中文摘要：

现有曲线梁建模分析方法主要为单梁法、梁格法以及实体法三种，已有研究表明：单梁法的精确度不高，但由于其建模速度快、计算效率高而倍受设计青睐，故确定单梁法分析曲线梁桥的适用条件（即在何种条件下单梁法具有满足工程设计的足够精度）具有重要的现实意义。该文以结构应力作为主要衡量指标、圆心角作为主要判别手段开展研究。以京开路立交A匝道桥为工程原型，建立大量不同跨径厶桥面宽度B、圆心角0的梁格、单梁模型，对比单梁法与梁格法所得应力，以10％的误差率作为控制指标，反算出临界圆心角，并拟合得到单梁法的适用条件。该文研究成果对曲线梁桥的结构设计分析具有重要意义。

英文摘要：

There are three kinds of methods for modeling and analyzing the existing curved girder bridges, They are single-beam method, grillage method and entity method. According to the previous literature, the single-beam method is not so accurate, but it is generally popular because of its higher speed in analyzing and higher efficiency in calculating. So the research of the single-beam method has practical significance. Central angle is the key factor to determine whether the curved girder bridge can be analyzed with the single-beam method. According to A ramp bridge of Jingkai overpass, several models of curved girder bridges with different spans, deck widths and central angles are built and compared using the grillage method and the single-beam method in this paper. Then by taking 10% as the control index, the applicable condition of the single-beam method is obtained.