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本文介绍了弯桥的类型及受力特点,讲述了直弯分析界限的意义,分析了目前国内外所采用的直弯分析界限,以及直弯分析界限的影响因素,重点叙述了弯桥与直桥的受力特点的界限问题,并提出将扭矩绝对值不大的弯桥简化为直桥计算的思路。采用通用有限元程序ANSYS对算例进行分析,得出结论:对于圆心角小于10°的小跨径弯桥,由于扭矩绝对值不大,做一般受弯及挠度分析时,考虑扭矩影响系数,简化为直桥分析是安全的;对于弯桥的受扭分析,由于弯扭差异较大,建议仍然采用弯桥进行分析;对于圆心角较大的弯桥,其梁单元和实体单元计算所得结果差异较大,需要采用空间实体模型分析。
This paper introduces the type and force characteristics of curved bridges, describes the significance of straight bend analysis limits, analyzes the straight bend analysis limits at home and abroad, and the influencing factors of straight bend analysis limits, The limitation of the bridge’s force characteristics and the idea that the curved bridge with small absolute value of torque is reduced to the straight bridge calculation is proposed. The finite element program ANSYS is used to analyze the example. The conclusion is as follows: For the small-span curved bridge with the central angle less than 10 °, considering the absolute value of the torque, when considering the general bending and deflection, considering the torque influence coefficient, It is safe to simplify for the straight-bridge analysis. For the torsion analysis of the curved bridge, it is suggested that the curved bridge should be used for the analysis because of the large difference between the bending and torsion. For the curved bridge with a large central angle, the calculated results of the beam and solid elements The difference is big, so we need to use the spatial entity model to analyze.