Damage detection for truss bridge structures using correlation-based structural modal strain energy

This paper presents the feasibility of using structural modal strain energy as a parameter employed in correlationbased damage detection method for truss bridge structures. It is an extension of the damage detection adopting Multiple Damage Location Assurance Criterion (MDLAC). In this paper, the sensitivity of modal strain energy to damage, from the analytical model, is incorporated into the MDLAC method. Firstly, the sensitivity matrix of modal strain energy to damage is conducted offline. For an arbitrary damage case, the fitness function (MDLAC) is calculated by multiplying the sensitivity matrix and damage vector. Then genetic algorithm (GA) is used to iteratively search the damage vector that maximises the correlation between the corresponding modal strain energy change (hypothesised) and its counterpart in measurement. The proposed method is simulated and compared with the conventional methods, e.g. frequency-error method, coordinate modal assurance criterion and MDLAC using mode shapes on a numerical truss bridge structure. The results demonstrate the MDLAC using modal strain energy method can yield acceptable damage detection outcomes with less computing efforts, even in a noise contaminated condition.

[1]  Alireza Rahai,et al.  Damage assessment of structure using incomplete measured mode shapes , 2007 .

[2]  Zhengliang Li,et al.  A two-stage method to identify structural damage sites and extents by using evidence theory and micro-search genetic algorithm , 2009 .

[3]  Jiann-Shiun Lew,et al.  Using transfer function parameter changes for damage detection of structures , 1995 .

[4]  Alex Berman,et al.  Theory of Incomplete Models of Dynamic Structures , 1971 .

[5]  Shirley J. Dyke,et al.  Structural health monitoring for flexible bridge structures using correlation and sensitivity of modal data , 2007 .

[6]  Seamus D. Garvey,et al.  A COMBINED GENETIC AND EIGENSENSITIVITY ALGORITHM FOR THE LOCATION OF DAMAGE IN STRUCTURES , 1998 .

[7]  Walter M. West,et al.  Illustration of the use of modal assurance criterion to detect structural changes in an Orbiter test specimen , 1986 .

[8]  J. Vantomme,et al.  Damage assessment in reinforced concrete beams using eigenfrequencies and mode shape derivatives , 2002 .

[9]  E. J. Williams,et al.  STRUCTURAL DAMAGE DETECTION BY A SENSITIVITY AND STATISTICAL-BASED METHOD , 1998 .

[10]  Hoon Sohn,et al.  A review of structural health monitoring literature 1996-2001 , 2002 .

[11]  R. B. Testa,et al.  Modal Analysis for Damage Detection in Structures , 1991 .

[12]  Charles R. Farrar,et al.  Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: A literature review , 1996 .

[13]  Robert D. Adams,et al.  The location of defects in structures from measurements of natural frequencies , 1979 .

[14]  S. Law,et al.  Structural damage localization from modal strain energy change , 1998 .

[15]  S. S. Law,et al.  DAMAGE LOCALIZATION BY DIRECTLY USING INCOMPLETE MODE SHAPES. TECHNICAL NOTE , 2000 .