基于长标距FBG应变传感器的筒仓拆除实时监测

为确保大连华能混凝土筒仓在物理开凿拆除过程中施工人员和施工机械的安全,设计了长标距光纤光栅(FBG)应变传感器进行全过程实时监测。通过对传感器采集的应变数据进行静力和动力分析,得到筒仓结构表面应变和固有频率随开孔率的变化情况,进而对结构损伤情况进行识别。在混凝土筒仓监测过程中,该传感器运行稳定,获得了整个拆除过程中结构应变响应数据,并对结构倒塌做出预警,混凝土筒仓成功按照预定方位倒塌。此研究成果解决了传统拆除作业中的盲目性及安全措施延时被动的问题,为同类混凝土拆除工作提供了重要的技术参考。

Real time Monitoring of Silo Demolition Based on Long gauge FBG Strain Sensor

In order to ensure the safety of constructors and construction machinery in the process of physical excavation and demolition of Dalian Huaneng concrete silo, a long gauge fiber Bragg grating (FBG) strain sensor was designed to monitor the whole process in real time. Through the static and dynamic analysis of the strain data collected by sensors, the variation of the surface strain and natural frequency of the silo structure with the opening rate was obtained, and then the structural damage was identified. During the monitoring of the concrete silo, the sensor operated steadily, the structural strain response data during the whole demolition process was obtained, and an early warning of structural collapse was given. The concrete silo collapsed successfully according to the predetermined direction. The research results have solved the problems of blindness and passive delay of safety measures in traditional demolition work and provided an important technical reference for similar concrete demolition work.