东南大学学报（自然科学版）2026，Vol.56Issue(4)：581-590,10.DOI:10.3969/j.issn.1001-0505.2026.04.011
气凝胶复合防护大尺度主缆模型开放空间耐火试验研究
Open space fire tests of the large-scale main cable model protected by aerogel felt
摘要
Abstract
The main cable of a long-span suspension bridge is a non-replaceable load-bearing component.Its fire resistance performance directly determines the safety of the suspension bridge exposed to fire.This paper proposes an experimental methodology for a large-scale main cable model exposed to fire in open space.The diameter of the cross-section is designed based on the temperature equivalence method of surface steel wire,and the model is constructed by assembly.The calibration and control of the non-uniform temperature field in open space are achieved by the response surface methodology.Based on the fire protection requirements of Shenzhong Bridge,a protective system of wrapping tape+aerogel blanket+wrapping tape+topcoat is pro-posed.The open space fire tests of the large-scale main cable model were carried out.The results demonstrate that the protection system effectively safeguarded the main cable exposed to fire and exhibited reliable redun-dancy of 28%-45%,and the advice of positioning the longitudinal seam of aerogel blankets at the crown of the main cable was proposed.The protective materials and surface steel wire exhibited characteristics of non-uniform temperature distribution,and the temperature difference was 67%-75%.The interior of the model exhibited characteristics of uniform temperature distribution and the temperature was within 40℃.The impact of pressure on the fire pressure of the protective system was within 10%,and pressure did not affect the deter-mination of the design standard.This research can provide experimental support for the fire protection design of main cables.关键词
主缆耐火试验/开放空间火灾/大尺度主缆模型/非均匀温度场控制/主缆碾压Key words
main cable fire test/open space fire/large-scale main cable model/non-uniform temperature field control/pressure on the main cable分类
交通工程引用本文复制引用
孙浩东,陈伟,范传斌,陈焕勇,闵亮,田奎..气凝胶复合防护大尺度主缆模型开放空间耐火试验研究[J].东南大学学报（自然科学版）,2026,56(4):581-590,10.基金项目
国家重点研发计划资助项目(2024YFC3016901) （2024YFC3016901）
江苏省基础研究计划资助项目(BK20240103) （BK20240103）
中央高校基本科研业务费专项资金资助项目(2025QN1043). （2025QN1043）
