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杨浦大桥钢箱梁疲劳应力监测及寿命分析

, PP. 105-109

Keywords: 桥梁工程,疲劳应力,疲劳寿命,钢箱梁,应变时程数据,日应力谱

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Abstract:

针对杨浦大桥钢箱梁,进行了疲劳应力的监测分析和疲劳寿命的预测研究。利用实桥布设的应变传感器获取应变时程数据,处理成应力时程数据后,结合雨流计数法技术,得到日应力谱,并通过相关统计分析得到了标准日应力谱。利用标准日应力谱数据和相关疲劳规范,研究了杨浦大桥钢箱梁的疲劳寿命等问题。研究结果表明,由于车辆荷载谱或有限元模型均存在大量的假定简化,利用记录的应变(应力)时程数据进行疲劳寿命评估,为准确可靠的研究方法;主梁最容易发生疲劳破坏的部位是各个构造细部,因为在构造细部处往往会产生应力集中,使该处应力远高于构件其他部位;根据相关疲劳规范,杨浦大桥钢箱梁角焊缝具有良好的抗疲劳性能,不会由于疲劳受力而破坏。

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