B103 DEFLECTION LIMITS OF BRIDGES FOR HIGH-SPEED LINES OVER 300KM/H

抄録

Deflections of consecutive bridges excite vehicles at a constant period. The current design standard provides the deflection limit value of bridge from viewpoints of running safety and riding comfort for the speed up to 260km/h. In this study, influences of dominant parameters on dynamic responses of bridges and vehicles were examined by numerical analyses to expand the applicability of design standard in the high-speed range. In addition, dynamic responses of 17 bridges of various structure types with different span lengths were measured that consisted by vehicle running tests. The carbody accelerations of vehicles were also measured relating to bridge deflections and they were studied from viewpoints of length and rigidity of bridge. Peak-to-peak amplitudes of carbody accelerations were approximately 1.5m/s^2 or less on all bridges. A new provision for the railway design standard was proposed based on this study.