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

查看全文 作　　者：Zhi [1]QIAO;Zuanfeng [1,2]PAN;Weichen [2]XUE;Shaoping [3]MENG 高影响力作者 机构地区：[1]Key Laboratory of Concrete & Prestressed Concrete Structures of the Ministry of Education,Southeast University,Nanjing 210096,China;[2]College of Civil Engineering,Tongji University,Shanghai 200092,China;[3]School of Civil Engineering,Southeast University,Nanjing 210096,China高影响力机构 出　　处：《Frontiers of Structural and Civil Engineering》索引2019年第13卷第5期,共17页高影响力期刊 基　　金：The authors acknowledge the funding supports of National Key Research and Development Plan, China (2016 YFC0701400, 2017YFC1500700);the National Natural Science Foundation of China (Grant No. 51778462). 摘　　要：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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