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为研究构造参数对钢桥面疲劳应力特征的影响规律,基于润扬长江大桥斜拉桥设计参数,建立钢箱梁多尺度疲劳分析模型。分析顶板和纵肋在3类典型轮载作用下的疲劳应力分布特征,详细考察顶板-纵肋和纵肋对接2类细节的疲劳应力代表值对构造参数的敏感性。结果表明,顶板和纵肋疲劳应力的横桥向分布长度为轮载边缘以外1倍和2倍纵肋间距,顺桥向分布长度与横隔板间距相当。纵肋厚度差异是造成2座桥梁纵肋对接细节疲劳监测结果差异的重要原因。顶板-纵肋和纵肋对接细节的疲劳应力分别对顶板和纵肋厚度最为敏感,同时前者疲劳应力随横隔板间距减小而下降,而后者则有可能增大,而2类细节均对横隔板厚度变化不敏感。
In order to study the influence of structure parameters on the fatigue stress characteristics of steel bridge deck, a multi-scale fatigue analysis model of steel box girder is established based on the design parameters of the cable-stayed bridge of Runyang Yangtze River Bridge. The fatigue stress distribution characteristics of roof and longitudinal rib under three kinds of typical wheel loads are analyzed. The sensitivity of the representative values of fatigue stress to the structural parameters of roof-longitudinal rib and longitudinal rib butt joint are investigated in detail. The results show that the transverse distribution of fatigue stress of roof and longitudinal ribs is 1 times and 2 times of longitudinal rib spacing outside the edge of the wheel. The distribution length along the bridge is equivalent to the distance between horizontal partitions. The difference of longitudinal rib thickness is the important reason for the difference of the fatigue monitoring results of the two longitudinal bridges. The fatigue stresses of the roof-longitudinal rib and longitudinal rib butt-joint details are respectively most sensitive to the thickness of roof and longitudinal rib, while the fatigue stress of the former decreases with the decrease of the spacing of transverse diaphragm, while the latter may increase, while the two kinds of details are correct Diaphragm thickness change is not sensitive.