Study on Load-Carrying Properties of Inclined Section of Reactive Powder Concrete Beam Under Fire
YAN Kai1,2,*, ZHANG Qian1,2, HUANG Binchao1,2, ZHANG Xin1,2
1 School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China 2 Key Laboratory of Building Structural Retrofitting and Underground Space Engineering (Shandong Jianzhu University), Ministry of Education, Jinan 250101, China
Abstract: In order to find out the degradation law of the bearing capacity of the inclined section of reactive power concrete (RPC) beams under fire, six RPC simply supported beam specimens were designed and made, and ISO834 standard fire tests were carried out under dead load. Data such as time-displacement curve, load-displacement curve, internal temperature variation, crack development, failure pattern and high temperature bursting were obtained. The influences of shear-span ratio, load level, hoop ratio and longitudinal reinforcement ratio on the bearing performance of RPC beam in oblique section under fire were analyzed. The results show that the shear span ratio and load level are the key factors affecting the fire resistance limit of RPC beam. When the shear span ratio increases from 2.5 to 3.5 and the load level increases from 0.25 to 0.45, the fire resistance limit of RPC beam can be reduced for more than 30 min. The stirrup ratio has a significant effect on the oblique bearing capacity and fire resistance limit of RPC beams. The reinforcement ratio of longitudinal reinforcement has little influence on the fire resistance limit of RPC beams. Fire high temperature and burst weakened the oblique section bearing capacity of RPC beams. The burst caused the internal materials to be directly subjected to fire, which accelerated the deterioration of mechanical properties and reduced the oblique section bearing capacity of beams by more than 33.5%. The research results can provide reference for the bearing safety of oblique section of RPC beam under fire and the reinforcement and repair after fire.
1 Kou J L,Liu Y H, Zhang H B. Building Structure, 2018, 48(2), 47 (in Chinese). 寇佳亮, 刘云昊, 张浩博. 建筑结构, 2018, 48(2), 47. 2 Wang D C,Shi C J, Wu L M. Bulletin of the Chinese Ceramic Society, 2016, 35(1), 141 (in Chinese). 王德辉, 史才军, 吴林妹. 硅酸盐通报, 2016, 35(1), 141. 3 Shao X D, Fan W,Huang Z Y. China Civil Engineering Journal, 2021, 54(1), 1 (in Chinese). 邵旭东, 樊伟, 黄政宇. 土木工程学报, 2021, 54(1), 1. 4 Zheng W Z, Lu S S, Zhang M H. Journal of Building Structures, 2009, 30(3), 62 (in Chinese). 郑文忠, 卢姗姗, 张明辉. 建筑结构学报, 2009, 30(3), 62. 5 Peng G F, Niu X J, Cheng L. Materials Reports, 2017, 31(23), 17 (in Chinese). 朋改非, 牛旭婧, 成铠. 材料导报, 2017, 31(23), 17. 6 Kodur V R. In: Proceedings of ASCE Structures Congres. Philadelphia, 2000, pp. 1. 7 Zheng W Z, Wang R, Wang Y. Journal of Building Structures, 2014, 35(9), 107 (in Chinese). 郑文忠, 王睿, 王英. 建筑结构学报, 2014, 35(9), 107. 8 Jin L Z, Wang L, Zhang Y,et al. Journal of Huaqiao University (Natural Science), 2018, 39(3), 365 (in Chinese). 金凌志, 王龙, 张毅, 等. 华侨大学学报(自然科学版), 2018, 39(3), 365. 9 Lim W Y, Hong S G. International Journal of Concrete Structures and Materials, 2016, 10(2), 177. 10 Kamal M M, Safan M A, Etman Z A, et al. HBRC Journal, 2014, 10(1), 55. 11 Deng Z C, Chen C S, Chen X W. China Civil Engineering Journal, 2015, 48(5), 51 (in Chinese). 邓宗才, 陈春生, 陈兴伟. 土木工程学报, 2015, 48(5), 51. 12 Hou X M, Ren P F, Rong Q. Engineering Structures, 2019, 185, 122. 13 Li L. Mechanical behavior and design method for reactive powder concrete beams. Ph.D. Thesis, Harbin Institute of Technology, China, 2010 (in Chinese). 李莉. 活性粉末混凝土梁受力性能及设计方法研究. 博士学位论文, 哈尔滨工业大学, 2010. 14 Zhang P. Study on oblique section shear-bearing capacity of RPC beam based on softened truss theory. Ph.D. Thesis, Beijing Jiaotong University, China, 2011 (in Chinese). 张浦. 基于软化桁架理论的RPC梁斜截面抗剪承载能力研究. 博士学位论文, 北京交通大学, 2011. 15 State General Administration of the People's Republic of China for Quality Supervision and Inspection and Quarantine, Standardization Administration of China. Fire-resistance tests-elements of building construction, Standards Press of China, China, 2008, pp.14 (in Chinese). 中华人民共和国国家质量监督检验检疫总局, 中国国家标准化管理委员会.建筑构件耐火试验方法, 中国标准出版社, 2008, pp. 14. 16 Zheng W Z, Hou X M, Yan K. High temperature performance and fire resistance design of prestressed concrete, Harbin Institute of Technology Press, China, 2013 (in Chinese). 郑文忠, 侯晓萌, 闫凯.预应力混凝土高温性能及抗火设计, 哈尔滨工业大学出版社, 2013. 17 Zheng W Z, Luo B F, Wang Y. Construction and Building Materials, 2013, 41, 844.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2024, Vol. 38 
