The steel railway bridge at Vise (Belgium) is used mainly for heavy axle load freight trains. Trains were passing at a maximum speed of 20 km/h (1991). This paper reports on the dynamic analysis of the existing bridge, aiming at improving the structure such that the maximum train speed would be increased to 60 km/h. A finite element model of the bridge was set up. A dynamic analysis yielded modal parameters and computed stress levels. Accelerations and stress levels were measured on the bridge during passage of heavy freight trains. By linking analysis and test results, the dynamic bridge model was updated and dynamic forces for train passages were obtained. The dynamic forces were extrapolated for higher train speeds and new stress levels in the bridge were obtained. This resulted in the design of a load repartitioning structure between the track and the bridge structure, in order to reduce the stresses to acceptable levels. This design, based upon a procedure which links analysis and test, resulted in an expected increase of the bridge life time with some 30 years. Trains are now passing at 80 km/h.
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机译：VISE（比利时）的钢铁铁路桥主要用于重型轴载荷货火车。火车以20公里/小时（1991）的最大速度传递。本文报告了现有桥梁的动态分析，旨在改善结构，使得最大列车速度将增加到60 km / h。建立了桥的有限元模型。动态分析产生了模态参数和计算的应力水平。在重型货车通过过程中，在桥梁上测量加速度和应力水平。通过连接分析和测试结果，可以更新动态桥梁模型，并获得火车段的动态力量。动态力被推断出用于更高的列车速度，并且获得了桥中的新应力水平。这导致在轨道和桥接结构之间的负载折销结构的设计，以将应力降低到可接受的水平。这种设计基于链接分析和测试的程序，导致30年来预期的桥梁寿命时间。火车现在经过80公里/小时。
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