TRC加固钢筋混凝土板的抗火性能试验研究
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摘要
设计了7块钢筋混凝土单向板试件,其中6块为纤维织物网格增强混凝土(TRC)加固试件,另1块为未加固的对比试件,通过ISO 834标准火灾试验研究了TRC加固混凝土板的抗火性能,以及不同施工工艺(喷涂、抹灰)、不同纤维织物层数(1层、2层)和不同锚固构造措施(纤维网格与主结构拉结与否)对TRC加固混凝土板的抗火性能的影响。试验结果显示:采用单层网格、人工抹灰及铁丝拉结的TRC加固试件在火烧30 min后即发生TRC加固层的整体脱落;而采用喷涂施工的TRC加固试件,不论单层还是双层网格,也不论是否存在铁丝拉结锚固,均表现出了良好的抗火性能。说明喷涂施工比人工抹灰具有更好的界面黏结性能,采取的铁丝拉结锚固措施(双向间距250 mm)未能发挥作用,双层网格加固比单层加固抗火性能更好。
Seven specimens of reinforced concrete one-way slab were designed,among which six specimens were strengthened by textile reinforced concrete(TRC) and the other one was a comparison specimen without strengthening.The fire resistant behavior of concrete slabs strengthened by TRC was studied through ISO 834 standard fire test.The influence factors such as the different construction technologies(plastering,spraying),different fiber fabric layers(1 layer,2 layers) and different anchoring measures(whether the fiber mesh cloth was tied to the main structure or not) were also studied.The results show that the TRC strengthened specimens with 1 layer mesh cloth,manual plastering and wire bonding fell off after burning for 30 minutes in fire.However,the specimens strengthened by TRC with spraying construction have shown good fire-resistance performance regardless of the existence of single-layer or double-layer grids,and whether there is wire anchorage.These indicated that spraying construction has better interface bonding performance than manual plastering.The anchoring measures(the two-way spacing is 250 mm) adopted in this paper fail to play a role,and the double-layer grid reinforcement has better fire-resistance performance than that of single-layer grid.
Seven specimens of reinforced concrete one-way slab were designed,among which six specimens were strengthened by textile reinforced concrete(TRC) and the other one was a comparison specimen without strengthening.The fire resistant behavior of concrete slabs strengthened by TRC was studied through ISO 834 standard fire test.The influence factors such as the different construction technologies(plastering,spraying),different fiber fabric layers(1 layer,2 layers) and different anchoring measures(whether the fiber mesh cloth was tied to the main structure or not) were also studied.The results show that the TRC strengthened specimens with 1 layer mesh cloth,manual plastering and wire bonding fell off after burning for 30 minutes in fire.However,the specimens strengthened by TRC with spraying construction have shown good fire-resistance performance regardless of the existence of single-layer or double-layer grids,and whether there is wire anchorage.These indicated that spraying construction has better interface bonding performance than manual plastering.The anchoring measures(the two-way spacing is 250 mm) adopted in this paper fail to play a role,and the double-layer grid reinforcement has better fire-resistance performance than that of single-layer grid.
引文
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[2] Triantafillou T C,Papanicolaou C G.Shear strengthening of reinforced concrete members with textile reinforced mortar (TRM) jackets[J].Materials and Structures,2006,39(1):93-103.
[3] A.Brückner,Ortlepp R,Curbach M.Textile reinforced concrete for strengthening in bending and shear[J].Materials & Structures,2006,39(8):741-748.
[4] 荀勇,支正东,张勤.织物增强混凝土薄板加固钢筋混凝土梁受弯性能试验研究[J].建筑结构学报,2010,31(3):70-76.Xun Yong,Zhi Zhengdong,Zhang Qin.Experimental research on flexural behavior of reinforced concrete beams strengthened with textile reinforced concrete sheets[J].Journal of Building Structures,2010,31(3):70-76.(in Chinese)
[5] 周芬,徐文,杜运兴.TRC板增强钢筋混凝土梁的抗弯性能[J].中南大学学报(自然科学版),2018,49(1):183-191.Zhou Fen,Xu Wen,Du Yunxing.Flexural behavior of RC beams strengthened with TRC plates[J].Journal of Central South University (Science and Technology),2018,49(01):183-191.(in Chinese)
[6] 方李靖.TRC加固受火后钢筋混凝土板的受力性能研究[D].上海:同济大学,2015.Fang Lijing.Researches on the mechanics of reinforced concrete slabs strengthened with TRC after fire[D].Shanghai:College of Civil Engineering of Tongji University,2015.(in Chinese)
[7] 王玉珏.CFRP及TRM加固受火后预应力混凝土空心板受力性能研究[D].上海:同济大学,2015.Wang Yujue.Study on the performance of prestressed concrete hollow core slabs strengthened with CFRP and TRM after fire[D].Shanghai:College of Civil Engineering of Tongji University,2015.(in Chinese)
[8] 夏静,胡克旭,方李靖.基于MATLAB语言的TRC加固受火后钢筋混凝土板的承载力分析方法[J].四川建筑科学研究,2017,43(2):65-69.Xia Jing,Hu Kexu,Fang Lijing.Capacity analysis method of fire-damaged RC slabs strengthened with TRC based on MATLAB[J].Sichuan Building Science,2017,43(2):65-69.(in Chinese)
[9] 中华人民共和国住房和城乡建设部.GB 9978—2008 建筑构件耐火试验方法[S].北京:中国标准出版社,2008.Ministry of Housing and Urban-Rural Construction of the People’s Republic of China.GB 9978—2008 Fire resistance test methods for building components[S].Beijing:China Standard Press,2008.(in Chinese)