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Experimental study on flexural behavior of ecc/rc composite beams with U-shaped ECO permanent formwork

Frontiers of Structural and Civil Engineering 2019年第5期13卷 1271-1287页

作者： Zhi QIAO Zuanfeng PAN Weichen XUE Shaoping MENG Key Laboratory of Concrete & Prestressed Concrete Structures of the Ministry of Education Southeast UniversityNanjing 210096China College of Civil Engineering Tongji UniversityShanghai 200092China School of Civil Engineering Southeast UniversityNanjing 210096China

To enhance the durability of a reinforced concrete structure, engineered cementitious composite (ecc), which exhibits high tensile ductility and good crack control ability, is considered a promising alternative to conventional concrete. However, broad application of ecc is hindered by its high cost. This paper presents a new means to address this issue by introducing a composite beam with a U-shaped ecc permanent formwork and infill concrete. The flexural performance of the ecc/rc composite beam has been investigated experimentally with eight specimens. According to the test results, the failure of a composite beam with a U-shaped ecc formwork is initiated by the crushing of compressive concrete rather than debonding, even if the surface between the ecc and the concrete is smooth as-finished. Under the same reinforcement configurations, ecc/rc composite beams exhibit increases in flexural performance in terms of ductility, load-carrying capacity, and damage tolerance compared with the counterpart ordinary rc beam. Furthermore, a theoretical model based on the strip method is proposed to predict the moment-curvature responses of ecc/rc composite beams, and a simplified method based on the equivalent rectangular stress distribution approach has also evolved. The theoretical results are found to be in good agreement with the test data.

关键词： engineered cementitious composite (ecc) durability ecc/rc composite beam permanent formwork flexural performance theoretical method

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