Ojha Shubhi, Pal Priyaranjan, Mehta P K
Department of Civil Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, Uttar Pradesh, 211004, India.
Sci Rep. 2025 Feb 27;15(1):7050. doi: 10.1038/s41598-025-91172-z.
The study employs finite element method to examine the effects of curve angle variations on the behavior of single and double-cell prestressed concrete box-girder bridges. A total of eighty bridge models were examined, featuring a range of curve angles from 0 to 60°, with increments of 12° between each model (0°, 12°, 24°, 36°, 48°, and 60°). The study revealed that bridges with curve angles of 24° or less exhibit minimal impact on forces, suggesting that they can be effectively treated as straight bridges for analytical purposes. The study revealed a marked change in structural response for bridges with curve angles greater than 24°, highlighting the influence of increased curvature on bridge behavior. A comprehensive evaluation was conducted to investigate the influence of changes in curve angles, span lengths, cell numbers, and span-depth ratios on structural forces and deflections under various load types, including dead, live, and prestressed loads. As the curve angle increases, a corresponding decrease in the flexural moment and vertical deflection is observed under prestressed loading conditions. Based on the analysis, it is reasonable to conclude that prestressed concrete box-girder bridges are best suited for applications involving higher curve angles.
该研究采用有限元方法来考察曲线角度变化对单箱和双箱预应力混凝土箱梁桥性能的影响。总共研究了80座桥梁模型，其曲线角度范围为0至60°，每个模型之间的增量为12°（0°、12°、24°、36°、48°和60°）。研究表明，曲线角度为24°或更小的桥梁对受力的影响极小，这表明出于分析目的，它们可有效地视为直桥。研究还表明，曲线角度大于24°的桥梁的结构响应有显著变化，突出了曲率增加对桥梁性能的影响。进行了全面评估，以研究曲线角度、跨度长度、箱室数量和跨深比的变化对包括恒载、活载和预应力荷载在内的各种荷载类型作用下的结构受力和挠度的影响。在预应力荷载作用下，随着曲线角度的增加，观察到弯曲力矩和竖向挠度相应减小。基于该分析，合理的结论是预应力混凝土箱梁桥最适合用于曲线角度较大的应用场景。
