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首页> 外文期刊>Journal of Civil Engineering and Management >THE CONFINEMENT OF CONCRETE IN COMPRESSION USING CFRP COMPOSITES - EFFECTIVE DESIGN EQUATIONS
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THE CONFINEMENT OF CONCRETE IN COMPRESSION USING CFRP COMPOSITES - EFFECTIVE DESIGN EQUATIONS

机译：CFRP复合材料在压缩混凝土中的约束-有效设计方程

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摘要

This paper presents the results of an experimental study on the behaviour of axially loaded short concrete columns, with different cross sections that have been externally strengthened with carbon fibre-reinforced polymer (CFRP) sheets. Six series, forming the total of 60 specimens, were subjected to axial compression. All the test specimens were loaded to failure in axial compression and investigated in both axial and transverse directions. According to the obtained test results, FRP-confined specimen failure occurs before the FRP reached the ultimate strain capacities. Thus, the failure occurs prematurely and the circumferential failure strain is lower than the ultimate strain obtained from the standard tensile testing of the FRP composite. In existing models for FRP-confined concrete, it is commonly assumed that the FRP ruptures when the hoop stress in the FRP jacket reaches its tensile strength from either flat coupon tests, which is herein referred to as the FRP material tensile strength. This phenomenon considerably affects the accuracy of the existing models for FRP-confined concrete. On the basis of the effective lateral confining pressure of the composite jacket and the effective circumferential FRP failure strain, new equations were proposed to predict the strength of FRP-confined concrete and corresponding strain for each of the cross section geometry used, circular and square. The estimations given by these equations were compared with the experimental ones and general conclusions were drawn.
机译：本文介绍了对碳纤维增强聚合物（CFRP）板在外部加固的具有不同横截面的轴向短混凝土柱的性能进行实验研究的结果。对六个系列（共形成60个样本）进行轴向压缩。所有测试样品均在轴向压缩时失效，并在轴向和横向方向上进行研究。根据获得的测试结果，在FRP达到极限应变能力之前，发生了FRP约束的试样破坏。因此，破坏过早地发生并且周向破坏应变低于从FRP复合材料的标准拉伸试验获得的极限应变。在现有的FRP约束混凝土模型中，通常假设FRP护套中的环向应力通过任一平坦试块测试达到其拉伸强度时FRP破裂，在此称为FRP材料拉伸强度。这种现象极大地影响了FRP约束混凝土现有模型的准确性。基于复合材料护套的有效侧向约束压力和有效的周向FRP破坏应变，提出了新的方程式来预测FRP约束混凝土的强度以及所使用的每种横截面几何形状（圆形和正方形）的对应应变。将这些方程式给出的估计值与实验值进行比较，得出一般结论。

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