Fiber-Bridging Constitutive Law of Engineered Cementitious Composites
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概要
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This paper is on modeling and measuring fiber-bridging constitutive law of Engineered Cementitious Composites (ECC), a high performance fiber-reinforced cementitious composite featuring high tensile ductility. Fiber-bridging constitutive law plays an important role in the multiple cracking behavior of ECC. Therefore, proper control of fiber-bridging behavior through tailoring material microstructure is the key to successfully designing tensile strain-hardening ECC. In this paper, an analytical fiber-bridging model of ECC which connects material constituent parameters and composite properties, built on a previous simplified version, was proposed. To improve accuracy of crack opening prediction, new mechanisms of fiber/matrix interactions, specifically fiber two-way debonding and pull-out, matrix micro-spalling, and Cook-Gordon effects were included. This revised model was compared with experimental measurement of fiber-bridging behavior and the validity of the model was confirmed. It is expected that this model will greatly improve ECC design technology in terms of steady-state crack width control, key for structural long-term durability, and in terms of composite tensile properties important for structural safety at ultimate limit state.
著者
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Wang Shuxin
Department of Mechanical Engineering Tianjin University
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Li Victor
Department Of Civil And Environmental Engineering University Of Michigan
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Yang En-hua
Department Of Anesthesiology Beijing Tiantan Hospital Capital Medical University
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Li Victor
Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan, USA.
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Yang Yingzi
Department of Civil Engineering, Harbin Institute of Technology, Harbin, China.
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Yang En-Hua
Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan, USA.
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