A New Approach of evaluating the damage in simply-supported reinforced concrete beam by Local mean decomposition (LMD)

2nd International Conference on Materials Science, Energy Technology and Environmental Engineering

材料科学;能源学;生态环境科学

Zhang, Xuebing^1 ; Liu, Ning^2 ; Xi, Jiaxin^2 ; Zhang, Yunqi^3 ; Zhang, Wenchun^1 ; Yang, Peipei^1

School of Geomatics and Prospecting Engineering, Jilin Jianzhu University, Changchun

130118, China^1

School of Civil Engineering, Jilin Jianzhu University, Changchun

130118, China^2

CNPC Jilin Company, Changchun

130061, China^3

关键词: Elementary methods;    Empirical Mode Decomposition;    Local mean decomposition (LMD);    Non-stationary response;    Reinforced concrete beams;    Structural damages;    Structural diagnosis;    Time-frequency decomposition;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/81/1/012141/pdf
DOI  :  10.1088/1755-1315/81/1/012141

来源: IOP

【 摘 要 】

How to analyze the nonstationary response signals and obtain vibration characters is extremely important in the vibration-based structural diagnosis methods. In this work, we introduce a more reasonable time-frequency decomposition method termed local mean decomposition (LMD) to instead the widely-used empirical mode decomposition (EMD). By employing the LMD method, one can derive a group of component signals, each of which is more stationary, and then analyze the vibration state and make the assessment of structural damage of a construction or building. We illustrated the effectiveness of LMD by a synthetic data and an experimental data recorded in a simply-supported reinforced concrete beam. Then based on the decomposition results, an elementary method of damage diagnosis was proposed.