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基于车辆从人行天桥下通过的三维流场网格模型,将连续钢箱梁人行天桥车致气流激励的简化算法进行了细化,使这一算法不仅以车速为参数,还考虑了不同车辆尺寸和不同桥面宽度的影响,提出了车高系数、车宽系数及桥面宽度系数,同时得出结论:不同车长时计算得到的车致气流激励对人行天桥振动的影响不大。最后对北京工业大学西门人行天桥进行了现场风压监测,将测点的监测结果与理论分析结果相对比,验证所采用的分析方法的合理性。
Based on the three-dimensional flow field grid model of vehicles passing under the pedestrian bridge, a simplified algorithm of airflow excitation for continuous steel box girder pedestrian bridge car was elaborated. This algorithm not only takes the vehicle speed as parameter, but also considers different vehicle dimensions And the effect of different deck width, the vehicle height coefficient, vehicle width coefficient and deck width coefficient are proposed. At the same time, it is concluded that the vehicle-induced airflow excitation calculated by different vehicles has little effect on the vibration of pedestrian bridge. Finally, the on-site wind pressure monitoring is carried out on the Ximen Pedestrian Bridge of Beijing University of Technology. The monitoring results of the measuring points are compared with the theoretical analysis results to verify the rationality of the analysis methods adopted.