【摘要】 光纤布拉格光栅(FBG)传感器凭借其体积小、灵敏度高、耐腐蚀、抗电磁干扰、分布或者准分布式测量、可实现远距离的监测与传输等优点,在土木工程健康监测中得到日益广泛的应用。本文在光纤布拉格光栅(FBG)传感器的传感原理、标定试验研究基础上,讨论了利用FBG传感系统监测钢架结构在冲击荷载作用下的应变和加速度的可行性;同时利用ANSYS有限元分析软件建立了适用于结构分析的有限元模型,对钢架结构进行了详细的仿真分析计算,最后对理论计算结果及实测结果进行了详细的对比分析,所取得的结果比较接近。研究表明,光纤布拉格光栅传感器可以很好的测量钢架结构的动态响应。更多还原

【Abstract】 Fiber Bragg grating(FBG) sensors present a great deal of potential in monitoring the structural due to their advantages such as immunity to electromagnetic interference,light weight,small size,multiplexing capabilities,ease of installation and durability.In this paper,the sensing principle is explained at first, and the strain transferring character is conducted in the calibration experiment on the steel plate using universal testing machine,then the research work focus on the dynamic strain measurement and natural frequencies of a steel frame with three stories using a FBG sensing system through experimental and numerical calculation.Two FBG strain sensors were designed and mounted on the steel frame. In a series of impact loading experiments,the data measured by FBG sensors were collected throughout a commercial FBG wavelength interrogation system.The comparison of experimental and numerical results revealed that the FBG sensors have ability of measurement of the dynamic strain of the steel frame structure in real time.更多还原