An improved modal strain energy method for structural damagedetection, 2D simulation

Structural damage detection using modal strain energy (MSE) is one of the most efficient and reliable structural health monitoring techniques. However, some of the existing MSE methods have been validated for special types of structures such as beams or steel truss bridges which demands improving the available methods. The purpose of this study is to improve an efficient modal strain energy method to detect and quantify the damage in complex structures at early stage of formation. In this paper, a modal strain energy method was mathematically developed and then numerically applied to a fixed-end beam and a three-story frame including single and multiple damage scenarios in absence and presence of up to five per cent noise. For each damage scenario, all mode shapes and natural frequencies of intact structures and the first five mode shapes of assumed damaged structures were obtained using STRAND7. The derived mode shapes of each intact and damaged structure at any damage scenario were then separately used in the improved formulation using MATLAB to detect the location and quantify the severity of damage as compared to those obtained from previous method. It was found that the improved method is more accurate, efficient and convergent than its predecessors. The outcomes of this study can be safely and inexpensively used for structural health monitoring to minimize the loss of lives and property by identifying the unforeseen structural damages.

[1]  David P. Thambiratnam,et al.  Structural health monitoring in Australia , 2011 .

[2]  David P. Thambiratnam,et al.  Correlation-Based Damage Detection for Complicated Truss Bridges Using Multi-Layer Genetic Algorithm , 2012 .

[3]  Amin Ghafooripour,et al.  Damage detection in Jacket type offshore platforms using modal strain energy , 2009 .

[4]  Tommy H.T. Chan,et al.  Damage detection for truss bridge structures using correlation-based structural modal strain energy , 2010 .

[5]  S. Law,et al.  Structural Damage Detection from Modal Strain Energy Change , 2000 .

[6]  Wang-Ji Yan,et al.  Statistic structural damage detection based on the closed-form of element modal strain energy sensitivity , 2012 .

[7]  Shuqing Wang.  Iterative modal strain energy method for damage severity estimation using frequency measurements , 2013 .

[8]  S. M. Seyedpoor.  A two stage method for structural damage detection using a modal strain energy based index and particle swarm optimization , 2012 .

[9]  David P. Thambiratnam,et al.  Vibration based structural damage detection in flexural members using multi-criteria approach , 2009 .

[10]  M. Kısa,et al.  Modal analysis of cracked cantilever composite beams , 2005 .

[11]  Y. J. Yan,et al.  Damage Detection Method for Composite Structures Based on a Combined Technique of Cross Modal Strain Energy and Niche Genetic Algorithms , 2010 .

[12]  Li Li,et al.  Numerical methods for evaluating the sensitivity of element modal strain energy , 2013 .

[13]  Wei-Jun Lu,et al.  Damage detection of circular hollow cylinder using modal strain energy and scanning damage index methods , 2011 .

[14]  Limin Sun,et al.  Comparison and improvements of two damage identification methods based on modal strain energy , 2011, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[15]  Volkmar Zabel,et al.  An automatic mode pairing strategy using an enhanced modal assurance criterion based on modal strain energies , 2010 .

[16]  Tommy H.T. Chan,et al.  Health monitoring of short-and medium-span bridges using an improved modal strain energy method , 2013 .

[17]  Min Zhang,et al.  Estimation of semi-rigid joints by cross modal strain energy method , 2013 .

[18]  K. Ramanjaneyulu,et al.  Multi-stage approach for structural damage identification using modal strain energy and evolutionary optimization techniques , 2011 .

[19]  S. Fawzia,et al.  An Improved Method to Detect Damage Using Modal Strain Energy Based Damage Index , 2012 .

[20]  Sanfeng Zhang,et al.  Damage Detection in Roads and Bridges Based on Modal Strain Energy Method , 2013 .