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Shear Capacity of FRP Stirrups in FRP-Reinforced Concrete Beams Based on Genetic Algorithms Approach

机译:基于遗传算法的FRP筋混凝土梁中FRP箍筋的抗剪承载力

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Current shear design guidelines propose that the nominal shear capacity ofconcrete beams reinforced with fibre-reinforced polymer (FRP) can be calculated using existingshear design equations for steel-reinforced concrete beams provided that the axial rigidity of FRPlongitudinal bars and the capacity of FRP stirrups at the bent portions are accounted for.However, they noticeably vary in the manner they account for concrete contribution to shear aswell as the shear capacity of FRP stirrups. This paper presents a simple yet more accurateequation to determine the shear capacity of FRP stirrups in FRP-reinforced concrete beams basedon genetic algorithms approach. The shear capacity of FRP stirrups calculated using theproposed equation is compared to those obtained using equations provided by four commonlyused shear design guidelines for FRP reinforced concrete beams, namely the ACI 440, CSAS806, JSCE, and ISIS Canada. Results show that current guidelines overestimate the capacity ofFRP stirrups and that such capacity is best represented by a square root function of the stirrupsultimate capacity rather than a linear function as proposed by the guidelines. The shear capacityof FRP stirrups calculated using the proposed equation are in better agreement with availableexperimental data than those calculated using shear equations recommended by currentguidelines.
机译:当前的剪切设计指南建议,标称剪切能力为 可以使用现有的方法来计算用纤维增强聚合物(FRP)增强的混凝土梁 钢筋混凝土梁的抗剪设计方程式假定FRP的轴向刚度 考虑了纵向钢筋和在弯曲部分的FRP箍筋的能力。 但是,它们在解释混凝土对剪切的贡献方面的方式明显不同。 以及玻璃钢箍筋的剪切能力。本文提出了一个简单而又准确的方法 FRP加固混凝土梁中FRP箍筋的抗剪承载力的方程 关于遗传算法的方法。 FRP箍筋的抗剪承载力用 将建议的方程与使用四个常用方程式获得的方程进行比较 FRP钢筋混凝土梁使用的剪切设计准则,即ACI 440,CSA S806,JSCE和ISIS加拿大。结果表明,当前的准则高估了 FRP箍筋,这种能力最好用箍筋的平方根函数表示 极限容量,而不是指南建议的线性函数。剪切能力 用建议的方程式计算的FRP箍筋的数量与现有的更好 实验数据比使用当前推荐的剪切方程式计算得到的数据要高 准则。

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