The channel-box hybrid continuous girder,a novel structure formed by integrating channel-girders and box girders,is applicable for railway bridge with small curve.However,the larger curvature induces significant bending-torsion coupling of curved girders,potentially leading to girder cracking or bearing damage.To study the influence of curve radius on the spatial mechanical behavior of railway curved channel-box hybrid continuous girders,a finite element model of spatial girder elements was established based on the two equal span channel-box hybrid continuous girders of the Jieyang-Huilai single track railway crossing the Meizhou-Shantou high speed railway under construction.The displacement,stress,and natural vibration characteristics of the bridge during the cantilever rotation construction and bridge operation stages were analyzed,and the influence of different curve radii on the structural stress characteristics such as deformation,stress,and natural vibration characteristics of the main girder during the rotation construction and operation stages was calculated.The results indicate that during both rotation(cantilever)construction and operation(continuous girder)stages,the vertical displacement difference inside and outside curves the girder is mainly caused by the dead load,and the influence of other loads is relatively small.For a two equal span single-track railway channel-box hybrid continuous girder bridge,when the span is large and the ratio of the main girder width to the curve radius is small,the curve radius is not a sensitive parameter that affects the normal stress and natural frequency of the main girder along the bridge direction.However,the curve radius has a significant impact on the vertical displacement difference inside and outside curves of the channel-box hybrid continuous girder bridge.Under the most unfavorable working conditions,the key static and dynamic performance indicators such as deformation,stress,and natural vibration characteristics of the two equal span railway curved channel-box hybrid continuous girder bridge during the rotation construction and operation stages meet the requirements of the specifications.This new structure is suitable for bridges with a curve radius exceeding 300 m and limited building height.
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