Evolution of bridge frequencies and modes of vibration during truck passage

被引:91
作者
Cantero, Daniel [1 ]
Hester, David [2 ]
Brownjohn, James [3 ]
机构
[1] Norwegian Univ Sci & Technol NTNU, Dept Struct Engn, Trondheim, Norway
[2] Queens Univ Belfast, Sch Nat & Built Environm, Belfast, Antrim, North Ireland
[3] Univ Exeter, Vibrat Engn Sect, Kay Bldg North Pk Rd, Exeter EX4 4QF, Devon, England
关键词
Vehicle-bridge interaction; Modal analysis; Nonstationary; Wavelet; VEHICLE;
D O I
10.1016/j.engstruct.2017.09.039
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper reports an experimental campaign that aims at measuring the evolution of bridge modal properties during the passage of a vehicle. It investigates not only frequency shifts due to various vehicle positions, but also changes in the shape of the modes of vibration. Two different bridges were instrumented and loaded by traversing trucks or trucks momentarily stationed on the bridge. The measurements were analysed by means of an output-only technique and a novel use of the continuous wavelet transform, which is presented here for the first time. The analysis reveals the presence of additional frequencies, significant shifts in frequencies and changes in the modes of vibration. These phenomena are theoretically investigated with the support of a simplified numerical model. This paper offers an interpretation of vehicle-bridge interaction of two particular case studies. The results clearly show that the modal properties of the vehicle and bridge do change with varying vehicle position. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:452 / 464
页数:13
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