曲线桥梁车桥耦合振动数值分析方法

Numerical analysis method of vehicle-bridge coupling vibration of curved bridge

为研究曲线桥梁车桥耦合振动响应规律,基于模态综合法原理,建立15自由度五轴重卡车型,以50+100+50 m三跨曲线连续梁桥(R=600 m)为计算示例,建立仿真模型,获取桥梁模态信息,基于轮-桥位移几何和力学耦联关系,提出曲线桥梁车桥耦合数值分析方法,探讨了车速、路面不平度、曲率半径和车辆载重等因素对曲线桥梁动力响应的影响。结果表明:路面不平度和车辆载重是影响曲线桥梁动力响应的主要敏感因素;车速对于曲线桥梁的影响较为复杂,难以发现其规律性;曲率半径变化对桥梁扭转角的影响较大,对桥梁竖向位移影响相对较小,相关研究成果可为此类桥梁的动力安全评估提供理论参考。

In order to study the variation of vehicle-bridge coupling vibration response of curved bridge, based on the principles of modal synthesis, a 15-degree-of-freedom five-axis trailer space model was established. Taking a 50+100+50 m three-span curved continuous beam bridge(R=600 m) as a calculation example to obtain bridge modal information. Based on the wheel-bridge displacement relationship, a vehicle-bridge coupling numerical analysis method for curved Bridges is proposed, and the influence of vehicle speed, road unevenness, radius of curvature and vehicle load on the dynamic response of curved bridges was discussed. The results show that road roughness and vehicle load are the main sensitive parameters that affect the dynamic response of the bridge. The impact of vehicle speed on curved bridges is complex, and it is difficult to find its regularity. The change in the radius of curvature has a greater impact on the torsion angle of the birdge. The influence of the vertical displacement of the main girder is relatively small. The relevant research results can provide theoretical guidance for dynamic safety assessment of such bridges.