Abstract
The Fiber Bragg Grating (FBG) sensing technique is suitable for a wide variety of measurements, including temperature, pressure, acceleration, liquid level, etc., and has been applied to many bridges and buildings in the past two decades. The fact that the FBG technique can only monitor and measure strain data for most cases when it is used for deformation measurements impedes application of the FBG sensing technique in civil infrastructures. This paper proposes FBG sensing-based deformation monitoring methods that are applicable to monitoring beam deflection, column inclination angle and mortise-tenon joint dislocation for Chinese traditional timber structures. On the basis of improved conjugated beam theory and geometrical trigonometric function relationship, the relationships between the FBG sensing strain values and the deflection of beam, inclination angle of column, as well as the amount of dislocation of mortise-tenon joint are deducted for Chinese traditional buildings. A series of experiments were conducted to verify the applicability and effectiveness of the proposed deformation monitoring methods. The results show that a good agreement is obtained between the values given by the methods proposed in this paper and other methods. This implies that the proposed deformation monitoring methods are applicable and effective in the health monitoring of Chinese traditional timber structures.
Highlights
There exist a huge number of ancient timber buildings and modern newly-built timber houses inChina
To maintain and protect these historical and cultural heritage buildings, and assure their safe operation, it is becoming increasingly important and urgent to monitor their daily state so as to provide alarming prior to the occurrence of damage or failure. To solve such a problem, the current timber buildings design specification of China [8] requires timely observation in either of the following cases: (1) Inclination, slanting, or twisting ever occurring in the buildings, or a slow development of these caused by uneven settlement; and (2) load-bearing members displaying significant flexural cracking or a large amount of dislocation in mortise-tenon joints
As the extension of the presented method [18], this paper aims to develop monitoring methods of beam deflection, column inclination angle and mortise-tenon joint dislocation for Chinese traditional timber buildings using Fiber Bragg Grating (FBG) sensors
Summary
To maintain and protect these historical and cultural heritage buildings, and assure their safe operation, it is becoming increasingly important and urgent to monitor their daily state so as to provide alarming prior to the occurrence of damage or failure. To solve such a problem, the current timber buildings design specification of China [8] requires timely observation in either of the following cases: (1) Inclination, slanting, or twisting ever occurring in the buildings, or a slow development of these caused by uneven settlement; and (2) load-bearing members displaying significant flexural cracking or a large amount of dislocation in mortise-tenon joints. With increasing research on novel and smart sensors [9,10,11], many scholars have gradually applied these sensors and sensing
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