Axial and lateral stress-strain model for FRP confined concrete
Axial and lateral stress-strain model for FRP confined concrete
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DOI：
10.1016/j.engstruct.2015.04.046
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发表时间：
2015-09
影响因子：
5.5
通讯作者：
A. Kwan;C. Dong;J. Ho
中科院分区：
文献类型：
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作者：
A. Kwan;C. Dong;J. Ho
FRP（纤维增强聚合物）约束混凝土中的围压取决于混凝土的横向应变，但混凝土的横向应变取决于围压。因此，围压和侧向应变是相互关联的，必须同时进行评估。然而，到目前为止，这样的评估仍然是一项艰巨的任务。因此，加载过程中围限应力的变化以及FRP在加载各个阶段的围限有效性仍不完全清楚。本文开发了评估 FRP 约束混凝土中的横向应变、围压应力和轴向应力的理论模型。首先应用该理论模型对他人测试的FRP约束混凝土试件进行分析，验证其准确性，然后对围限刚度的影响进行参数化研究。基于参数研究，评估了在不同混凝土强度下实现两种不同水平的延性所需的两个最小值，以用于设计指导。
The confining stress in FRP (fiber reinforced polymer) confined concrete is dependent on the lateral strain of the concrete but the lateral strain of the concrete is dependent on the confining stress. Hence, the confining stress and lateral strain are inter-related and have to be evaluated at the same time. However, up to now, such evaluation has remained a difficult task. Consequently, the variation of the confining stress during loading and the effectiveness of the FRP confinement at various stages of loading are still not fully understood. Herein, a theoretical model for evaluating the lateral strain, confining stress and axial stress in FRP confined concrete is developed. The theoretical model is first applied to analyze the FRP confined concrete specimens tested by others to verify its accuracy and then used to perform a parametric study on the effects of confining stiffness. Based on the parametric study, the two minimum values of confining stiffness needed to achieve two different levels of ductility at various concrete strengths have been evaluated for design guidance.