Experimental behaviour of RACFST stub columns after exposed to high temperatures |
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| Affiliation: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, People''s Republic of China;2. Liaoning Provincial Building Design and Research Institute, Shenyang, People''s Republic of China;1. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education (Harbin Institute of Technology), Harbin 150090, China;2. School of Civil Engineering, Harbin Institute of Technology, Heilongjiang, Harbin 150090, China;1. College of Architecture and Environment, Sichuan University, Chengdu 610065, PR China;2. Key Laboratory of Energy Engineering Safety and Disaster Mechanics, Ministry of Education, Sichuan University, Chengdu 610065, PR China;3. Advanced Research Institute, Chengdu University, Chengdu 610106, PR China;4. Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia;1. Henan Province Engineering Laboratory of Eco-architecture and the Built Environment, Henan Polytechnic University, Jiaozuo 454000, China;2. School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China;1. Faculty of Engineering, Amoud University, Borama, Awdal, Somalia;2. Department of Civil Engineering, Gaziantep University, 27310, Gaziantep, Turkey;1. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China;2. School of Urban Construction, Yangtze University, Jingzhou 434023, China;1. Department of Civil Engineering, Tsinghua University, Beijing 100084, PR China;2. Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China |
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| Abstract: | The experimental studies on the behaviour of recycled aggregate concrete-filled steel tube (RACFST) stub columns after exposed to high temperatures are reported in this paper. Forty specimens, including 32 RACFST stub columns and 8 normal concrete-filled steel tube (CFST) stub columns as reference, were tested, and the failure pattern, load versus strain relation and ultimate strength of the specimens were presented and analysed. Five types of concrete were produced: one reference concrete with natural aggregates, two concrete mixes with recycled coarse aggregate (RCA) replacement ratios of 50% and 100%, and two concrete mixes with recycled fine aggregate (RFA) replacement ratios of 50% and 100%. The specimens were exposed to 300 °C, 600 °C and 800 °C for 3 h. The test results showed that, due to the existence of the recycled aggregates, the post-fire performance of RACFST stub columns was lower than the corresponding normal CFST specimens under the same maximum temperature suffered, and the RACFST specimens with RCA had a better behaviour than those with RFA under the same recycled aggregate replacement ratio. |
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