Damage identification in reinforced concrete structures by dynamic stiffness determination

Service loads, environmental and accidental actions may cause damage to constructions. Regular inspection and condition assessment of engineering structures are necessary so that the early detection of any defect can be made and the structure's remaining safety and reliability can be determined. When the structural damage is small or it is in the interior of the system, its detection cannot be carried out visually. A useful more elaborate non-destructive evaluation tool is vibration monitoring. It relies on the fact that the occurrence of damage or loss of integrity in a structural system leads to changes in the dynamic properties of the structure. In this paper, different techniques will be presented and compared to derive from experimentally determined modal characteristics of a reinforced concrete beam its dynamic bending stiffness. The degradation of stiffness, due to the cracking of the reinforced concrete, gives information on the position and severity of the damage that has occurred.

[1]  Roberto A. Osegueda,et al.  Damage localization in a space truss model using modal strain energy , 1997 .

[2]  A. Messina,et al.  A frequency-change correlation approach to damage detection , 1997 .

[3]  Robert Y. Liang,et al.  Fault identification of beams on elastic foundation , 1995 .

[4]  Arun Kumar Pandey,et al.  Damage detection from changes in curvature mode shapes , 1991 .

[5]  G. De Roeck,et al.  Damage localization in reinforced concrete beams by dynamic stiffness determination , 1999 .

[6]  R. Cook,et al.  Concepts and Applications of Finite Element Analysis , 1974 .

[7]  Charles R. Farrar,et al.  VIBRATION TESTING OF THE I-40 BRIDGE BEFORE AND AFTER THE INTRODUCTION OF DAMAGE. , 1994 .

[8]  Charles R. Farrar,et al.  Application of the strain energy damage detection method to plate-like structures , 1999 .

[9]  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 .

[10]  O. S. Salawu.  Detection of structural damage through changes in frequency: a review , 1997 .

[11]  J Maeck,et al.  Dynamic Bending and Torsion Stiffness Derivation from Modal Curvatures and Torsion Rates , 1999 .

[12]  Luc Schueremans,et al.  Stochastic Subspace Techniques applied to parameter identification of civil engineering structures , 1995 .

[13]  John E. Mottershead,et al.  Finite Element Model Updating in Structural Dynamics , 1995 .

[14]  C. Ratcliffe.  DAMAGE DETECTION USING A MODIFIED LAPLACIAN OPERATOR ON MODE SHAPE DATA , 1997 .

[15]  Cecilia Surace,et al.  DAMAGE ASSESSMENT OF MULTIPLE CRACKED BEAMS: NUMERICAL RESULTS AND EXPERIMENTAL VALIDATION , 1997 .

[16]  Masafumi Kato,et al.  VIBRATION OF PC BRIDGE DURING FAILURE PROCESS , 1986 .