An improved conjugated beam method for structural deformation monitoring based on distributed optical fiber strain sensing technique

作者：Shen Sheng^*; Wu Zhishen; Yang Caiqian; Tang Yongsheng; Wu Gang; Wei Hongchang

来源：China Civil Engineering Journal, 2010, 43(7): 63-70.

• Beam methods
• Fiber-optic sensing
• Health monitoring
• Structural deformation
• Structural deformation monitoring

Deformation is in general the most effective indicator of unforeseen damage accumulation, though it is difficult to acquire deformation distribution using traditional "point" monitoring methods. Based on the distributed optical fiber sensing technique of pulse-prepump Brillouin Optical Time Domain Analysis (PPP-BOTDA), an improved conjugated beam method is presented for monitoring the deformation distribution of simply-supported structures and continuous structures. This method is suitable for the combined action of loads and support settlements, extending the application of the traditional conjugated beam method. Another advantage of this method is that the relationship between structural deformation and strain is linear and all calculation parameters can be easily determined without using load or section stiffness. Theoretical and experimental investigations confirm that using this method, the accuracy of deformation monitoring in one span of structure is only related to the accuracy of strain measurements in this span, a characteristics useful for avoiding the influence from strain measurement errors in other spans.

• 出版日期2010
• 单位东南大学