铁路钢桥的动力及地震作用评估
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摘要
对处于土耳其地震多发地区的某4跨双线铁路桥梁的动力特性和地震作用进行评估。采用通用有限元软件,建立桥梁的三维计算模型。对桥梁进行现场测试,如:静、动力及材料试验,验证了有限元模型的正确性。考虑列车和地震荷载,以及结构评估结果,并利用桥梁的三维修正模型进行必要的计算。借助附加杆件,将地震荷载传递给支撑。着重研究由于卡车撞击而产生永久缺陷的第4跨,结果表明,由于承载力不足,需要更换第4跨。
In this study, dynamic and seismic assessment of a railway bridge system with four discrete spans giving service on a double track railway line and located in an earthquake-prone region in Turkey is presented. A three-dimensional computer model of the bridge was generated using a commercial general finite element analysis software. Field measurements such as static and dynamic tests as well as material tests were conducted on the bridge system. Validation of the finite element model was performed based on the results of these tests. The calibrated 3D model of the bridge structure was then used for necessary calculations regarding structural assessment and evaluation according to train loads as well as seismic loads. Additional members were proposed to transmit seismic loads to supports. The fourth span, which had a permanent imperfection due to truck collision was studied in detail. Results have shown that due to excessive amount of capacity loss, the only choice was to write off the fourth span.
In this study, dynamic and seismic assessment of a railway bridge system with four discrete spans giving service on a double track railway line and located in an earthquake-prone region in Turkey is presented. A three-dimensional computer model of the bridge was generated using a commercial general finite element analysis software. Field measurements such as static and dynamic tests as well as material tests were conducted on the bridge system. Validation of the finite element model was performed based on the results of these tests. The calibrated 3D model of the bridge structure was then used for necessary calculations regarding structural assessment and evaluation according to train loads as well as seismic loads. Additional members were proposed to transmit seismic loads to supports. The fourth span, which had a permanent imperfection due to truck collision was studied in detail. Results have shown that due to excessive amount of capacity loss, the only choice was to write off the fourth span.
引文
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