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首页> 外文期刊>Engineering Structures >Determination of impact factor for steel railway bridges considering simultaneous effects of vehicle speed and axle distance to span length ratio
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Determination of impact factor for steel railway bridges considering simultaneous effects of vehicle speed and axle distance to span length ratio

机译：同时考虑车速和轴距与跨径比的影响，确定钢质铁路桥梁的影响因子

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摘要

In common bridge analysis method, traffic load is considered as a static load increased by an impact factor. Impact factor is just a function of span length or the first vibration frequency of the bridge according to the present codes. In this paper the effects of various parameters including velocity, train axle distance, the number of axles and span lengths on dynamic responses of railway steel bridges and also impact factor values are studied.rnIn this regard dynamic responses and impact factors for four bridges with 10, 15, 20 and 25 m span lengths under trains with 100-400 km/h velocity and axle distance between 13 to 24 m have been calculated. Dynamic analysis results show that in most cases the calculated impact factor values are higher than that recommended by the relevant codes and so the offered rations for impact factor are underestimated.rnIt has also been shown that the train velocity affects the impact factor, so that the value of impact factor rises incredibly with the train velocity. Another effective element for impact factor is the ratio of train axle distance to bridge span length so that the impact factor value varies for the ratio below and above unity. The train number of axles just affects the impact factor under resonance conditions. In this paper some relations are offered for the impact factor considering parameters:velocity, train axle distance and the bridge span length.
机译：在普通的桥梁分析方法中，交通负荷被认为是增加了影响因素的静态负荷。根据当前规范，影响因子只是跨度或桥的第一振动频率的函数。本文研究了速度，火车轴距，轴数和跨距长度等各种参数对铁路钢桥动力响应以及影响因子值的影响。在这方面，四座10座桥梁的动力响应和影响因子在速度为100-400 km / h且轴距在13至24 m之间的火车下，已计算出15、20和25 m的跨度。动态分析结果表明，在大多数情况下，计算得出的影响因子值高于相关规范的建议值，因此所提供的影响因子比率被低估了。rn还表明，火车速度会影响影响因子，因此影响因子的值随列车速度的增加而急剧增加。影响影响因子的另一个有效元素是火车轴距与桥梁跨度的比率，因此影响因子值会针对小于和大于1的比率而变化。在共振条件下，轴的列车数量仅影响影响因子。本文提供了一些影响因素，考虑了以下因素：速度，列车轴距和桥梁跨度。

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