吊床版歩道橋の経年に伴う形状・静特性・振動特性について(都市基盤デザイン工学科)

Abstract

Japanese stress ribbon bridges were constructed a lot in 1990's, but the authors do not yet hear about their inconvenience. We carried out regularly a static experiment and dynamic experiment of JINYANOMORI stress ribbon pedestrian bridge to have been constructed in 1993 and were able to accumulate many data. In this paper, we examined about characteristics on JINYANOMORI stress ribbon pedestrian bridge. These are shape of a bridge, the situation of bridge, influence line of deflection, natural frequencies, natural modes and damping constants. And we examined a variation of measurement values to know how a shape of bridge, a static characteristic and a vibration characteristic changed with aging more than 10 years. In numerical calculation, we executed the solid analysis using the beam element. By decreasing tensions we obtained the bridge shape, influence line of deflection, the variation of natural frequencies and the variation of natural modes.