García Díaz Julián, Navarro Cano Nieves, Rúa Álvarez Edelmiro
School of Building Engineering, Universidad Politécnica de Madrid, 28040 Madrid, Spain.
School of Civil Engineering, Universidad Politécnica de Madrid, 28040 Madrid, Spain.
Sensors (Basel). 2020 Feb 10;20(3):937. doi: 10.3390/s20030937.
This article investigates the possibility of applying weldable optic fiber sensors to the corrugated rebar in reinforced concrete structures to detect cracks and measure the deformation of the steel. Arrays have initially been designed comprised of two weldable optic fiber sensors, and one temperature sensor to compensate its effect in measuring deformations. A series of tests were performed on the structures to evaluate functioning of the sensors, and the results obtained from the deformation measures shown by the sensors have been stored using specific software. Two reinforced concrete beams simply resting on the support have been designed to perform the tests, and they have been monitored in the zones with maximum flexion moment. Different loading steps have been applied to the beams at the center of the span, using a loading cylinder, and the measurement of the load applied has been determined using a loading cell. The analysis of the deformation measurements of the corrugated rebar obtained by the optic fiber sensors has allowed us to determine the moment at which the concrete has cracked due to the effect of the loads applied and the deformation it has suffered by the effect of the different loading steps applied to the beams. This means that this method of measuring deformations in the corrugated rebar by weldable optic fiber sensors provides very precise results. Future lines of research will concentrate on determining an expression that indicates the real cracking moment of the concrete.
本文研究了将可焊接光纤传感器应用于钢筋混凝土结构中的波纹钢筋以检测裂缝和测量钢筋变形的可能性。最初设计的阵列由两个可焊接光纤传感器和一个温度传感器组成，以补偿其在测量变形时的影响。对这些结构进行了一系列测试以评估传感器的功能，并且使用特定软件存储了从传感器显示的变形测量结果中获得的数据。设计了两根简支在支座上的钢筋混凝土梁来进行测试，并在最大弯矩区域进行监测。使用加载油缸在梁的跨中施加不同的加载步骤，并使用测力传感器确定所施加荷载的测量值。对光纤传感器获得的波纹钢筋变形测量结果进行分析，使我们能够确定由于施加的荷载作用混凝土开裂的时刻以及梁在不同加载步骤作用下所遭受的变形。这意味着这种通过可焊接光纤传感器测量波纹钢筋变形的方法能提供非常精确的结果。未来的研究方向将集中在确定一个表示混凝土实际开裂时刻的表达式。
