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A deformation monitoring method of ancient wooden beam based on FBG strain measurement

JIANG Shaofei;TANG Weijie;WU Minghao;SHEN Sheng;ZHANG Ying;College of Civil Engineering,Fuzhou University;College of Architecture,Fuzhou University;  
In order to overcome the drawbacks of traditional measurement methods in the monitoring of ancient wooden beams,the paper proposes a new deformation monitoring method for ancient wooden beams based on fiber Bragg grating(FBG) strain measurement technique and the constructor method.More specifically,this proposed method takes three factors into account,i.e.,semi-rigid support located in mortise and tenon connection,support settlement and the irregular cross section of original wooden beams,and a formula is derived and presented for analyzing the deflection of ancient wooden beams.A finite element model(FEM) is built to analyze the scope of application of the proposed method in engineering; meanwhile,the proper number of sensors is recommended.Besides,the proposed method is validated by static loading test conducted on beams of a wooden frame,and the influence degree of support settlement and irregular cross section on the deformation is analyzed.The results show that the method is applicable to the ancient wooden beams of semi-rigid support,and the effect of support settlement and the irregularity of cross section can be eliminated.Moreover,the method can be applied to the deformation monitoring of ancient wooden beams whose span-depth ratios are larger than 20,and the accuracy can be met by arranging only5 FBG strain sensors in the proper places.The influence on the deformation of settlement is larger than that of irregular cross section,which is irrelevant to loading modes.
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