为研究公路桥梁在各种复杂车辆行驶工况下的车桥耦合振动响应，提出基于ANSYS单一环境下的数值分析方法，通过APDL编程语言实现ANSYS环境下桥梁与车辆独立模型间的耦合关系并得到振动时程响应曲线。通过与相关参考文献对比验证该方法的正确性，并研究了一座大跨径连续梁桥在车辆同向行驶、反向行驶两种常见工况下全桥所有截面的车桥耦合的振动响应，总结挠度、弯矩冲击系数沿桥梁纵向的变化规律。结果表明，挠度（弯矩）冲击系数沿全桥各截面变化规律复杂，其数值与车速和对应截面均有密切关联，桥梁支点处易产生突变，跨内变化较光滑，中跨跨中附近出现拐点，挠度（弯矩）效应大小与冲击系数呈反比趋势，不能采用简单函数进行回归拟合。
Abstract
In order to discuss the respond of coupled vibration of vehiclebridge in complex vehicle driving conditions, this paper present a vehiclebridge coupled vibration numerical analysis method based on ANSYS. The relationship between bridge and vehicle is satisfied by APDL language for their separate models in ANSYS environment and can get its vibration schedule response, which verified by contrast to classic references. The paper analyze the respond of vehiclebridge coupled vibration of a bigspan continuous beam with whole sections in two usual conditions which are the vehicles driving condition and the reverse driving condition and sum up the laws about the deflection and bending moment impact factors’ changing in the vertical extension of the bridge. The results shows that the changing regularity of deflection and bending moment impact is complex in the whole sections, whose value has a strong relationship with driving speed and corresponding section. The impact factors easy to produce mutations in the bridge protection, it changes smooth in the span but appears a tipping point near the middle of midspan. The deflection or bending moment impact factors shows a inversely proportional tendency, which can’t use simple function for regression.
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