桥梁CFRP缆索外包陶瓷纤维的防火性能研究
PDF下载 (384)徐玉林,诸葛萍,孙莉莉,桑琴杨,储焙宇.桥梁CFRP缆索外包陶瓷纤维的防火性能研究[J].宁波大学学报(理工版),2019,32(2):91-96.DOI:
XU Yu-lin,ZHUGE Ping,SUN Li-li,SANG Qin-yang,CHU Bei-yu.Fire safety of CFRP cable system under the bridge fire[J].Journal of Ningbo University(Natural Science & Engineering Edition),2019,32(2):91-96.DOI:
| Title: | Fire safety of CFRP cable system under the bridge fire |
| 作者: | 徐玉林, 诸葛萍, 孙莉莉, 桑琴杨, 储焙宇 |
| Author(s): | XU Yu-lin, ZHUGE Ping, SUN Li-li, SANG Qin-yang, CHU Bei-yu |
| 关键词: | 桥梁工程; 碳纤维增强复合材料; 缆索; 火灾; 陶瓷纤维 |
| Keywords: | bridge engineering; CFRP; cable; fire; ceramic fiber |
| 分类号: | U444 |
| 文献标识码: | A |
| 摘要: | 碳纤维增强复合材料(CFRP)轻质高强, 性能优异, 但其耐高温性能差. 对桥梁CFRP缆索外包30mm厚陶瓷纤维(CF)防火层的防火性能进行了模型试验研究, 使用有限元软件建立了相应的数值分析模型. 利用数值模拟对热释放率分别为100和300MW两种桥面火灾作用下外包不同CF厚度的CFRP缆索内部的升温过程进行计算, 获得了各工况对应的缆索临界安全耐火时长, 并建立了CFRP缆索CF防火层厚度—临界安全耐火时长关系模型. 研究结果表明, 桥面火灾作用下, 对CFRP缆索外包CF防火层可大幅提高缆索的临界安全耐火时长. CF厚度与缆索临界安全耐火时长基本上呈线性关系. 在热释放率为100和300MW的车辆火灾持续作用下, 当CF防火层为70mm时, 防火层-CFRP缆索界面温度达到250℃所需的临界安全耐火时长分别为49和43min. |
| Abstract: | To address the problem of poor performance of the carbon fiber reinforced polymer (CFRP) cable, experiment and simulation were conducted under the 30mm thick ceramic fiber (CF) blanket condition. By using the finite analysis software, the performance of the CF with the thickness varying from 40 to 70mm under the 100 and 300MW scales vehicle fire was investigated, from which the relationship between the thickness of CF layer and fire resistance was acquired. And then the relation model between the thickness of fire protection layer and critical safety time was established. The research shows that wrapping CF blanket can effectively prolong the critical safety time of the CFRP cable under the bridge fire. There is a linear relationship between the thickness of CF blanket and critical safety time. With the thickness of CF blanket being 70 mm, the safety times will be 49 and 43min respectively when the temperature is 250℃ on the interface of fire blocking layer and the CFRP cable is under the 100 and 300 MW scale fire for one hour. |
| 参考文献 /References: | [1] 李翠娟, 童育强, 刘明虎, 等. 超大跨径CFRP主缆悬索桥合理结构体系研究[J]. 中国铁道科学, 2011, 32(1): 62-67. [2] 诸葛萍, 章子华, 丁勇, 等. 土木工程用CFRP筋弯折抗拉性能[J]. 复合材料学报, 2014, 31(5):1300-1305. [3] 唐龙贵, 赵书经. 碳纤维的抗氧化处理[C]. 中国科学技术协会青年学术年会, 1995:1301-1305. [4] Wang Y C, Wong P M H, Kodur V. An experimental study of the mechanical properties of fiber reinforced polymer (FRP) and steel reinforcing bars at elevated temperatures [J]. Composite Structures, 2008, 80(1):131-140. [5] Wang Y C, Kodur V. Variation of strength and stiffness of fibre reinforced polymer reinforcing bars with temperature [J]. Cement & Concrete Composites, 2005, 27(9):864-874. [6] Wang Y C, Wong P M H, Kodur V.Mechanical properties of fibre reinforced polymer reinforcing bars at elevated temperatures[C]. SFPE/ASCE Specialty Conference: Designing Structures for Fire, 2003:183-192. [7] Bisby L A, Foster S K. High temperature residual properties of externally-bonded FRP systems[C]. 7th International Symposium on Fiber-Reinforced Polymer Reinforcement for Concrete Structures, 2005:1235-1252. [8] 贾玉莲. 油罐车火灾的数值模拟[D]. 太原: 中北大学, 2010. [9] Williams B K, Kodur V K R, Bisby L A, et al. The performance of FRP-strengthened concrete slabs in fire[C]. 4th International Conference on Advanced Composite Materials in Bridges and Structures, 2004:1-8. [10] Bisby L A , Kodur V K R, Green M F. Performance in fire of FRP confined reinforced concrete columns[C]. 4th International Conference on Advanced Composite Materials in Bridges and Structures, 2004:16-20. [11] 徐志胜, 冯凯, 张威振, 等. CFRP加固钢筋混凝土梁火灾后的试验研究[J]. 哈尔滨工业大学学报, 2005, 37(1):98-100. [12] 吴波, 王军丽. 碳纤维布加固钢筋混凝土板的耐火性能试验研究[J]. 土木工程学报, 2007, 40(6):26-31. [13] 胡克旭, 何桂生. 碳纤维加固钢筋混凝士梁防火方法试验研究[J]. 同济大学学报, 2006, 34(11):1451-1456. [14] Turkowski P, ?ukomski M, Sulik P, et al. Fire resistance of CFRP-strengthened reinforced concrete beams under various load levels[J]. Procedia Engineering, 2017, 172:1176-1183. [15] Carlos T B, Rodrigues J P C, de Lima R C A, et al. Experimental analysis on flexural behaviour of RC beams strengthened with CFRP laminates and under fire conditions[J]. Composite Structures, 2018, 189:516-528. [16] 崔之开. 陶瓷纤维[M]. 北京: 化学工业出版社, 2004. [17] Holman J P. Heat Transfer[M]. Osborne: McGraw-Hill, 1985. [18] 李利军. 公路火灾温度场数值模拟及大跨径缆索承重桥梁火灾分析[D]. 西安: 长安大学, 2013. [19] Griffis C A, Masumura R A, Chang C I. Thermal response of graphite epoxy composite subjected to rapid heating[J]. Journal of Composite Materials, 1981, 15(5): 427-442. |
| 备注/Memo: | 收稿日期: 2018－05－15. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 浙江省自然科学基金（LY15E080012）; 宁波市自然科学基金（2017A610314）; 桥梁工程结构动力学国家重点实验室开放基金（201506）; 浙江省大学生科技创新活动计划（2018R405040）. 第一作者: 徐玉林（1993－）, 男, 山西晋城人, 在读硕士研究生, 主要研究方向: 结构工程. E-mail: 1224431255@qq.com *通信作者: 诸葛萍（1982－）, 男, 浙江瑞安人, 博士/副教授, 主要研究方向: 桥梁工程. E-mail: zhugeping@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
