Experimental study of structural damage identification based on modal parameters and decay ratio of acceleration signals  

作　　者：Zhigen WU Guohua LIU Zihua ZHANG 

机构地区：[1]College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310027,China

出　　处：《Frontiers of Structural and Civil Engineering》2011年第1期112-120,共9页结构与土木工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.50579081);the Graduate Innovation Fund of Zhejiang(No.YK2008025).

摘　　要：A novel damage assessment method based on the decay ratio of acceleration signals(DRAS)was proposed.Two experimental tests were used to show the efficiency.Three beams were gradually damaged,and then the changes of dynamic parameters were monitored from initial to failure state.In addition,a new method was compared with the linear modal-based damage assessment using wavelet transform(WT).The results clearly show that DRAS increases in linear elasticity state and microcrack propagation state,while DRAS decreases in macrocrack propagation state.Preliminary analysis was developed considering the beat phenomenon in the nonlinear state to explain the turn point of DRAS.With better sensibility of damage than modal parameters,probably DRAS is a promising damage indicator in damage assessment.

关 键 词：damage assessment decay ratio of acceleration signals(DRAS) wavelet transform(WT) modal analysis reinforced concrete beam beat phenomenon 

分 类 号：TS1[轻工技术与工程—纺织科学与工程]