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The load-bearing behaviour of a reinforced concrete beam investigated by optical measuring techniques

机译：光学测量技术研究了钢筋混凝土梁的承载行为

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摘要

Bending beams and slabs are typical examples for structural elements used for reinforced concrete structures such as bridge girders, T-beams and bridge decks. Their strength related failure modes at maximum loading can be divided into bending and shear failure. The failure of beams loaded in bending can occur with or without indication. Therefore, conventional design concepts aim on failure modes with sufficient indication (e.g. large deflections or cracks), as it occurs in the case of secondary flexural compression failure. These indicating factors can also be used for Structural Health Monitoring (SHM) of civil infrastructure systems (e.g. bridges) to identify structural changes. In this context, non-destructive testing (NDT) methods offer different techniques for measuring deflections or crack formation and opening. However, profound knowledge on the determining failure modes of bending beams and their detection by NDT methods is required for the reliable application of SHM. Different NDT methods have been used in this study for analysing the load-bearing behaviour of a reinforced concrete beam in bending. The different measuring techniques are briefly described and their applicability is discussed by means of experimental results. For this purpose, the load-bearing behaviour of a reinforced concrete beam having a span of 2.75 m was investigated in a four-point bending flexural test at laboratory scale. The focus is on the characterization of determining failure modes by optical NDT and the comparison with classical measuring techniques (e.g. deformation measurements by displacement transducers). The bending beam was equipped with two single-mode (SM) sensor fibres. One fibre served as Distributed Optical Fibre Sensor (DOFS), whereas the other fibre contained Fibre Bragg Grating (FBG) sensors. In addition, optical deformation measurements using Digital Image Correlation (DIC) and Stereophotogrammetry (SP) were conducted.
机译：弯曲梁和板是用于钢筋混凝土结构的结构元件的典型示例，例如桥梁梁，T梁和桥甲板。它们的强度相关的失效模式可分为弯曲和剪切失效。在弯曲中加载的光束的故障可能有或没有指示发生。因此，传统的设计概念旨在瞄准具有足够的指示（例如偏转或裂缝）的故障模式，因为它发生在二次弯曲压缩失败的情况下。这些指示因素也可用于民用基础设施系统（例如桥梁）的结构健康监测（SHM），以确定结构性变化。在这种情况下，非破坏性测试（NDT）方法提供了用于测量偏转或裂缝形成和开口的不同技术。然而，需要对弯曲梁的确定失效模式的深刻知识及其通过NDT方法检测SHM。本研究已经使用了不同的NDT方法，用于分析钢筋混凝土梁在弯曲中的承载行为。简要描述了不同的测量技术，并且通过实验结果讨论了它们的适用性。为此目的，在实验室规模的四点弯曲弯曲试验中研究了具有2.75μm的跨度为2.75μm的钢筋混凝土梁的承载行为。焦点是通过光学NDT确定测定失效模式的表征，以及与经典测量技术的比较（例如，由位移换能器的变形测量​​）。弯曲梁配有两个单模（SM）传感器纤维。一种纤维作为分布式光纤传感器（DOF），而其他光纤包含光纤布拉格光栅（FBG）传感器。另外，使用使用数字图像相关（DIC）和立体光图（SP）的光学变形测量。

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