PROCESSING OF STRUCTURAL RESPONSES VIA WAVELET TRANSFORM FOR DETECTING DAMAGES UNDER EARTHQUAKE EXCITATION

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AMOOZADEH A.; FADAVI AMIRI M.; ZARE HOSSEINZADEH A.; GHODRATI AMIRI G.

Title

PROCESSING OF STRUCTURAL RESPONSES VIA WAVELET TRANSFORM FOR DETECTING DAMAGES UNDER EARTHQUAKE EXCITATION

Author(s)

AMOOZADEH A. | FADAVI AMIRI M. | ZARE HOSSEINZADEH A. | GHODRATI AMIRI G. | Issue Writer Certificate

Keywords

STRUCTURAL HEALTH MONITORINGQ2

DAMAGE DETECTIONQ1

TIME HISTORY RESPONSEQ2

WAVELET TRANSFORMQ1

BILINEAR STIFFNESS MODELQ2

Abstract

Structural damage identification can be considered as the main step in STRUCTURAL HEALTH MONITORING (SHM). There are many different methods which use structural dynamic responses for damage prognosis. Although some of them are concentrated on solving an inverse problem for damage identification, others suggest a direct procedure for defect detection. Despite the good performance of these methods in damage identification, researchers are attempting to find efficient and simple methods for damage identification with high level of accuracy. This paper presents a reference-free method for structural damage identification under earthquake excitation. Damages are defined by some changes in the special instants during an earthquake occurrence, and structural TIME HISTORY RESPONSEs are used as an input signal for discrete wavelet analysis. Finally the “detail coefficients” are inspected for determination of the damage characteristics including the appearance, the time sequence, and the location of damage(s). Although the peak values in the detail coefficients can show the existence and time sequence of damage, these peak values must be inspected for determining the damage location and finding the maximum value. As a result, the element associated with a signal which has the maximum peak value, can be considered as the damaged element. Applicability of the presented method is demonstrated by studying three numerical examples. The first is devoted to damage identification in a four-story shear frame. It is assumed that all of the stories are equipped by sensors for recording structural responses. Three different damage scenarios with single and multiple damage cases are studied under two samples of earthquake records, namely El-Centro (1940), and Northridge (1994) earthquakes. In addition, the effects of using different wavelet mother functions and different input signals, such as displacement and velocity responses, are investigated in this research. Obtained results emphasize on the applicability of the presented method in damage identification. In the second example, a simple concrete beam is considered with ten elements for simulating two different damage scenarios. In this case, applicability of the method is inspected by considering only the transitional degrees of freedom (DOF) as the equipped DOFs by sensors. This can be interpreted as using limited number of sensors. In addition, the displacement time histories are used for damage identification. In order to reach a clear strategy in damage localization, two rules are proposed for judging about elements’ health. The rules are based on seeking maximum values of the wavelet coefficients in the damaged instants. Obtained results show the reliable performance of the presented method in finding time sequence of damage occurrence and damage location. In the third example, applicability of the presented method is investigated in the presence of complex damage models by defining bilinear stiffness reduction. Although the damage can cause some reduction in the effective stiffness of damaged structures of this case, the reduction is different in positive and negative displacements. Two different damage scenarios are simulated on a single DOF structure under different excitations, namely earthquake excitations and generated White Noise excitation. Obtained results reveal the robustness of the presented method in damage prognosis in the presence of complex damage models.

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APA: Copy

AMOOZADEH, A., FADAVI AMIRI, M., ZARE HOSSEINZADEH, A., & GHODRATI AMIRI, G.. (2016). PROCESSING OF STRUCTURAL RESPONSES VIA WAVELET TRANSFORM FOR DETECTING DAMAGES UNDER EARTHQUAKE EXCITATION. MODARES CIVIL ENGINEERING JOURNAL, 16(5 (SUPPLEMENT)), 103-117. SID. https://sid.ir/paper/256697/en

Vancouver: Copy

AMOOZADEH A., FADAVI AMIRI M., ZARE HOSSEINZADEH A., GHODRATI AMIRI G.. PROCESSING OF STRUCTURAL RESPONSES VIA WAVELET TRANSFORM FOR DETECTING DAMAGES UNDER EARTHQUAKE EXCITATION. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2016;16(5 (SUPPLEMENT)):103-117. Available from: https://sid.ir/paper/256697/en

IEEE: Copy

A. AMOOZADEH, M. FADAVI AMIRI, A. ZARE HOSSEINZADEH, and G. GHODRATI AMIRI, “PROCESSING OF STRUCTURAL RESPONSES VIA WAVELET TRANSFORM FOR DETECTING DAMAGES UNDER EARTHQUAKE EXCITATION,” MODARES CIVIL ENGINEERING JOURNAL, vol. 16, no. 5 (SUPPLEMENT), pp. 103–117, 2016, [Online]. Available: https://sid.ir/paper/256697/en

Scientific Information Database

ISSN: 2588-4824

Journal Paper

PROCESSING OF STRUCTURAL RESPONSES VIA WAVELET TRANSFORM FOR DETECTING DAMAGES UNDER EARTHQUAKE EXCITATION