Bend-strength of novel filament wound shear reinforcement
Bend-strength of novel filament wound shear reinforcement
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DOI：
10.1016/j.compstruct.2017.05.032
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发表时间：
2017-09
影响因子：
6.3
通讯作者：
S. Spadea;J. Orr;K. Ivanova
中科院分区：
文献类型：
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作者：
S. Spadea;J. Orr;K. Ivanova
纤维增强聚合物（FRP）丝束缠绕纵向钢筋提供了一种新的方法来制作钢筋笼。使用这种技术可以制造复杂几何形状的内部钢筋，这对于优化混凝土梁的施工是一个特别的优势。FRP对混凝土构件抗剪承载力的贡献的一个关键限制是在拐角处，在拐角处不同方向的应力集中会导致过早破坏。开发了一种新的测试方法，以允许快速测试样品以及在施加载荷期间重新对准样品，减少制造过程中产生的偏心和缺陷的影响。一个实验程序，包括30个测试样本，进行评估纤维缠绕玻璃钢（W-FRP）的抗剪连接件的弯曲能力，使用碳丝束浸渍环氧树脂。一个固定的弯曲半径为5毫米和六个非圆形的纤维横截面积具有不同的宽度-厚度比被认为是。此外，18个样品进行了测试，以测量直钢筋的拉伸性能。测试结果表明，W-FRP剪力连接表现出改善弯曲强度相比，传统的箍筋与圆形截面（高达+53%），作为一个更大的宽度-厚度比的钢筋提供了更多的强度为给定的横截面面积。W-FRP弯曲强度的测试结果和预测之间的良好的相关性进行了观察时，试样被建模为一个集合的转换的个人圆形截面。
The winding of Fibre Reinforced Polymer (FRP) tows around longitudinal reinforcing bars provides a novel method for the fabrication of reinforcement cages. Complex geometries of internal reinforcement can be fabricated using this technique, a particular advantage for the construction of optimised concrete beams.A key limitation on the contribution of FRP to the shear capacity of a concrete member is found at corners, where the presence of stress concentrations in different directions can lead to premature failure. A new test methodology was developed to allow for rapid testing of the samples as well as sample re-alignment during load application, reducing the effects of eccentricities and imperfections created during their fabrication. An experimental program, comprising 30 test samples, was undertaken to assess the bend capacity of filament wound FRP (W-FRP) shear links manufactured using a carbon tow impregnated with epoxy resin. A fixed bend radius of 5 mm and six non-circular fibre cross sectional areas having different width-thickness ratios were considered. Additionally, 18 samples were tested to measure the tensile properties of the straight reinforcement.The test results indicate that W-FRP shear links exhibit improved bend strength as compared to conventional stirrups with circular sections (up to +53%), as a larger width-thickness ratio of the reinforcement provided more strength for a given cross sectional area. A good correlation between the test results and predictions of the W-FRP bend strength was observed when the specimens were modelled as a collection of transformed individual circular sections.