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Design criteria for impact factors based on dynamic on-site data in railway bridges

机译:基于动态现场数据在铁路桥梁的影响因素设计标准

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摘要

To evaluate the dynamic behaviours of bridges, many researchers have analysed interactions between vehicles and bridges with numerical methods instead of field loading tests. However, conventional numerical methods take too much time and cost to evaluate the impact factor of bridges in design and maintenance practice. The objective of this study was to propose improved design criteria by using impact factors based on natural frequency rather than span length of railway bridges using dynamic field load-carrying capacity test database. The improved design criteria use a different methodology than that outlined in the International Union of Railway specifications Code. Statistical regressions are applied to more easily estimate the natural frequency of a bridge with a span length of 20 m or longer with steel plate girder or truss superstructures. Calculated impact factors were compared to impact factors obtained from field measurements. Results indicated that the improved method could provide a very reliable estimation for actual impact factors. Since the suggested impact factor criteria are conservative, the proposed method can be used in design and management stages to consider dynamic effects of railway bridges in a more intuitive manner.
机译:为了评估桥梁的动态行为,许多研究人员分析了车辆与桥梁之间的相互作用,具有数值方法而不是现场加载测试。然而,常规数值方法花费过多的时间和成本来评估设计和维护实践中的桥梁的影响因子。本研究的目的是通过使用基于固有频率而不是使用动态现场负载携带容量测试数据库使用基于固有频率而不是铁路桥的跨度长度来提出改进的设计标准。改进的设计标准使用不同的方法,而不是国际铁路规范守则中概述的方法。统计回归应用于更容易估计桥梁长度为20米或更长的桥梁的固有频率,或者用钢板梁或桁架上部结构。将计算的冲击因子与从现场测量获得的影响因子进行比较。结果表明,改进的方法可以为实际影响因素提供非常可靠的估计。由于建议的影响因子标准是保守的,所提出的方法可用于设计和管理阶段,以考虑以更直观的方式考虑铁路桥的动态效果。

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