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PSC 거더 축소모델을 통한 생애주기 긴장력 계측 센서 성능 실험
박영웅 ( Park Young Ung ),이주석 ( Lee Joo Seok ),신경준 ( Shin Kyung Joon ),이성철 ( Lee Seong Cheol ),이환우 ( Lee Hwan Woo ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
PSC girder bridges, widely applied to bridge and railroad bridge (25 ~ 50 m), are a type of bridge that introduces compressive force in advance to the part where tensile force of concrete is generated. The tension force for introducing the compressive force by inserting the tendon into the concrete is a key element of the structural performance in the PSC. At present, however, measurement and verification of this is indirectly managed through deflection and cracking. However, it has become more necessary to develop practical evaluation methods of prestress force of PSC bridges. In this experiment, a small scale PSC beam with various curvature radii was made. Tension force monitoring with FBG sensor and EM sensor was performed on test members using 3 point flexural loading test. The measured values of the FBG sensors and the EM sensors used in the experiment were analyzed and compared with the measured values of the load cell.
계측 센서를 활용한 PSC 거더 텐던의 긴장력 측정 실험
신경준,박영웅,이성철,김윤용,이환우,Shin, Kyung-Joon,Park, Young-Ung,Lee, Seong-Cheol,Kim, Yun Yong,Lee, Hwan-Woo 한국전산구조공학회 2015 한국전산구조공학회논문집 Vol.28 No.6
프리스트레스(PS) 긴장재의 긴장력 관리는 거더 성능관리에 있어 매우 중요한 항목이나 현재는 시공시 설계 긴장력의 도입 여부만을 검증한 후 공용시에는 그 관리가 이루어지지 않는 실정이다. 이에 본 연구에서는 PSC 거더의 제작단계에서부터 공용시까지 생애주기 동안의 긴장력 관리가 가능한 PSC 거더를 제안하기 위한 기초 연구로서, 현재의 기술수준으로 사용 가능한 센서들을 이용하여 PS 긴장력을 측정하는 실험 연구를 수행하였다. 소규모 거더를 제작하여 4종류의 센서를 설치하였고, 긴장력을 도입하면서 각 센서들의 적용성과 정확성을 평가하였다. 실험결과에 따르면, 중공로드셀은 편심하중이 작용하는 경우 기준값보다 하중을 높게 평가하는 경향이 있었다. EM 센서는 실용이 가능한 정확도를 보여주었으며, 콘크리트 내부의 긴장재를 따라 어느 위치에서도 설치할 수 있다. The prestressing force has not been managed after construction nevertheless it is one of the importrant factors that maintain the structural safety of PSC girder bridges. The prestressing force is just measured during construction using jacking device and after that, it can not be managed practically. For this reason, this study investigated the measurements of prestress using embedded sensors that can be available now with an ultimate goal to propose smart prestressed girders that can measure the prestress from the birth to the end of service life. 4 types of sensors were installed on the small prestressed girders, and the applicability and the accuracy of those sensors were tested while the prestress was applied to the girders. The results show that a center-hole type loadcell has a tendency to measure a prestressing force higher than a reference value, especially when it is loaded with an eccentricity. a EM sensor shows several advantages that has a good practical accuracy, that can be installed anyplace along the tendons.
이영웅,박경시,김점만 慶尙大學校 1999 論文集 Vol.38 No.-
The purpose of this fesearch is to examine the important factors of scores in Squash Game as a double match. To achieve this purpose, we can come to the following conclusion from the result of the championship contest. of Squash Game for University students in 1999. 1. The score rate of each factors are found out the following result: Drive 41.9%, Drop 16.6%, Volley drop 9.7%, Serve 8.6%, Boast 6.4%, Volley smashing 3.3%, Kill shot 2.8%, Volley 2.6%, Lop 1.4%, Boast trickle 1.3%, Boast click 1.0%, Reverse angle 0.9%, Volley boast 0.2%, Etc. (stroke)3.4% 2. Among general factors of the double match, the rate of basic shot is the highest as 81.2%, that of application shot is 15.5% and that of stroke is 3.4% 3.The skills of Basic shot encluding Drive, Drop, Serve, Boast and the skill of Application shot encluding Vol-ley drop are the most important factors for score of a double match and ten kill shot, Volley lop of Basic shot and Volley smashing of Application shot are also important. Through the above result, the skills of Drive, Drop, Serve, Boast, Volley drop etc. are main factors of score. All players have to act to the best of their ability as basic skills. Im addition, lots of studies about players are to be requested in the future.