%0 Journal Article
%T Structural Pounding Detection by Using Wavelet Scalogram
%A Shutao Xing
%A Marvin W. Halling
%A Qingli Meng
%J Advances in Acoustics and Vibration
%D 2012
%I Hindawi Publishing Corporation
%R 10.1155/2012/805141
%X Structural pounding can cause considerable damage and even lead to collapse of structures. Most research focuses on modeling, parameter investigation, and mitigation approaches. With the development of structural health monitoring, the on-line detection of pounding becomes possible. The detection of pounding can provide useful information of potential damage of structures. This paper proposed using wavelet scalograms of dynamic response to detect pounding and examined the feasibility of this method. Numerical investigations were performed on a pounding system that consisted of a damped single-degree-of-freedom (SDOF) structure and a rigid barrier. Hertz contact model was used to simulate pounding behavior. The responses and pounding forces of the system under harmonic and earthquake excitations were numerically solved. The wavelet scalograms of acceleration responses were used to identify poundings. It was found that the scalograms can indicate the occurrence of pounding and occurrence time very well. The severity of the poundings was also approximately estimated. Experimental studies were carried out, in which shake table tests were conducted on a bridge model that underwent pounding between its different components during ground motion excitation. The wavelet scalograms of the bridge responses indicated pounding occurrence quite well. Hence the conclusions from the numerical studies were verified experimentally. 1. Introduction The different phase vibrations of neighboring buildings or adjacent parts of the same building or bridge can result in pounding under earthquake excitation if the separation distance between them is not sufficient. The pounding can cause considerable damage and even lead to collapse of structures, for example, the bridges with columns of unequal heights [1, 2]. Damage of buildings and bridges due to pounding has been documented in the reports of many earthquakes by researchers. The existed pounding research concentrated on modeling of pounding systems, parameter investigations, and mitigation approaches. Most mathematical pounding modeling methods fall into two categories: (a) stereomechanical impact approach, which is primarily based on impulse-momentum law; (b) contact element approach, a force-based approach. The first approach was used in [3] and other literature. Hertz contact model, a contact element approach, has been extensively used to model impact [4¨C7]. The numerical study portion of this paper used this model. With the development of structural health monitoring systems in bridges and other civil structures, the
%U http://www.hindawi.com/journals/aav/2012/805141/