【摘要】 针对我国超重车辆荷载频发导致现行规范难以反映真实桥梁安全的问题，本文基于实测WIM数据构建了考虑冲击效应的车流荷载响应生成框架，采用复合极值理论外推随机车流响应，建立了一种考虑评估基准期影响的车辆荷载效应概率模型，提出了基于实测车流的斜拉索疲劳可靠度评估方法 .以某双向六车道高速公路WIM系统为期三个月的实测数据为基础，对工程背景斜拉桥的拉索疲劳可靠度进行了评估，结果表明：在基于实测WIM数据外推的概率模型下，斜拉桥重载侧拉索的疲劳可靠指标在3.93～6.12之间，而其承载能力极限状态抗拉强度可靠指标在7.74～11.04之间；而采用规范荷载概率模型的疲劳可靠指标在4.35～6.18之间.对比说明：疲劳可靠度远低于抗拉强度可靠度，拉索评估基准期内的安全性主要受疲劳控制；相对基于实测WIM数据外推的评估基准期荷载，采用规范荷载会较明显地高估斜拉索的疲劳可靠度.更多还原

【Abstract】 In response to the problem that the current specifications are difficult to reflect the actual bridge safety due to the frequent occurrence of overweight vehicle loads in China, this paper constructed a framework for generating traffic load response considering the impact effect based on measured data from a weight-in-motion(WIM) system. The response of random traffic flow was extrapolated using the compound extreme value theory, and a model for traffic load effect probability that considers the influence of the evaluation benchmark period was established. Moreover, a fatigue reliability assessment method for cable-stayed bridges based on measured traffic flow was proposed. Taking a cable-stayed bridge with the measured data of three mouths from a WIM system as a background, the reliability of the cables was evaluated. The results show that, in the case of using the load probability model extrapolated based on the measured WIM data, the fatigue reliability index of the cables ranges from 3.93 to 6.12, and the reliability index of the ultimate limit state strength for carrying capacity ranges from 7.74 to 11.04. The fatigue reliability index ranges from 4.35 to 6.18 when using the standard load probability model, which indicates that the fatigue reliability is significantly lower than the strength reliability, indicating that the safety of the cables in the assessment benchmark period is mainly controlled by fatigue. Compared with load benchmark periods extrapolated based on measured WIM data, the standard loads will significantly overestimate the fatigue reliability of the cables.更多还原