Materials Reports  2021, Vol. 35 Issue (z2): 194-199 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
|
|
|
|
|
| Research on Axial Compression Performance of Corroded RC Columns Strengthened with UHPC Based on DIC |
| SU Hao1,2, YANG Jun 1,2,3, ZHOU Jianting1,2, WANG Jieyun3, WANG Zongshan2,MA Xinglin2
|
1 State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
3 Guangxi Communications Design Group Co., Ltd., Nanning 530029, China |
|
|
|
|
Abstract In order to study the mechanical properties, bearing capacity improvement and failure mode of corroded reinforced concrete columns streng-thened by UHPC, a total of 8 specimens were designed. All specimens were corroded by electrochemical method, and then some specimens were strengthened by UHPC. Finally, the axial compression failure tests were carried out on the test columns with corrosion rates of 10%, 20% and 30% respectively by using the control variable method, DIC technology was used to observe the whole field strain changes of the specimens, and the strain nephogram, ultimate bearing capacity, peak strain and other parameters were compared and analyzed. The results show that the failure mode of the unreinforced specimens is closer to brittle failure with the increase of corrosion rate, and the failure mode of the strengthened columns is mainly split failure of UHPC strengthened layer; After reinforced, the ultimate bearing capacity of the specimens increases by 119% to 128%. When the specimens are damaged, there is only one main crack, and the integrity and crack resistance are improved; After reinforcement, DIC strain nephogram is more uniform and strain concentration appears earlier, which is more conducive to crack development prediction.
|
|
Published: 09 December 2021
|
|
|
About author:: Yang Jun doctor of engineering, master tutor, teacher of the School of Civil Engineering, Chongqing Jiaotong University, is currently a researcher of the State Key Laboratory of Bridge and Tunnel Engineering in the Mountainous Areas, and is mainly engaged in bridge engineering related teaching and research work, research direction including: strengthening old bridges and improving the performance of engineering structures; new bridge structures and ultra-high performance concrete (UHPC) materials. Published 14 papers, including 5 papers by the first author SCI/EI, presided over 1 project of the National Natural Science Foundation of China, 1 science and technology project of the Chongqing Municipal Education Commission, and 1 project of the Chongqing Science and Technology Association.
Su Hao, a master student, studied at Chongqing Jiaotong University in September 2019. Mainly engaged in the research of the application field of UHPC in bridge engineering. |
|
|
1 刘博宇, 田宇, 韩雪. 建筑与预算, 2012(3),131.
2 邵旭东,邱明红,晏班夫,等. 材料导报, 2017, 31(23),33.
3 Huiwen Tian, Zhen Zhou, Yi Zhang,et al. Engineering Structures, 2020, 210(7), 110403.
4 Mahsa Farzad, Amir Sadeghnejad, Siavash Rastkar,et al. Engineering Structures, 2020, 209, 109928.
5 Yanhua Liu, Lei Zeng, Sheng Xiang,et al. Construction and Building Materials, 2020, 260, 119883.
6 Yamaguchi I. Journal of corrosion Physics(E): Scientific Instruments, 1981, 14(5), 1270.
7 Dongyang Li, Peiyan Huang, Zhanbiao Chen,et al. Engineering Fracture Mechanics, 2020, 235, 107116.
8 冉文兴,周建庭,李晓庆,等.混凝土, 2019 (3), 60.
9 Sheikh S A U Z M. Journal of Structural Division, 1982, 12(108), 2703.
10 方小丹, 林斯嘉.建筑结构学报, 2014, 35(4), 236.
11 Mander J B P M J N. Journal of Structural Engineering, 1988, 114(8),1 804.
12 雷国强. 锈蚀钢筋混凝土偏心受压柱承载力试验研究. 硕士学位论文, 湖南大学, 2007.
13 惠云玲, 李荣, 林志伸, 等,工业建筑, 1997(6), 15.
14 钱稼茹, 程丽荣, 周栋梁, 等,清华大学学报(自然科学版), 2002(10), 1369. |
|
|
|
渝公网安备50019002502923号 © Editorial Office of Materials Reports.
