Abstract
We propose a new flexible technique for accurate vision-based seismic displacement measurement of building structures via a single non-stationary camera with any perspective view. No a priori information about the camera’s parameters or only partial knowledge of the internal camera parameters is required, and geometric constraints in the world coordinate system are employed for projective rectification in this research. Whereas most projective rectifications are conducted by specifying the positions of four or more fixed reference points, our method adopts a stratified approach to partially determine the projective transformation from line-based geometric relationships on the world plane. Since line features are natural and plentiful in a man-made architectural building environment, robust estimation techniques for automatic projective/affine distortion removal can be applied in a more practical way. Both simulations and real-recorded data were used to verify the effectiveness and robustness of the proposed method. We hope that the proposed method could advance the consumer-grade camera system for vision-based structural measurement one more step, from laboratory environments to real-world structural health monitoring systems.
Highlights
Observing the vibration characteristics of building structures in a metropolitan area subjected to extreme loading with state-of-the-art sensing technologies has become a valuable method for structural safety assessments and design validations
The behavior of building structures could be evaluated in terms of two types: the acceleration response corresponding to the short period components of the external load and the displacement response corresponding to the long period components
We introduce the root mean square error (RMSE) between the image-estimated nodal coordinates in X-direction (Xi, i = 1, · · ·, N) of the structure after image rectification and the corresponding ground truth coordinates (XGi ) obtained by ANSYS in each image as follows v u u1
Summary
Observing the vibration characteristics of building structures in a metropolitan area subjected to extreme loading (e.g., earthquake) with state-of-the-art sensing technologies has become a valuable method for structural safety assessments and design validations. The behavior of building structures could be evaluated in terms of two types: the acceleration response corresponding to the short period components of the external load and the displacement response corresponding to the long period components. The monitoring of the short-term as well as of long-term responses of building structures under severe loading conditions and verifying their spectral characteristics are both of importance in many cases. Monitoring the displacement responses of structures via the double integration of accelerations is always problematic due to the nature of signal processing: the integration constants cannot be determined, and only part of the response can be fully
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