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사장교 케이블 정착구 손상사례 및 장력계측을 이용한 손상감지에 대한 고찰
양기재 ( Yang Ki-jae ),정지숙 ( Jung Ji-sook ),박원주 ( Park Won-joo ),박시현 ( Park Si-hyun ),유동우 ( You Dong-woo ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
A damage case of parallel strand cable anchorage was introduced, in which 7 strands were slipped from each wedge at the anchorage of the cable stayed bridge in service. Also, a cable damage detection scheme was proposed on the basis of tension force measurement and model updating method by least square estimation to minimize tension variation. The proposed scheme has been verified from analytical simulations and the actual damage case. The damaged cable leading to tension variation more than noise level of cable force measurement was successfully detected with 7~8 strands damage indication of 2% error in the actual strand slippage case.
LoRa LPWAN을 적용한 무선 케이블 장력 센서의 현장 적용성 연구
박원주 ( Park Won-joo ),하동수 ( Ha Dong-soo ),양기재 ( Yang Ki-jae ),박시현 ( Park Si-hyun ),장범수 ( Chang Buhm-soo ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
The wireless sensor prototype was developed and the field test result, natural frequencies of each mode in stay-cable, showed 0.5% difference compared to the wired sensor. Also, the cable tension derived by the vibration method was 1.177% difference. As a sensor for managing cable tension, the applicability to bridges was confirmed. In the next study, LoRa LPWAN technology will be applied to various sensors used in structures.