Dynamic behaviour of twin single-span ballasted railway viaducts - Field measurements and modal identification

被引：79

作者：

Rebelo, C. ^{[1
]}

da Silva, L. Simoes ^{[1
]}

Rigueiro, C. ^{[2
]}

Pircher, M. ^{[1
]}

机构：

[1] Univ Coimbra, Dept Civil Engn, ISISE, P-3000 Coimbra, Portugal

[2] Polytech Inst Castelo Branco, Dept Civil Engn, ISISE, Castelo Branco, Portugal

来源：

ENGINEERING STRUCTURES | 2008年 / 30卷 / 09期

关键词：

railway viaducts; vibration; ballast; measurements;

D O I：

10.1016/j.engstruct.2008.01.023

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper presents the results of experimental measurements on a number of existing small to medium single span ballasted railway bridges in Austria. These bridges were selected for dynamic field measurements following a preliminary numerical evaluation that identified very high vertical accelerations. From the dynamic measurements it was possible to conclude that: (i) the damping due to friction between ballast particles and the friction in the supports plays an important role in the evaluation of maximum accelerations and (ii) the first natural frequencies of the bridges vary according to the amplitude of vibration, that is, increasing vibration amplitudes correspond to a decrease of the first natural frequency in a consistent way for all investigated bridges. Calibrated FE models for these bridges confirmed the experimental conclusions. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2460 / 2469

页数：10

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