基于桥面状况退化的车桥耦合振动分析

Analysis on Coupled Vibration of Vehicle Bridge Based on Bridge Deck Status Degeneration

针对常见跨径的公路简支梁桥,对其进行车辆桥梁耦合振动分析,研究了不同跨径、不同行驶速度下桥面状况退化对桥梁冲击系数的影响规律。结果表明,桥面不平整度对桥梁冲击系数的影响几乎呈线性变化,且桥面状况越差桥梁冲击系数越大,当不平整度最大值大于2cm后,桥梁冲击系数基本上均大于设计值。因此,在以后的桥梁养护工作中,应尤其注意桥面的维护。

Abstract Aiming at the simply supported girder bridge of highway with common span length, the analysis on coupled vibration of vehicle bridge is made, and the research on influence rule of bridge deck status degeneration under different span lengths and travel speed on bridge impact coefficient is made. The results show that the influence of bridge deck roughness on bridge impact coefficient nearly has linear variation, the poorer the bridge deck status is, the larger the bridge impact coefficient is, when the maximum value of roughness is more than 2cm, the bridge impact coefficient is basically larger than design value. Therefore, it is necessary to pay attention to the maintenance of bridge deck in future bridge maintenance work in particular.