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论文类型：期刊论文
发表时间：2012-10-01
发表刊物：THIN-WALLED STRUCTURES
收录刊物：SCIE、EI、Scopus
卷号：59
页面范围：1-10
ISSN号：0263-8231
关键字：Recycled aggregate concrete-filled steel tube (RACFST); Stub columns; High temperatures; Ultimate strength; Elastic modulus
摘要：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 degrees C, 600 degrees C and 800 degrees 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. (C) 2012 Elsevier Ltd. All rights reserved.