王世奥 杨来运 李佳炜 宋永生[1,2] 李金娥 WANG Shiao;YANG Laiyun;LI Jiawei;SONG Yongsheng;LI Jin'e(Jinling Institute of Technology,Nanjing 211169,China;Jiangsu Key Laboratory of Digital Intelligent Low-Carbon Transportation,Nanjing 211169,China)

机构地区：[1]金陵科技学院建筑工程学院,江苏南京211169 [2]数智低碳交通江苏省高校重点实验室,江苏南京211169

出　　处：《金陵科技学院学报》2025年第1期69-75,共7页Journal of Jinling Institute of Technology

基　　金：国家重点研发项目(SQ2024YFC3000083);江苏省土木建筑学会科研课题(JSTJXH24107)。

摘　　要：采用有限元分析软件ABAQUS建立了缆索钢丝群的精细有限元模型,通过模型验证桥梁缆索耐高温防护体系在不同参数(防护材料、防护层厚度以及钢丝数量)下的可行性。结果显示:钢丝数量的增加及其内部空腔的减小会增加缆索受火区域与远离火源区域之间的温差;玄武岩纤维复合材料展现出很好的隔热性能,相较于使用PE作为防护套的缆索,其在相同位置的温度更低,且热量在钢丝群内部的传递速率更低,从而显著提升了桥梁缆索的防火耐高温性能;随着防护层厚度的增加,缆索内外温差进一步扩大,为内部钢丝提供了更为有效的隔热保护,防护层厚度以7 mm为宜。A fine finite element model of cable steel wire groups was established by using the finite element analysis software ABAQUS,and the feasibility of the high-temperature resistance protection system for bridge cables was verified through the model under different parameters(including protective materials,thickness of protective layer and number of steel wires).The results showed that an increase in the number of steel wires and a decrease in their internal cavities would increase the temperature difference between area of the cable affected by fire and the area far away from the fire source.Basalt fiber composites material exhibited excellent thermal insulation performance.Compared to cables using PE as protective sheath,it had lower temperatures at the same position and lower heat transfer rates within the steel wire groups,significantly improving the fire resistance and high temperature resistance of bridge cables.With the increase of the thickness of the protective layer,the temperature difference between the inside and outside of the cable further expanded,which provided more effective thermal insulation protection for the internal steel wires.The suitable thermal insulation effect was achieved when the thickness of the protective layer was 7 mm.

关 键 词：悬索桥 钢丝群 开放性火灾 瞬态温度 温度场 抗火 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]