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장승엽(Seung Yup Jang),조호현(Ho-Hyun Cho),양신추(Sin Chu Yang) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
In the areas susceptible to vibration and noise induced by railway traffic such as downtown area and stations under railway lines, the vibration and the structure-borne noise can be solved by floating slab track system separating the entire track structure from its sub-structure using anti-vibration mat or springs. In other countries, the core technologies for vibration-proof design and vibration isolator - one of key components - have been developed and many installation experiences have been accumulated. However, in Korea, since the design technology of system and components are not yet developed, the foreign systems are being introduced without any adjustment. Thus, in this study, the vibration isolator has been developed and its performance are investigated by the dynamic analysis of a station structure under railways lines and the floating slab track system. For this purpose, the loads transferred from the vibration isolator of the floating slab track were evaluated by train running simulation considering vehicle-track interaction, and then the dynamic analysis of station structure subjected to these loads was performed. The dynamic analysis results show that the proposed floating slab track can reduce the vibration of structure by about 25dB compared with that in conventional ballast track without floating system.
등가 전단 스프링 모델을 이용한 플로팅 슬래브궤도 연결부에서의 하중전달 특성 분석
장승엽(Seung Yup Jang),안미경(Mi Kyoung Ahn),최원일(Won Il Choi ),박만호(Man Ho Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Recently the floating slab track that can effectively mitigate the vibration and structure-borne noise is being discussed to be adopted. The floating slab track which is a track system isolated from the sub-structure by vibration isolators. Unsimilarly to conventional track and the slab deflection is large. Therefore the running safety and ride comfort should be investigated. Especially at slab joint since the load cannot be transferred the possibility that the dynamic behavior of track and train became unstable is high. Thus in general dowel bar are often installed at slab joints. To determine the appropriate dowel ratio the load transfer characteristics should be investigated. In this study dowel bar joint is modeled by equivalent shear spring and this model is verified by comparison with experimental results. Using the proven model the load transfer efficiency and deflection at slab joint according to dowel ratio and stiffness and spacing of vibration isolator were examined.