The paper gives the calculation formula of the steel box beam rib plate, side line length and coordinate oftransitioncurve sections combined with construction practice.
The paper discussed the main factors of influencing transitioncurve, introduced the choice and application oftransitioncurve parameter and length.
阐述了决定缓和曲线的主要因素，指出了缓和曲线（参数、长度）的选取和实际应用。
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The direct solution formula for the curvelengthof a theoretical control point on the transitioncurve is proposed, with the solution of high order equation being avoided.