標題: A bundled time domain reflectometry-based sensing cable for monitoring of bridge scour
作者: Wang, Kai
Lin, Chih-Ping
Chung, Chih-Chung
土木工程學系
Department of Civil Engineering
關鍵字: bridge scour monitoring;time domain reflectometry (TDR);waveguide design
公開日期: 1-五月-2019
摘要: Scour monitoring is crucial for providing early warning of bridge safety and extending the knowledge of scour process. Traditional methods that rely on underwater instruments encounter difficulties in installation and operation in harsh fluvial environment. Time domain reflectometry (TDR)-based scour sensing wire was recently introduced as a promising technique to improve field deployment and durability. This study focused on further improving the concept of TDR sensing wire for better sensor package and performance. An innovative bundled bottom-up sensing cable was proposed to improve sensor durability and avoid the adverse effect of sensor fouling. The sensor durability is enhanced by twisting two sets of steel strands (as two opposing electrodes for the waveguide) around a coaxial cable into a composite sensing cable. The inner coaxial cable is introduced and armored by the sensing steel strands to direct TDR pulse to the bottom end before connecting to the sensing waveguide formed by steel strands for bottom-up sensing. Furthermore, taking advantage of a new data reduction method by using time-lapse differential waveform, robustness of system calibration and scour estimation is further enhanced. Experimental results revealed the optimal design of bundled TDR sensing cable, effectiveness of the bottom-up sensing approach, and better performance of the differential waveform method.
URI: http://dx.doi.org/10.1002/stc.2345
http://hdl.handle.net/11536/151665
ISSN: 1545-2255
DOI: 10.1002/stc.2345
期刊: STRUCTURAL CONTROL & HEALTH MONITORING
Volume: 26
Issue: 5
起始頁: 0
結束頁: 0
顯示於類別:期刊論文