Damage detection of building structures under ambient excitation through the analysis of the relationship between the modal participation ratio and story stiffness

2018 ◽  
Vol 418 ◽  
pp. 122-143 ◽  
Author(s):  
Hyo Seon Park ◽  
Byung Kwan Oh
Keyword(s):  
Damage Detection ◽  
Building Structures ◽  
Participation Ratio ◽  
Ambient Excitation ◽  
The Relationship

scholarly journals Damage Detection on Sudden Stiffness Reduction Based on Discrete Wavelet Transform

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Bo Chen ◽  
Zhi-wei Chen ◽  
Gan-jun Wang ◽  
Wei-ping Xie
Keyword(s):  
Wavelet Transform ◽  
Damage Detection ◽  
Discrete Wavelet Transform ◽  
Sudden Change ◽  
Damage Index ◽  
Time Instant ◽  
Discrete Wavelet ◽  
Building Structures ◽  
Stiffness Reduction ◽  
Shear Building

The sudden stiffness reduction in a structure may cause the signal discontinuity in the acceleration responses close to the damage location at the damage time instant. To this end, the damage detection on sudden stiffness reduction of building structures has been actively investigated in this study. The signal discontinuity of the structural acceleration responses of an example building is extracted based on the discrete wavelet transform. It is proved that the variation of the first level detail coefficients of the wavelet transform at damage instant is linearly proportional to the magnitude of the stiffness reduction. A new damage index is proposed and implemented to detect the damage time instant, location, and severity of a structure due to a sudden change of structural stiffness. Numerical simulation using a five-story shear building under different types of excitation is carried out to assess the effectiveness and reliability of the proposed damage index for the building at different damage levels. The sensitivity of the damage index to the intensity and frequency range of measurement noise is also investigated. The made observations demonstrate that the proposed damage index can accurately identify the sudden damage events if the noise intensity is limited.

scholarly journals Subspace-based damage detection under changes in the ambient excitation statistics

2014 ◽  
Vol 45 (1) ◽  
pp. 207-224 ◽  
Author(s):  
Michael Döhler ◽  
Laurent Mevel ◽  
Falk Hille
Keyword(s):  
Damage Detection ◽  
Ambient Excitation

Using the Detection and Relative Damage Quantification Indicator (DRQ) with Transmissibility

2007 ◽  
Vol 347 ◽  
pp. 455-460 ◽  
Author(s):  
N.M.M. Maia ◽  
A.M.R. Ribeiro ◽  
M. Fontul ◽  
D. Montalvão ◽  
R.P.C. Sampaio
Keyword(s):  
Power Spectrum ◽  
Damage Detection ◽  
Damage Quantification ◽  
Relative Damage ◽  
Statistical Sense ◽  
Ambient Excitation ◽  
Response Vector

The Detection and Relative Damage Quantification Indicator (DRQ) was presented previously as a reliable damage detection indicator when used with Operational Deflection Shapes (ODS). The DRQ was computed from the Response Vector Assurance Criterion (RVAC) between the damaged and the initial ODS and the resulting value proved to be a good indicator of the presence of damage. The use of the ODS implies that the loads applied to the structure with and without damage are either known or, at least, the same. If the forces are not deterministic but still ergodic, the power spectrum could be used to evaluate the ODS, but still the above conditions hold, in a statistical sense. When a structure is subjected to ambient excitation, those conditions can hardly be assured. The loads may vary quite significantly and the ODS changes may be due to those changes instead of the presence of damage. To avoid this handicap, the authors explore here the use of the Transmissibility functions. If properly defined, the Transmissibility is invariant with respect to the amplitude of the loads. Since the Displacement Transmissibility is load invariant, a picked set of responses can be measured in service and used to predict another set; the result will then be correlated to the actual values using the RVAC and the DRQ will be computed. Numerical and experimental examples illustrate the proposed technique.

scholarly journals Use of GIS to Evaluate Minor Rural Buildings Distribution Compared to the Communication Routes in a Part of the Apulian Territory (Southern Italy)

2019 ◽  
Vol 11 (17) ◽  
pp. 4700 ◽  
Author(s):  
Marco Parlavecchia ◽  
Simone Pascuzzi ◽  
Alexandros Sotirios Anifantis ◽  
Francesco Santoro ◽  
Giuseppe Ruggiero
Keyword(s):  
Information System ◽  
Southern Italy ◽  
Building Structures ◽  
Urban Centers ◽  
Regional Area ◽  
Rural Buildings ◽  
Gis Software ◽  
The Relationship ◽  
Typological Classification

The aim of this paper is to analyze the relationship between minor rural buildings and the most relevant communication routes of the regional area made up of six municipalities which, until 2016, formed the Local Action Group Sud Est Barese (LAG SEB): Acquaviva delle Fonti, Casamassima, Conversano, Mola di Bari, and Noicattaro e Rutigliano (Apulia, Italy). Information on the territorial distribution and typological classification of buildings was obtained by the official cartography of Military Geographic Institute (IGM, 1:25,000) and the Regional Technical Map (CTR, 1:5000) using the Geographic Information System (GIS) software ArcMap ArcGis 10.1. IGM cartography was chosen due to the greater amount of information pertaining to typological classification as well as to toponymy identification. CTR cartography, used as a second cartographic source, has been useful for acquiring more up-to-date territorial information compared to the IGM, in particular concerning the infrastructures of the territory. Moreover, the use of the CTR has allowed us to verify whether buildings listed on IGM cartography still exist. The cartographic calculations have allowed us to investigate possible relationships between the typology and distribution of rural buildings and the network of public roads and urban centers. The study of the connection between building types, roads and urban centers has allowed us to better understand the spatial distribution criteria, thus acquiring useful information to outline intervention policies, the implementation of which would be used to attempt to recover and improve building structures.

Shaft Crack Detection Using Statistical Analysis

2009 ◽  
Author(s):  
Zhuang Li ◽  
Lei Jin ◽  
Ning Zhang ◽  
Yang Zhou
Keyword(s):  
Statistical Analysis ◽  
Damage Detection ◽  
Crack Detection ◽  
Damage Identification ◽  
Vibration Data ◽  
Rotating Systems ◽  
Detection And Diagnosis ◽  
The Relationship ◽  
Cracked Shafts ◽  
Damage Types

Cracks and voids are common defects in rotating systems and are a precursor to fatigue-induced failure. The application of statistical analysis, as a tool for damage identification and health monitoring in rotating machinery, is investigated. Experimental vibration data were collected for a set of health and cracked shafts. Formal statistical models have been proposed to describe the relationship between the vibration signals and the existence of damage. Damage detection and diagnosis are implemented based on statistical estimation and hypothesis testing. Such a statistical model provides a screening technique to detect other damage types. As a result, the proposed methods can improve the power of damage detection.

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