Experimental Study of Normal- and High-Strength Concrete Confined with Fiber-Reinforced Polymers
Experimental Study of Normal- and High-Strength Concrete Confined with Fiber-Reinforced Polymers
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DOI：
10.1061/(asce)cc.1943-5614.0000116
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发表时间：
2010-09-01
影响因子：
4.6
通讯作者：
Sheikh, S. A.
中科院分区：
文献类型：
--
作者：
Cui, C.;Sheikh, S. A.
在此报道的实验项目是为了深入了解纤维增强聚合物（FRP）约束混凝土的性能。总共对112个圆柱形混凝土试件进行了单调单轴压缩试验，每个试件直径为150毫米，高度为300毫米，混凝土强度高达112兆帕。试验变量包括FRP的用量、FRP的强度和刚度、混凝土强度以及加固时混凝土的状况。结果表明，随着无约束混凝土强度的增加，FRP套箍在破裂时的强度增强、能量吸收能力、延性系数以及功（能量）指数均显著下降。发现混凝土延性与FRP断裂应变之间呈正相关。在多伦多大学先前对FRP约束混凝土柱进行的试验中观察到的试件峰值后逐渐破坏的现象，在当前的一些试验中也有观察到。这种延性破坏归因于FRP套箍的逐渐拉开破坏，它与试件尺寸有关，并根据各种约束参数进行了解释。
The experimental program reported here was conducted to gain insight into the behavior of concrete confined with fiber-reinforced polymers (FRPs). A total of 112 cylindrical concrete specimens, each 150 mm in diameter, 300 mm in height, and concrete strength up to 112 MPa, were tested under monotonic uniaxial compression. Test variables included amount of FRP, strength and stiffness of FRP, concrete strength, and the health of concrete at the time of strengthening. Results showed that, with an increase of the unconfined concrete strength, the strength enhancement, energy absorption capacity, ductility factor, and work (energy) index at rupture of FRP jackets all decreased remarkably. A positive correlation was found between concrete ductility and FRP rupture strain. A gradual post-peak failure of the specimens, observed previously from FRP-confined concrete columns tested at the University of Toronto, was also observed in some of the current tests. This ductile failure, attributed to the gradual unzipping failure of FRP jacket, is related to specimen size and is explained in terms of various confinement parameters.