Measuring accurate dynamic deformation distribution for large-scale structures inexpensively and efficiently is a crucial challenge
of structural health monitoring. In this study, a simple technique for measuring the deflection and vibration frequency from
a captured video, based on the sampling Moiré method is developed. The striking advantage over conventional measurement
using sensors and other imaging techniques are that the developed technique allows accurate measurement of two-dimensional
deformations at multiple locations as well as the natural frequency of the target structure. Joint Photographic Experts Group
(JPEG)-formatted images encoded from the recorded video with Motion-JPEG (MJPEG) format reduced the file size significantly
without degrading the measurement accuracy and applied to deformation measurement. The effectiveness of the developed
technique was confirmed through a field experiment of an old bridge in Taiwan. The field experiment demonstrated that
both deflection and natural frequency of the bridge were successfully measured with higher 0.1 mm displacement accuracy and
0.05 Hz frequecy comparable to a conventional microwave radar displacement sensor from 20 m distance.
Sample Chapter(s)
Preface (60 KB)
Components of the Book:
- Chapter 1
Dynamic Deformation Measurement by the Sampling Moiré Method from Video Recording and its Application to Bridge Engineering
- Chapter 2
Heuristic Assessment of Bridge Scour Sensitivity Using Differential Evolution: Case Study for Linking Floodplain Encroachment and Bridge Scour
- Chapter 3
Nonlinear Dynamic Analysis of Long-Span Cable-stayed Bridges With Train–Bridge and Cable Coupling
- Chapter 4
Using Bridge Weigh-in-motion Systems to Monitor Single-span Bridge Infuence Lines
- Chapter 5
Bearing Assessment tool for longitudinal Bridge Performance
- Chapter 6
Modeling for Supervisor Synthesis – a Lock-bridge Combination Case Study
- Chapter 7
Effect of Bonding or Unbonding on Seismic Behavior of Bridge Elastomeric Bearings: Lessons Learned from Past Earthquakes in China and Japan and Inspirations for Future Design
- Chapter 8
The Specificity of Dynamic Resistance of Existing Bridge Structures in Mining Areas
- Chapter 9
Fracture Acoustic Emission Signals Identification of Stay Cables in Bridge Engineering Application Using Deep Transfer Learning and Wavelet Analysis
- Chapter 10
The Values and Significance of the Colonial Steel Railway Bridges of Pakistan
- Chapter 11
Performance of Suspension Bridge Hangers Exposed to Hazardous Material Fires Considering Wind Effects
Readership:
Students, academics, teachers and other people attending or interested in Bridge Engineering.
S. Ri
Research Institute for Measurement and Analytical Instrumentation, National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, 305-8568, Japan
Lucas J Howard
Civil and Environmental Engineering, University of Vermont, 33 Colchester Avenue, Burlington, VT, 05405, USA
Anand Patil
Engineering School of Sustainable Infrastructure and Environment, University of Florida, Gainesville, FL, 32605-0281, USA
David Garcia-Sanchez
TECNALIA, Basque Research and Technology Alliance (BRTA), Parque Científico y Tecnológico de Bizkaia Astondo Bidea Edificio 700, 48160, Derio, Spain
and more...