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焊接残余应力对铁路钢桥焊缝区域危险点列车振动动应力影响的研究

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Keywords: 焊接,残余应力,危险点动应力,列车荷载,铁路钢桥

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Abstract:

本文研究了焊接残余应力对铁路钢桥焊缝区域危险点列车振动动应力的影响。文中,以铜九线鄱阳湖铁路钢桁架桥梁为研究背景,采用符合电弧焊的双椭球热源模型,模拟出桥梁焊缝区域的焊接残余应力分布情况;同时叠加上铜九线鄱阳湖铁路钢桁架桥与焊缝节点连接的构件在列车过桥时的实测动应力,并将其施加在桥梁节点精确有限元模型上,分析得出在不同焊接残余应力作用下对鄱阳湖铁路钢桁架桥危险点的动应力响应的影响规律,得出了焊接残余应力对桥梁焊缝区域危险点列车振动动应力影响很大的结论。

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