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Influence of the measurement method on axial strains of FRP-confined concrete under compression

机译：测量方法对压缩状态下FRP约束混凝土轴向应变的影响

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Accurate determination of axial strains of fiber reinforced polymer (FRP)-confined concrete is of significant importance in determining the axial compressive behavior of the material. This is challenging, however, because of the fact that axial strains are often influenced by the methods used in their measurement. Two measurement methods, involving the use of linear variable differential transformers (LVDTs) either along the full-or mid-height region of the specimens, have been extensively used to measure the axial strains of FRP-confined concretes. This paper presents a targeted study investigating how the axial strains obtained from these two measurement methods compared. A complete database of FRP-confined normal-and high-strength concrete (NSC and HSC) cylinders containing both full-and mid-height LVDT (i.e. FLVDT and MLVDT) axial strain data was assembled. The analysis results of database show that axial strains obtained from FLVDT and MLVDT are close to each other in the case of NSC specimens. However, significant differences are seen in the axial strains of the HSC specimens obtained from these two measurement methods, indicating that the axial strains of HSC are highly sensitive to the instrumentation arrangement used in their measurement. It is shown that, in addition to the significant influence of the unconfined concrete strength, the lateral stiffness of FRP confinement influences the relationship between the axial strains obtained by FLVDT and MLVDT methods. Finally, with the aim of establishing a unified framework for future design and modeling efforts, an expression is developed to describe the relationship between the axial strains of FRP-confined concrete obtained by the two measurement methods.
机译：准确确定纤维增强聚合物（FRP）约束混凝土的轴向应变对确定材料的轴向压缩性能至关重要。然而，这是具有挑战性的，因为这样的事实，即轴向应变通常受其测量方法所影响。两种测量方法都涉及沿FRP约束混凝土的轴向应变，其中包括沿试样的全高或中高度区域使用线性可变差动变压器（LVDT）。本文提出了一项有针对性的研究，研究了如何比较从这两种测量方法获得的轴向应变。组装了完整的FRP约束的普通和高强度混凝土（NSC和HSC）圆柱体数据库，其中包含全高和中高度LVDT（即FLVDT和MLVDT）轴向应变数据。数据库的分析结果表明，对于NSC标本，从FLVDT和MLVDT获得的轴向应变彼此接近。然而，从这两种测量方法获得的HSC试样的轴向应变中发现了显着差异，这表明HSC的轴向应变对在其测量中使用的仪器布置高度敏感。结果表明，除了无限制混凝土强度的显着影响外，FRP约束的侧向刚度还影响通过FLVDT和MLVDT方法获得的轴向应变之间的关系。最后，为了建立统一的框架以进行未来的设计和建模工作，开发了一种表达式来描述通过两种测量方法获得的FRP约束混凝土的轴向应变之间的关系。

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