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由于各种荷载及风、雨、雪等不利环境因素的持续作用,桥面平整度在运营期内不断降低,加剧了移动车辆对在役桥梁的冲击效应,因此有必要基于现有桥面平整度及交通量状况,提出一种能预测在役桥梁冲击系数的分析方法。本文依据国内外公认的桥面平整度指数与时间、交通量及环境等参数之间的关系,分析了20年运营期内桥面平整度系数随这些参数变化的规律,得到了相应的桥面平整度系数退化值;基于三维车桥耦合振动模型,统计分析了桥面退化模型对冲击系数的影响,并修正了现有桥规冲击系数公式,获得了在役桥梁冲击系数随时间的变化规律,为评估在役桥梁使用阶段受力性能提供理论基础。
Because of the continuous effect of various loads and unfavorable environmental factors such as wind, rain and snow, the flatness of the bridge is continuously reduced during the operation period, which aggravates the impact of moving vehicles on the existing bridges. Therefore, Degree and traffic conditions, a method of predicting the impact coefficient of in-service bridges is proposed. According to the relationship between the bridge deck roughness index and time, traffic volume and environment parameters, the paper analyzes the regularity of the bridge deck roughness coefficient changing with these parameters in the 20-year operation period and obtains the corresponding bridge deck Based on the three-dimensional vehicle-bridge coupled vibration model, the influence of deck degeneration model on the impact coefficient was statistically analyzed. The formula of the existing bridge gauge impact coefficient was amended and the variation law of the impact coefficient of the existing bridge with time was obtained , To provide a theoretical basis for evaluating the performance of the bridge in service.