基于径向布置法的预制梁弯桥的跨径选择

Span Selection of Prefabricated Beam Curved Bridge Based on Radial Arrangement Method

摘要:

为了探讨预制梁弯桥设计时的跨径选择问题，对比分析了常用的平行布置法和径向布置法2种布梁方法之间的差异，得出了径向布置法布梁适用范围更广，更有利于工程设计及施工的结论。针对径向布置法，对布梁设计的影响因素进行总结分析后发现，桥梁平面曲线半径和允许的最大边梁悬臂调整长度值是影响预制梁弯桥跨径选择的主要因素，桥梁宽度和梁片长度是次要因素。为了便于工程应用，推导出了适用跨径范围的通用公式，并结合工程常用的预制梁跨径和结构型式，给出了便于弯桥设计的跨径选择表，为弯桥上部结构型式和跨径的适用性提供了快速判断依据，对预制梁弯桥的上部结构设计可起到借鉴作用。

Abstract:

In order to discuss the problem of span selection in the design of prefabricated curved bridge, the differences between the parallel arrangement and the radial arrangement are compared and analyzed. It is concluded that the radial arrangement method of beam layout has a wider application range and is more conducive to engineering design and construction. Aiming at the radial arrangement method, after the summary and analysis of the influencing factors on the design of beam layout, it is found that the planar curve radius of the bridge and the value of the maximum allowable cantilever adjustment length of the side beam are the main factors affecting the span selection of prefabricated beam curved bridges, and the bridge width and beam segment length are the secondary factors. In order to facilitate the engineering application, a general formula applicable for the span range is derived, and a span selection table for the design of curved bridges is given according to the spans and structure types of prefabricated beams commonly used in engineering, which provides a basis for quick judgment of the superstructure style and span applicability of curved bridge, and can be used for reference in the design of the superstructures of prefabricated curved bridge.