高温喷水冷却后圆钢管再生混凝土短柱轴压性能试验及剩余承载力评估

doi:10.11896/cldb.19120097

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Abstract In order to study the axial compression performance and residual bearing capacity evaluation method of recycled concrete filled circular steel tube (RCFCST) after elevated to high temperatures and water cooling, 27 RCFCST short columns were designed for axial compression test, with the variable parameters of recycled coarse aggregate replacement percentage, temperature and cooling method considered. By the experiment, the whole mechanical process and failure mode of all specimens were observed, and stress-strain curves of specimens were obtained, and the influence of different variation parameters on peak stress, peak strain and axial displacement ductility and energy dissipation were analyzed. The performance degradation process was analyzed by combining the rigidity degradation curves of the specimen. And referring to each regulation, the residual bearing capacity of the specimen after exposure to high temperatures and water coolingwas calculated. The results indicate that with the increase of the maximum temperature, the peak stress of the specimen subjected to high temperatures and water cooling decreases significantly, but the peak strain increases gradually, and the ductility and energy dissipation are the trend of increasing first and then decreasing. With the increase of the replacement percentage of recycled aggregate, the peak stress and strain of the specimen change little, the axial displacement ductility decreases first and then increases, and the energy dissipation decreases gradually. When the temperature is higher, the peak stress, strain, ductility and energy dissipation of specimens subjected to water cooling are larger than those of natural cooling specimens. In addition, the rigidity degradation rate of water cooling specimens will slow down with the increase of the highest temperature, while the rigidity degradation rate of specimens with different replacement percentage is close, and the rigidity degradation rate of water cooling specimens is faster than that of natural cooling specimens. After theoretical analysis, it is suggested to adopt the calculation method of AIJ code of Japan, and introduce the coefficient reduction of steel tube and concrete after high temperature to evaluate the residual bearing capacity of RCFCST short columns after water cooling at high temperature.

Key words： water cooling recycled concrete filled circle steel tube axial compression performance test residual bearing capacity assessment

Published: 22 April 2021

CLC number:

TU398

Fund:National Natural Science Foundation of China (51578163), Special fund project for “Bagui” scholars ([2019]79) and the Key R & D Projects in Guangxi Province (guike AB17292083).

About author:: Zongping Chenserves in College of Civil Engineering and Architecture, Guangxi University. He is currently a professor and doctoral supervisor enjoying the special allowance from the State Council. He is national talents project candidates, the young and middle-aged expert with outstanding contributions, a winner of the national Baosteel excellent teacher award, the fifth batch of Bagui scholars in Guangxi Zhuang Autonomous Region, the ninth batch of excellent expert in Guangxi, an outstanding scholar in Guangxi universities, and an academic leader in the world-class discipline of civil engineering construction and national key discipline of structural engineering in Guangxi University. He is mainly engaged in teaching and research in structural engineering, disaster prevention and mitigation engineering and protection engineering, and he has published 150 academic papers cited by SCI and EI.
Ji Zhoureceived his bachelor's degree in June 2017 from Anhui University of Science and Technology. Since September 2017, he has studied for master's degree at Guangxi University, focusing on the research of marine and offshore concrete structures, steel and concrete composite structures

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Cite this article:

CHEN Zongping,ZHOU Ji,WANG Cheng, et al. Test on Axial Compression Performance and Residual Bearing Capacity Assessment of Recycled Concrete Filled Circular Steel Tube After Exposure to High Temperatures and Water Cooling[J]. Materials Reports, 2021, 35(7): 7033-7041.

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http://www.mater-rep.com/EN/10.11896/cldb.19120097 OR http://www.mater-rep.com/EN/Y2021/V35/I7/7033

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