【摘要】 随着交通基础设施建设加速，曲线梁桥因其优异的空间几何适配能力被广泛应用，但半径小、跨径大的钢筋混凝土曲线梁桥在非线性弯曲与扭转耦合作用下呈现出复杂的力学响应，倾覆破坏成为其最危险的损坏模式。以青岛市某互通立交匝道曲线梁桥为例，通过曲线梁桥静力荷载试验与数值分析相结合的方法，建立并验证了有限元分析模型，研究了最不利荷载条件下曲线梁桥的倾覆破坏机理。研究表明，曲线梁桥倾覆破坏过程可分为3个关键阶段：变形体转动、刚体转动和滑动阶段。内侧支座反力从受压状态到脱空的转变是倾覆失稳的关键指标，当荷载达到1.82倍标准车辆荷载时，抗倾覆系数为2.5,符合规范限值，但结构已开始进入危险的倾覆过程。研究成果揭示了曲线梁桥倾覆破坏的演变机理，为此类桥梁的安全设计与评估提供了理论依据。更多还原

【Abstract】 With the acceleration of transportation infrastructure construction, curved girder bridges are widely used for their excellent spatial geometric adaptability. However, reinforced concrete curved girder bridges with small radius and large span exhibit complex mechanical responses under coupled nonlinear bending and torsion, making overturning failure one of their most dangerous damage modes. Taking a curved girder bridge of an interchange ramp in Qingdao as an example, this study established and validated a finite element analysis model through a combination of static load tests on the curved girder bridge and numerical analysis to investigate the overturning failure mechanisms under the most unfavorable load conditions. Results indicate that the overturning failure process of curved girder bridges can be divided into three key stages: deformable body rotation, rigid body rotation and sliding. The transition of inner support reaction force from compression to separation is a critical indicator of overturning instability. When the load reaches 1.82 times the standard vehicle load, the anti-overturning coefficient reaches 2.5, meeting the code limit, but the structure has already begun to enter a dangerous overturning process. The findings reveal the evolution mechanisms of curved girder bridge overturning failure, providing theoretical basis for safety design and assessment of such bridges.更多还原