Abstract

The dynamic component of bridge traffic loading is commonly taken into account with a Dynamic Amplification Factor (DAF)—the ratio between the dynamic and static load effects on a bridge. In the design codes, this factor is generally more conservative than in reality. Recently a new method of calculation of this factor had been developed. Data from 15 different bridges have been analysed since then and this paper presents the results of the analyses. The background for Bridge Weigh-in-Motion is given, and the most recent method for DAF calculation is described. The sites from which the data originated are presented, and the selection of data discussed. The results of the analyses are presented and discussed and some examples of DAF calculations are shown. Data from the considered sites have invariably demonstrated a DAF decrease with increasing axle load. This is a significant result, especially for assessment of existing structures, since it is beneficial to use measured structural parameters to optimise structural analysis.

摘要

桥梁交通荷载的动态分量通常与动态放大系数 (DAF) 一起考虑，即动态和静态荷载对桥梁的影响之间的比率。在设计规范中，这个因素通常比实际情况更保守。最近开发了一种计算该因子的新方法。从那时起，对 15 座不同桥梁的数据进行了分析，本文介绍了分析结果。给出了桥梁动态称重的背景，并描述了最新的 DAF 计算方法。提供了数据来源的站点，并讨论了数据的选择。展示和讨论了分析结果，并展示了 DAF 计算的一些示例。来自所考虑站点的数据总是表明 DAF 随着轴载的增加而降低。这是一个重要的结果，特别是对于现有结构的评估，因为使用测量的结构参数来优化结构分析是有益的。