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通过把车辆和桥梁看作一个耦合系统来建立模型去求解桥梁的车致动力反应。文中研究了由AASHTO HS20卡车引起的不同跨径的短板桥的动力反应。利用参数分析来研究不同车速及不同路面状况所产生的效应。研究发现,引起桥梁动力反应峰值的临界车速遵循描述列车致桥梁共振的规则。分析中考虑了引桥状态的影响包括引桥桥头断层及引桥板形变。虽然引桥变形对桥梁的动力反应影响微小,但是在研究中却发现引桥桥头断层能在短跨板桥中引起显著的动力反应。该文对评价既有短跨径桥梁的动力性能有很大的意义,因此值得中国从业者借鉴。
The vehicle and bridge are considered as a coupling system to build the model to solve the vehicle’s car-induced response. In this paper, the dynamic responses of short span bridges with different span diameters caused by AASHTO HS20 truck are studied. Parametric analysis is used to study the effects of different vehicle speeds and different road conditions. The study found that the critical speed that caused the bridge dynamic response peak follows the rules that describe the bridge-induced resonance of the train. The analysis considers the influence of the approach bridge including the fault of the approach bridge and the deformation of the approach bridge. Although the deformation of the approach bridge has little effect on the dynamic response of the bridge, it is found in the study that the approach bridge fault can cause a significant dynamic response in the short span bridge. This article is of great significance to evaluate the dynamic performance of the existing short-span bridges, so it is worth learning from Chinese practitioners.