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首页> 外文会议>SP-230; International Symposium on Fiber-Reinforced Polymer(FRP) Reinforcement for Concrete Structures; 20051106-09; Kansas City,MI(US) >FRP Stay-in-Place Formwork for Seismic Resistant High-Strength Concrete Columns
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FRP Stay-in-Place Formwork for Seismic Resistant High-Strength Concrete Columns

机译：抗震高强度混凝土柱的FRP固定模板

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摘要

Fiber reinforced polymer (FRP) casings, in the form of stay-in-place formwork, provide an attractive alternative to conventional confinement reinforcement for concrete columns. These casings can fulfill multiple functions of; ⅰ) formwork, ⅱ) confinement reinforcement, and ⅲ) protective shell against corrosion, weathering and chemical attacks. This paper investigates the use of stay-in-place FRP formwork as concrete confinement reinforcement for HSC columns with circular and square cross-sections. Large-scale specimens with 270 mm cross-sectional dimension and up to 90 MPa concrete strength, were tested under combined axial compression and incrementally increasing lateral deformation reversals. FRP casings were manufactured from carbon fiber sheets and epoxy resin. One of the square columns was provided with internal FRP crossties, a new technique introduced by the authors, to provide well-distributed lateral restraints along the column face, thereby improving the mechanism of confinement. The results indicate that the deformation capacity of HSC columns can be improved significantly by using FRP casings. The results further indicate that the confinement effectiveness of casings of square columns is significantly affected by the corner radius of casings. Confinement efficiency of these casings improves with the use of FRP crossties.
机译：留置模板形式的纤维增强聚合物（FRP）套管为混凝土柱的常规约束加固提供了一种有吸引力的替代方案。这些外壳可以实现以下功能： ⅰ）模板，ⅱ）隔离加强，和ⅲ）防护外壳，防止腐蚀，风化和化学腐蚀。本文研究了采用留置FRP模板作为具有圆形和正方形横截面的HSC柱的混凝土围墙加固。在组合轴向压缩和逐渐增加的横向变形反向作用下，对横截面尺寸为270 mm，混凝土强度高达90 MPa的大型试样进行了测试。玻璃钢外壳由碳纤维板和环氧树脂制成。作者介绍的一种新技术是为其中一个方柱提供内部FRP交叉，以沿柱面提供分布均匀的侧向约束，从而改善约束机制。结果表明，使用FRP套管可以显着提高HSC柱的变形能力。结果还表明，方柱套管的约束效果受套管角半径的影响很大。使用FRP枕木可以提高这些套管的封闭效率。

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