Optical Distributed Sensor Interrogator

在建筑工程中，建筑物和构筑物是在工程模型和附加施工规则的基础上设计的。为了推导计算模型，例如基于物理的工程模型，并验证非线性有限元模型，需要精确了解结构部件的载荷传递和相应的变形。在这些分析中，通常进行实验测试。除了外加荷载和挠度外，结构钢、钢筋和混凝土中的应变也高度相关。对于应变测量，通常使用应变片获得局部值或使用位移传感器记录平均值。局部应变测量严格限制了改进现有工程模型和验证非线性有限元模型的可能性。因此，结构混凝土研究所，结构分析和动力学主席以及钢结构研究所将获得光纤测量系统。有了这种设备，可以用改进的数据进行连续应变测量。通过胶合玻璃纤维，可以测量结构部件（例如由钢筋或预应力混凝土以及钢复合结构制成）内部和表面的应变。此外，该系统首次允许测量纤维复合材料的应变，例如由混凝土中的碳纤维增强聚合物制成的织物。到目前为止，由于在应用应变片时缺乏空间和截面弱化，这些测量很难执行。此外，光纤测量系统可以大大简化现有结构的测量，从而可以确保更精确地预测使用寿命。光纤系统的连续测量提供了一个新的分辨率和细节维度，允许更深入地了解实际负载传递机制。这种详细的应变测量是有针对性地推导物理模型的良好基础。虽然已经有许多良好的基于物理的模型，但可以预期的是，许多模型将被重新考虑并使用这种测量技术进一步开发。由于采用光纤测量系统，可以省去许多应变片昂贵的附件。

In construction engineering, buildings and structures are designed on the basis of engineering models and additional construction rules. To derive calculation models, such as physically-based engineering models and to validate non-linear finite element models, precise knowledge of the load transfer and the corresponding deformations of structural components is required. In these analyses, usually, experimental tests are carried out. Besides the applied load and deflections, the strains in structural steel, reinforcing steel and concrete are highly relevant. For strain measurements, usually local values are obtained using strain gauges or averaged values are recorded using displacement transducers. Local strain measurements strictly limit the possibilities to improve existing engineering models and to validate non-linear finite element models. Therefore, a fibre optic measurement system is to be acquired by the Institute of Structural Concrete, the Chair of Structural Analysis and Dynamics as well as the Institute of Steel Construction. With this equipment a continuous strain measurement with improved data is possible. By means of glued glass fibres, strains inside and on the surface of structural components (for example made of reinforced or prestressed concrete as well as steel composite constructions) can be measured. In addition, the system allows for the first time to measure strains of fiber composite materials, such as fabrics made of carbon fibre reinforced polymer in concrete. Until now, these measurements are difficult to perform due to lack of space and weakening of the cross-section during application of strain gauges. Moreover, the fibre optic measurement system can significantly simplify measurements on existing structures, so that a more precise prediction of the service life can be ensured. Continuous measurements with fibre optic systems provide a new dimension of resolution and detail, allowing significantly deeper insights into actual load transfer mechanisms. Such detailed strain measurements are an excellent basis for the targeted derivation of physically-based models. Although there are already many good physically based models, it is to be expected that many models will be reconsidered and further developed using this measurement technology. Due to fiber optic measurement system, the costly and expensive attachment of many strain gauges can be omitted.