2005•Journal of Hunan UniversityRequires access
Ultimate Strength of High Strength Concrete Columns Reinforced with Concrete Filled Steel Tube Under Axial Compression and their Reliability Analysis
Zhouyi Chen, YI Wei-jian
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Abstract
This paper aims at developing a rational design formula to predict the ultimate strength of high strength concrete columns reinforced with concrete filled steel tube (HSCCRST) under axial compression. In order to investigate the failure mode and the ultimate strength of the columns under axial compression, experimental tests of 13 specimens under axial compression were performed. Test results showed that the longitudinal strain of the steel tube, the longitudinal reinforcement, and the concrete in the column were all compatible under loading until the load applied was close to the ultimate load. Therefore, the ultimate strength of HSCCRST could be calculated in the principle of superposition. In addition, the reliability level of the columns under axial compression designed following the proposed formula was investigated. Analysis results indicated that the reliability indexes of the columns designed following the proposed formula satisfied the demand of Unified Standard for Reliability Design of Building Structures (GB 50068-2001), National Standard of the People's Republic of China.