独柱墩桥梁加固拉索参数化分析及优化

Parametric Analysis and Optimization of Reinforcement Cables for Single-column Pier Bridges

摘要:

独柱墩桥梁因结构简洁、景观协调等特点被广泛应用，但在偏载作用下的抗倾覆稳定性不足问题日益凸显。针对某高速公路独柱墩曲线桥的倾覆隐患，提出增设拉索加固的设计方案，并通过有限元模型的参数化分析方法研究拉索角度、预紧力等参数对桥梁抗倾覆稳定性的影响规律。结果表明，拉索索力增加可显著提升抗倾覆系数（30 t至100 t时系数提升28.6%），而墩高变化（3.5 m至20 m）对抗倾覆稳定性影响较小，但需大幅增加拉索尺寸以保持刚度。优化建议提出优先提升索力、控制墩高范围及结合弯桥特性调整加固策略。

Abstract:

Single-column pier bridges are widely used due to their simple structure and coordinated landscape, but the problem of insufficient anti-overturning stability under unbalanced loads is becoming increasingly prominent. A design scheme to add cable reinforcement is proposed for the overturning hazard of a single-column pier curved bridge on an expressway, and the influence of cable angle, pre-tension force and other parameters on the anti-overturning stability of the bridge is studied through the parametric analysis method of finite element model. The results show that increasing the tension of the cable can significantly improve the anti-overturning coefficient (28.6% increase at 30 t to 100 t), while the change in pier height (3.5 m to 20 m) has a small impact on stability, but a significant increase is required in cable size to maintain stiffness. The optimization suggestions are put forward for giving priority to enhancing the cable force, controlling the range of pier height, and adjusting the reinforcement strategy in combination with the characteristics of the curved bridge.