光纤光栅传感器在大体积混凝土基础温度监测中的应用

光纤光栅传感器具有体积小、质量轻、灵敏度高、耐腐蚀、抗电磁干扰、传输频带较宽、易于进行分布式测量等诸多其他传感器所不具备的优点,更适用于现场的长期健康监测。大体积混凝土在施工过程中的温度问题如处理不当将会引起混凝土开裂。利用温度计、热电耦等作为传感器的传统的检测手段已经大大的制约了数据的准确性与精度。寻求一种高精度温度检测手段已经成为用于现场结构监测的前提。本文结合具体的工程实例介绍了光纤光栅传感器在基础混凝土温度监测中的应用,介绍了监测系统的组成,传感器的构造和标定,并利用实测温度预测基础混凝土底板中温度应力,及时采取措施防止混凝土的开裂。

The Application of the Fiber Bragg Grating Sensors in the Temperature Monitoring of the Large Volume Concrete Foundation

The Fiber optic sensor is a new-type sensor that has been developed in recent years. An optical fiber sensor is characterized by light weight, small volume, high sensitive, anticorrosion, against electric-magnetic wave, wide transmission frequency band and could be designed in distributed way, which the other sensors do not have. So it is suitable for the health monitoring in a long period. Utilizing the traditional sensors such as thermometer, thermoelectric coupling which would restrict the accuracy and precision of the gathered data. Seeking for one kind of high accuracy temperature detection means has already become the premise of the on-the-spot structure monitoring. This paper presents a case study of the application of Fiber Bragg Grating sensors in basic concrete temperature monitoring of a mat foundation construction of a tall building. According to the temperature monitoring results, a more severe isolation method is proposed during the curing period of the mat foundation, preventing the formation of the temperature cracks in the mat.