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首页> 外文期刊>KSCE journal of civil engineering >Size Effect in Shear Failure of High Strength Concrete Beams without Stirrup reinforced with Basalt FRP Bars
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Size Effect in Shear Failure of High Strength Concrete Beams without Stirrup reinforced with Basalt FRP Bars

机译：玄武岩FRP筋无箍筋高强混凝土梁抗剪破坏的尺寸效应。

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摘要

This study investigates the size effect in shear failure of high strength concrete beams without stirrup reinforced with basalt Fiber Reinforced Polymer (FRP) bars. The experimental works include constructing and testing twelve large-scale simply supported beams. The main considered parameters were beam depth (300, 500 and 700 mm), flexural reinforcement ratio and concrete compressive strength. The test results show that there is a considerable size effect in normalized shear strength with average reductions in shear strength of 32.8 and 43.6% when the beam effective depth was increased from 252 to 452 and 635 mm respectively. With increasing beam depth the ultimate deflection and ductility reduced substantially and the shear failure become more brittle. Comparing the experimental with predicted shear strength by seven codes and nine proposed equations from literature showed that the most accurate design equations, are those of Alam and Hussein (2013), Razaqpur and Spadea (2010), Lee and Lee (2014), and CSA (2010, 2012), however in most of the considered equations the degree of conservatism decreased with increasing beam depth. Moreover, comparing the size effect in this study with others from the literature indicated that the size effect is larger in beams reinforced with basalt FRP rebar than glass and carbon FRP rebar, however more studies are needed to confirm this.
机译：这项研究调查了无玄武岩纤维增强聚合物（FRP）筋不加箍筋的高强度混凝土梁抗剪破坏的尺寸效应。实验工作包括构造和测试十二个大型简支梁。主要考虑的参数是梁深度（300、500和700 mm），抗弯配比和混凝土抗压强度。试验结果表明，当梁的有效深度从252 mm分别增加到452和635 mm时，归一化抗剪强度具有相当大的尺寸效应，平均抗剪强度降低32.8和43.6％。随着梁深度的增加，最终的挠度和延展性大大降低，剪切破坏变得更加脆弱。通过7个编码和9个文献中提出的方程对实验与预测的剪切强度进行比较，结果表明最准确的设计方程是Alam和Hussein（2013），Razaqpur和Spadea（2010），Lee和Lee（2014）以及CSA的设计方程（2010年，2012年），但是在大多数考虑的方程中，保守度随光束深度的增加而降低。此外，将本研究中的尺寸效应与文献中的其他尺寸效应进行比较表明，玄武岩FRP钢筋增强的梁比玻璃和碳FRP钢筋的尺寸效应更大，但是需要更多的研究来证实这一点。

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