Equivalent nosing force for a steel railway bridge based on in situ measurements

L. Georgiev, Lyubomir A. Zdravkov, V. Tanev, M. Lepoev
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引用次数: 1

Abstract

The weight and design speed of the railway vehicles increases in time. As a result, the values of design loads grow up. In old Bulgarian standard [1] the equivalent nosing force is prescribed as 60kN. In the present EN1991-2 [2] this value is 100kN. Meanwhile, a significant part of the very old bridges is not designed for nosing forces. In cases of long span between cross girders of the “open type” deck and lack of nosing braces, the load bearing capacity of longitudinal girders, concerning out of plane bending moments due to nosing forces, is insufficient. To investigate the value of equivalent nosing force are provided “in situ” measurements on the longitudinal girders of “open type” deck of a steel riveted railway bridge in exploitation in the Republic of Bulgaria. The strains and horizontal linear deformations are measured in the midspan of the longitudinal beams for real trains. The equivalent nosing force is calculated using developed procedures.
基于现场测量的铁路桥等效鼻翼力
铁路车辆的重量和设计速度随时间的增加而增加。结果,设计荷载的值增大了。在旧的保加利亚标准[1]中,等效鼻翼力规定为60kN。在目前的EN1991-2[2]中,该值为100kN。与此同时,相当一部分非常古老的桥梁在设计时没有考虑到承受力。在“开放式”桥面梁间跨度大且缺少前倾支撑的情况下,纵梁在考虑前倾力引起的面外弯矩时,其承载能力不足。为研究保加利亚共和国某在建钢铆接铁路桥“开式”桥面纵梁的等效侧倾力值,对其进行了“现场”测量。测量了实际列车纵梁跨中应变和水平线性变形。用已开发的程序计算了等效鼻翼力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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