Influence of Matrix Ductility on Tension-Stiffening Behavior of Steel Reinforced Engineered Cementitious Composites (ECC)
Influence of Matrix Ductility on Tension-Stiffening Behavior of Steel Reinforced Engineered Cementitious Composites (ECC)
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DOI：
10.14359/11041
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发表时间：
2002
影响因子：
1.8
通讯作者：
G. Fischer;V. Li
中科院分区：
文献类型：
--
作者：
G. Fischer;V. Li
本文研究了单轴拉伸条件下结构钢筋与高性能纤维增强水泥基复合材料（HPFRCC）的相互作用。试验研究了水泥基复合材料延性对型钢混凝土变形性能的影响，并与普通钢筋混凝土进行了对比。工程水泥复合材料（ECC），一种特殊类型的HPFRCC应变硬化和多个开裂性能的脆性混凝土的替代品，已被证明提供改善的负载变形特性的钢筋混凝土抗拉强度，变形模式，和能量吸收。变形机制的分析表明，结合钢筋和ECC的结果在复合作用，其中不同的是在RC或常规FRC，两种组成材料变形相容的postcracking和postyielding变形过程中。这种变形相容性导致增强材料和复合材料基体中的应变分布更加均匀，界面粘结应力降低，并且在相对较大的非弹性复合材料变形下控制损坏。本文的研究重点是复合材料延性对钢筋混凝土变形行为的影响及其对钢筋、复合材料基体和界面粘结中应变分布的影响。
In this paper, the interaction of structural steel reinforcement and high-performance fiber-reinforced cement composites (HPFRCC) in uniaxial tension is examined. The effects of cementitious composite ductility on the steel reinforced composite deformation behavior are experimentally studied and contrasted to normal reinforced concrete (RC). The substitution of brittle concrete with an engineered cementitious composite (ECC), a particular type of HPFRCC with strain hardening and multiple cracking properties, has shown to provide improved load-deformation characteristics in terms of RC tensile strength, deformation mode, and energy absorption. Analysis of the deformation mechanisms suggests that combining steel reinforcement and ECC results in composite action, where unlike in RC or regular FRC, both constituent materials deform compatibly in the postcracking and postyielding deformation process. This deformation compatibility results in a more uniform strain distribution in reinforcement and composite matrix, reduced interfacial bond stress, and controlled damage at relatively large inelastic composite deformations. Research described here focuses on the influence of composite ductility on the deformation behavior of the RC and its effects on the strain distribution in the reinforcement, composite matrix, and interfacial bond.