The effects of hammer operator in manually operated impact hammer testing of lightweight structures
Manually operated impact hammer testing is widely utilised in the modal analysis of small to medium sized civil engineering structures because of its convenience,efficiency and economy.In such testing,an operator is present on the structure during the data collection.Consequently,the identified modal parameters are essentially those of the hammer operatorstructure system rather than those of the required empty structure.The effects might be significant for ultra-lightweight fiber reinforced polymer(FRP)composite structures.If there is strong hammer operator-structure interaction,the existing system identification methods,which routinely neglect the presence of the operator,could lead to erroneous results of modal analysis.In this paper,the authors discuss the effects of having two different hammer operators on identifying modal parameters of an all-FRP bridge.It is shown that the interaction effects do occur and they can interfere with reliable modal parameter identification by shifting natural frequency and damping ratio.In addition,by combining the data obtained by different hammer operators,conducting the same testing on the same structure,can lead to misleading modal analysis results.
Human-structure interaction impact hammer testing hammer operator system identification lightweight FRP structure
Xiaojun Wei Justin Russell Stana (Z)ivanovi(c) J.Toby Mottram
School of Engineering,University of Warwick,Coventry,CV4 7AL UK
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
2489-2495
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）