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이병구 ( Lee Byoung Koo ),최규문 ( Choi Kou Moon ),이태은 ( Lee Tae Eun ),김무영 ( Kim Mu Young ) 한국농공학회 2001 韓國農工學會誌 : 전원과 자원 Vol.43 No.5
This paper deals with the free vibrations of horizontally curved beams partially supported on elastic foundations. Taking account of the effects of rotatory inertia and shear deformation, differential equations governing the free vibrations of such beams are derived, in which the Pasternak foundation model is considered as the elastic foundation. Differential equations are numerically solved to calculate natural frequencies and mode shapes. The experiments were performed in which the free vibration frequencies of such curved beams in laboratorial scale were measured and these results agreed quite well with the present studies. In numerical examples, the circular, parabolic, sinusoidal and elliptic curved members are considered. The parametric studies are performed and the lowest four frequency parameters are reported in tables and figures as the non-dimensional forms. Also the typical mode shapes are presented.
P-FIT 궤도의 탄성고무받침 시공오차에 따른 구조 안전성 검토 연구
이창호(Lee. Changho),정혁상(Jung. Hyuksang),최규문(Choi. Goumoon),김재왕(Kim. Jaewang),권세곤(Kwon. Segon) 한국도시철도학회 2021 한국도시철도학회논문집 Vol.9 No.3
본 연구에서는 기존선 도시철도 구간에서 노후 자갈궤도를 콘크리트궤도로 급속개량을 위해 개발된 사전제작형 급속개량 궤도(P-FIT)의 운행선 급속 시공 시, 사전제작형 콘크리트패널 하부에 이산지지 되는 탄성고무받침의 시공오차에 따른 구조 안전성 검토를 수행하였다. 사전제작형 콘크리트패널에 열차하중 재하시 탄성고무받침 종방향 및 횡방향 최대 시공오차를 고려하여 검토한 결과, 패널에 발생하는 응력은 탄성고무받침의 종방향, 횡방향, 종·횡방향 동시 시공오차 발생 순으로 증가하였으나 허용응력 이내인 것으로 나타나 구조적 안전성을 확보하는 것으로 나타났다. In this study, in the case of rapid construction of Precast Fast Improvement slab Track(P-FIT) developed for quick improvement of the old ballast track into concrete tracks in the urban railway section of the existing line, structural safety evaluation was conducted according to the construction error of the elastic rubber support discretely supported under the precast concrete panel. As a result of examining the maximum construction error in the longitudinal and lateral directions of the elastic rubber bearing under the train load on the precast concrete panel, the stress acting on the panel increased in the order of construction errors occurrence in the longitudinal, lateral, and longitudinal and lateral directions of the elastic rubber bearing. But it has been shown to secure structural safety since the generated stress was found to be within the allowable stress.