铁道科学与工程学报2017，Vol.14Issue(8)：1664-1673,10.
基于连续跳车激振的大跨度桥梁阻尼识别研究
Damping identification of long-span bridges from continuous vehicle bumping excitations
摘要
Abstract
In this study, a new method termed as continuous vehicle bumping excitation method that was based on resonance principle was proposed in this paper. A bridge will be set into resonance if the bridge is subjected to multiple impulses induced by a series of obstacles evenly distributed along the deck and the impulse frequency equals to the natural frequency of the attendant mode. The purpose of the excitation is to enhance the signal-to-noise ratio of measured output, and therefore improving identification accuracy of modal damping ratio. The basic theory of structural damping ratio identification by continuous vehicle bumping excitation method was presented. The validity of the proposed method was demonstrated by numerical simulation of a long-span suspension bridge with a special reference to the first anti-symmetrical vertical mode, and the effects of test vehicle on modal properties in particular on modal damping ratio of target modes were examined through complex modal analysis. It is shown that the modal damping ratio for the tested mode is unaffected if the modal frequency of the vehicle is about 5 times larger than that of the tested mode of the bridge. The modal damping can be reliably identified even the excitation and measured response are polluted with 10% noise.关键词
大跨桥梁/阻尼/车桥耦合振动/阻尼识别/连续跳车激振Key words
long-span bridges/modal damping ratio/bridge-vehicle interaction/damp identification/continuous vehicle bumping excitation分类
交通工程引用本文复制引用
华旭刚,周洋,杨坤,温青,陈政清,李瑜..基于连续跳车激振的大跨度桥梁阻尼识别研究[J].铁道科学与工程学报,2017,14(8):1664-1673,10.基金项目
国家自然科学基金资助项目(51422806,51278189) （51422806,51278189）
