Abstract
Image-based displacement measurement techniques are widely used for sensing the deformation of structures, and plays an increasing role in structural health monitoring owing to its benefit of non-contacting. In this study, a non-overlapping dual camera measurement model with the aid of global navigation satellite system (GNSS) is proposed to sense the three-dimensional (3D) displacements of high-rise structures. Each component of the dual camera system can measure a pair of displacement components of a target point in a 3D space, and its pose relative to the target can be obtained by combining a built-in inclinometer and a GNSS system. To eliminate the coupling of lateral and vertical displacements caused by the perspective projection, a homography-based transformation is introduced to correct the inclined image planes. In contrast to the stereo vision-based displacement measurement techniques, the proposed method does not require the overlapping of the field of views and the calibration of the vision geometry. Both simulation and experiment demonstrate the feasibility and correctness of the proposed method, heralding that it has a potential capacity in the field of remote health monitoring for high-rise buildings.
Highlights
With the rapid development of the global economy and construction technology, the construction of high-rise structures, such as civil buildings, industrial chimneys and towers, has maintained a rapid growth over the past ten years [1]
Monitoring the 3D displacements of high-rise structures is of great significance for inspecting structural reliability and safety in structural health monitoring (SHM)
This section elaborates on a displacement remote ment remote sensing system that does not relies on stereo vision geometry
Summary
With the rapid development of the global economy and construction technology, the construction of high-rise structures, such as civil buildings, industrial chimneys and towers, has maintained a rapid growth over the past ten years [1]. These structures may fail due to long-term load, environmental changes, and other factors [2,3]. The overall vertical displacement of a high-rise structure is a critical indicator to reflect the structural behavior in the service period [6]. It is common to use the contact sensors for monitoring the lateral displacement of high-rise buildings [7]. Displacement meters and accelerometers are two types that are mostly used. e.g., accelerometers can effectively capture the acceleration and further allow for deriving the displacement in a specific coordinate direction
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