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VolF 15
”NF 1998
•ÅF 443-448
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ŒfÚŽGŽi‰pjF NATIONAL SYMPOSIUM ON WIND ENGINEERING
’˜ŽÒi‰pjF Satoru SAKUMA,Toshiaki MAEDA,Toshio UEDA,Yoshikazu KOBAYASHI
ƒ^ƒCƒgƒ‹i‰pjF FIELD OBSERVATION OF AERODYNAMIC RESPONSE ON MEIKO WEST BRIDGE IN TANDEM ARRANGEMENT
´˜^i‰pjFMeiko West Bridge is composed of 2 cable-stayed bridges with flat box girders whose interval 50m. Aerodynamic stability of those bridges in tandem arrangement wasinvestigated by wind tunnel tests. According to the results, vortex-induced vibration may occur in a smooth flow, but it will disapper in a turbulent flow. In order to certify those phenomena, the fieid observation was carried out. The data is similar to the one derived from the wind tunnel tests in a boundary layer turbulent flow, so the aerodynamic safety of this bridge is enough. It is well known that the rain-wind induced vibration was discovered on the phaseI line bridge in Japan. Therefore, all cables have been connected muntuallyby wrie ropes.It will be necessary for nay vibration control device to be installed as the same phenomenon would occur on the phase II line bridge. To obtain the materials for design judgement, the field observtion of cable' s motion was carried out simultaneously. The obtained results show that there is no problem in the fatigue strength. But from the view point of the aesthetic design, the controling devices with high viscous damping rubbers were installed on both bridges.
ƒL[ƒ[ƒhi‰pjF field observation, vortex-induced vibration, rain-wind induced vibretion
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