近年，日本は大規模な地震に見舞われ，阪神大震災rnでは多数の鉄道車両が脱線し，新潟県中越地震では高rn速走行中の新幹線の脱線が生じた．高速走行車両が地rn震時に脱線，転覆した場合，多数の死傷者がでる危険rn性があるため，高速走行車両の地震時の振動挙動を検rn討することは非常に重要である．国枝らは，構造物rnの耐震設計法に広く使われているモード解析法によrnり，転覆する危険性について検討している．官本らrnは，58自由度系の複雑な車両モデルで正弦波加振時のrn車両の振動挙動について検討している．また，松本らrnは，地震時における構造物上での走行車両の振動挙rn動について検討している．%The overturning possibility for the vehicle running at very high speed subjected to the base excitation is investigated. One-half of the whole vehicle is analytically modeled. The vehicle consists of the body and the truck. The body and the truck have 3 degrees of freedom (horizontal, vertical and rolling direction) respectively, and the wheel has 1 degree of freedom (horizontal direction). Considering the stoppers, the springs between the body and the truck, and that between the truck and the wheel are treated by the nonlinear springs. The creep force and the contact between the flange of the wheel and the rail are considered. The vibrational behavior of the vehicle is calculated when the vehicle is subjected to the actual seismic input in horizontal and vertical directions simultaneously. The possibility of rollover of the vehicle is evaluated by "risk rate of rollover". The risk rate of rollover of the running vehicle is investigated both in a straight track and a curve track.
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