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이희현,박경호,전준창,이영일,경갑수 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9
In recent years, very large special bridge structures crossing rivers or seas have been popularly constructed and subsequently temporary bridge structures have been increasingly experienced in a relatively long-term service. However, very few studies have been conducted regarding the safety assessment of such structures subjected to a long-term corrosion environment. Accordingly, in the present study, the safety evaluation has been performed on the temporary bridges excursing in a long-term service and thus exposed to marine environment, such as chloride damage, For this purpose, detailed field observation has been carried out and levels of deteorioration for such bridges have been investigated in terms of numerical analysis. Consequently, behavioral characteristics of the bridges are presented.
이희현,경갑수,전준창,Lee, Hee-Hyun,Kyung, Kab-Soo,Jeon, Jun-Chang 한국강구조학회 2010 韓國鋼構造學會 論文集 Vol.22 No.3
장기간 동안 활하중의 반복재하로 인한 응력누적에 의해 발생하는 피로현상은 강교량의 내구수명을 지배하는 주요 인자중 하나이다. 본 논문은 차량 주행시 동적효과가 비교적 크게 일어나는 일반적인 중소규모의 플레이트 거더교를 대상으로 피로수명에 영향을 미치는 교통하중의 특성을 검토하였다. 검토결과, 피로수명은 시간교통량과 대형차 혼입율이 증가할수록 짧아지고, 교통하중특성의 영향을 받는다는 것을 알 수 있었다. 이러한 검토결과를 토대로 피로수명에 영향을 주는 교통하중의 특성을 대표할 수 있는 새로운 파라미터를 제시하고, 그 유용성을 확인하였다. The fatigue phenomenon, which is induced by stress accumulation due to the repeated loading of vehicles in the long term, is one of the main factors of the span of life of a steel bridge. In this paper, the effects of traffic properties on the fatigue life of ordinary short- and medium-span steel plate girder bridges that are exposed to relatively large dynamic effects are investigated. From the analysis, it was known that the fatigue life of the bridge becomes shorter with increasing traffic volume and number of large vehicles, and is affected by the weights of the vehicles. Based on the analysis results, a new parameter that can represent the traffic property that affects the fatigue life of the subject bridge is suggested, and the validity of the parameter is confirmed.
이희현(Hee Hyun Lee),김학수(Hwak Soo Kim) 한국강구조학회 1995 韓國鋼構造學會誌 Vol.7 No.1
Recently, vibrations occurring in the railway track and its neighbouring structures due to the running trains are attracting public attention as a main problem of pollution. In this study, magnitudes of vibrations generated in the infrastructure are compared by changing the material characteristics of each components of the track, and appropriate track characteristics for anti-vibration are suggested. Track and infrastructure are modelled as a multi-degree-of-freedom lumped mass system by using the effective lengths, and the unsprung mass of the wheel is assumed to contact with the rail through the Hertzian spring. Then, impact vibration response by the wheel dropping from certain height and the frequency response due to the periodic loading are obtained. From this study, it has been found that the proper way to reduce magnitude of vibration transmitted to the infrastructure is to increase masses of the track components and/or to make the fasteners and the mats more flexible. However, it seems that there should be the mechanical proof for their allowable limits considering running safety of the train.
건설안전분야 : 강 거더교의 수직보강재 응답을 이용한 주행차량의 특성 추정
이희현 ( Hee Hyun Lee ),전준창 ( Jun Chang Jeon ),정민선 ( Min Sun Jung ),경갑수 ( Kab Soo Kyung ) 한국안전학회(구-한국산업안전학회) 2012 한국안전학회지 Vol.27 No.1
The BWIM(Bridge Weigh-In-Motion) is a technology to identify vehicle properties, such as weight, speed, axle spacing and running lane, passing over a bridge by using dynamic response of bridge member. Such information will be used for assessing durability and establishing a maintenance strategy of roadway structures. In this paper, as a first step for developing BWIM system, analytical and experimental studies were conducted in order to verify whether the response of vertical stiffener in steel girder bridge can be used to identify vehicle properties running on the bridge. It was known from this study that such vehicle information could be estimated reasonably by using strain time history curve of a vertical stiffener due to running vehicles. It is because the effect of each axle-load of vehicle appears definitely in the curve. However, as the magnitude of strain of vertical stiffener is effected by running pattern of vehicles, further study is necessary to reduce error when estimating vehicle weight