基于崇启大桥交通流数据归一化处理的钢桥面板疲劳耐久性评估
Fatigue Durability Assessment of Orthotropic Steel Decks Based on Normalized Traffic Flow Data from the Chongqi Bridge
为了评估崇启大桥主桥钢箱梁疲劳易损部位的疲劳耐久性,本文开展了基于实际交通流的参数分析和有限元模拟。首先,采用动态称重系统对崇启大桥主桥进行为期37个月的交通流统计分析,统计各车辆的车重、轴距和轴重等特征参数,并基于以上交通流数据的归一化处理建立了适用于崇启大桥的等效疲劳车辆荷载谱;之后,选择更易受到疲劳损坏的顶板-U肋焊缝作为正交异性钢桥面板的疲劳敏感区,通过将等效疲劳车辆荷载谱加载到更为精细的钢桥面板局部模型上,计算得出了顶板-U肋焊缝处的疲劳应力幅和疲劳寿命。研究结果表明,崇启大桥顶板-U肋焊缝内外侧的等效常值应力幅超出了疲劳验算的容许应力幅,计算的相应区域疲劳寿命也表明了其存在一定的疲劳风险。以上结果为后续崇启大桥钢箱梁实桥疲劳应力监测以及各疲劳敏感区细节的具体疲劳损伤评估奠定了初步研究基础,并可为其他使用正交异性钢桥面板的桥梁的疲劳耐久性评估提供参考。
The objective of this study is to assess the fatigue durability of the fatigue-prone regions of the steel box girders of the Chongqi Bridge main bridge, and to this end, actual traffic flow parameter analysis and finite element simulation were carried out. Firstly, a 37-month traffic flow statistical analysis of the main bridge of the Chongqi Bridge was carried out by using a dynamic weighing system (WIM) to count the vehicle weight, axle distance, axle weight and other characteristic parameters of each vehicle, and the equivalent fatigue vehicle load spectrum applicable to the Chongqi Bridge was established based on the normalization of the above traffic flow data. Secondly, the top plate-U-rib weld, which is more prone to be fatigue-damaged, was chosen to be the fatigue-sensitive area of orthotropic steel decks, and the equivalent fatigue vehicle load spectrum was applied to a more detailed local model of the steel decks to calculate the fatigue stress amplitude and fatigue life of the weld. The results show that the equivalent constant stress amplitude at the inner and outer sides of the top plate-U-rib weld of the Chongqi Bridge exceeds the allowable stress amplitude for fatigue calculation, and the fatigue life of the corresponding area also indicates that there is a certain fatigue risk. The above results lay a preliminary research foundation for the subsequent fatigue stress monitoring of the real steel box girder bridge of the Chongqi Bridge as well as the specific fatigue damage assessment of each fatigue-sensitive zone detail, and can provide an empirical reference for the fatigue durability assessment of other bridges using orthotropic steel decks.
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国家自然科学基金(52278207)
国家自然科学基金(52578236)
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