Condition Assessment of Aged Structures

Any structural system in service is subject to age-related deterioration, leading to potential concerns regarding maintenance, health & safety, environmental and economic implications. Condition Assessment of Aged Structures is an invaluable, single source of information on structural assessment techniques for marine and land-based structures such as ships, offshore installations, industrial plant and buildings. Topics covered include: - Current practices and standards for structural condition assessment - Fundamental mechanisms and advanced mathematical methods for predicting structural deterioration - Residual strength assessment of deteriorated structures - Inspection and maintenance of aged structures - Reliability and risk assessment of aged structures Professionals from a broad range of disciplines will be able to gain a better understanding of current practices in the field, how to apply the latest advanced design and development technologies in condition assessment, and what future trends might be.

Table of Contents:
PART 1. CURRENT PRACTICES Current Practices in Condition Assessment of Aged Ships and Floating Offshore Structures, G Wang, C Serratella and S Kalghatgi, American Bureau of Shipping (ABS), USA Introduction International association of classification societies (IACS) and vessel inspections by classification societies International maritime organization (IMO), flag and port states Industry self-regulation and voluntary inspections Design, maintenance, inspection and repair of ship structures Design, maintenance, inspection and repair of floating offshore structures Nondestructive examination and monitoring Challenges and future trends Sources of further information and advice Acknowledgement References Appendix: abbreviations used in this chapter Current Practices in Condition Assessment of Aged Fixed-Type Offshore Structures, I Lotsberg, Det Norske Veritas (DNV), Norway Introduction Design standards and acceptance criteria for assessment Process for structural assessment Collection of data from design, fabrication, transportation, installation and from in-service life Assessment of data and structural analyses Mitigation Future trends Sources for further information and advice References Definition and Assessment of Deficiencies in Building Construction, A van Grieken, Connell Wagner Pty Ltd, Australia Historical perspective History of global construction developments The Australian experience The benefit of the historical perspective General causes of deficiencies The three types of deficiencies: deterioration, defect and damage Assessment of deficiencies References PART 2. MECHANISMS, MATHEMATICAL MODELS AND PREVENTIVE MEASURES FOR AGE RELATED DETERIORATION Corrosion Wastage in Aged Structures, R E Melchers, The University of Newcastle, Australia Introduction Some fundamental corrosion principles A model based on fundamentals Environmental and other influences Variability and probabilistic models Some other corrosion loss models Coastal atmospheric corrosion Inland atmospheric corrosion Pitting corrosion Discussion Conclusions Acknowledgement References Fatigue Cracking in Aged Structures, W C Cui, China Ship Scientific Research Center, China Introduction Historical overview of metal fatigue Current understanding of fatigue mechanisms Fatigue life prediction methods Preventive measures of fatigue cracking Conclusions References Local Denting and Other Deterioration in Aged Structures, N Yamamoto, Research Institute of Nippon Kaiji Kyokai, Japan Introduction Local deformed damage caused by mechanical external causes Local deformed damage caused by corrosion Conclusions References PART 3. RESIDUAL STRENGTH OF AGED STRUCTURES Corroded Structures and Residual Strength, T Nakai and N Yamamoto, Research Institute of Nippon Kaiji Kyokai, Japan Introduction Probabilistic modeling of corrosion Degradation of hull girder strength Pitting corrosion Equivalent thickness of plates with pitting corrosion Conclusions References Cracked Structures and Residual Strength, F Wang and W C Cui, China Ship Scientific Research Center, China Fundamentals of residual strength of cracked structures Residual ultimate strength of cracked plates Plates with a single crack under ultimate tensile loads Plates with a single crack under ultimate compressive loads Residual strength of plates with multiple collinear cracks Random cracks Ultimate strength of cracked stiffened panels Ultimate strength of cracked ship hull girder Conclusions References Dented Structures and Residual Strength, J K Paik, Pusan National University, Korea Introduction Mechanism of local denting damage Residual ultimate strength characteristics of dented plates Methods of damage detection and their uncertainties Conclusions References PART 4. RELIABILITY OF AGED STRUCTURES Reliability of Aged Ship Structures, Y Garbatov and C Guedes Soares, Technical University of Lisbon, Portugal Introduction Time dependent hull section modulus subject to crack growth Effect of corrosion on the hull section modulus Time dependent section modulus of a hull with cracks and corrosion Time dependent reliability of the ship hull girder Modelling crack inspections and reliability Modelling corrosion inspection and reliability Time dependent reliability of ship hull subjected to fatigue and corrosion failure Numerical example Discussion and conclusions Acknowledgments References Reliability of Aged Offshore Structures, T Moan, Norges Teknisk-Naturvitenskapelige Universitet (NTNU), Norway Introduction Current design practice for offshore structures Inspection and maintenance of offshore structures Concluding remarks on component design criteria System failure criteria for offshore structures General description of uncertainty modelling Load effects on offshore structures Structural reliability analysis Fatigue reliability System reliability Updating variables in reliability analysis Decision making during design and in service Target safety level Improving the reliability of offshore structures Conclusions References Reliability of Aged Land-Based Structures, R E Melchers, The University of Newcastle, Australia Introduction Components in structural reliability Outline of structural reliability theory Structural systems reliability General approach Deteriorating structures Conclusion References PART 5. INSPECTION AND MAINTENANCE Inspection of Aged Ships and Offshore Structures, C M Rizzo, University of Genova, Italy Reasons for inspections The inspection event Current inspection practices Detection and sizing methods Structural monitoring Acknowledgement References Inspection of Aged Land-Based Structures, A van Grieken, Connell Wagner Pty Ltd, Australia Introduction Six reasons for assessment Assessment outcome and sequence Concrete structures Masonry structures Steel structures References Maintenance of Aged Ships and Offshore Structures, C M Rizzo, University of Genova, Italy Maintenance strategies Current maintenance and repair practices Temporary repairs Permanent repairs Examination and testing of repairs References Maintenance of Aged Land-Based Structures, A van Grieken, Connell Wagner Pty Ltd, Australia A structured approach Key considerations Documentation Site phase of the works Repair and protection of concrete structures Brickgrowth repairs Repair of metal structures References Risk-Based Inspection and Maintenance of Aged Structures, C Serratella, G Wang and K Tikka, American Bureau of Shipping (ABS), USA Introduction Risk based aapproaches Fundamentals of risk based approaches Risk based inspection (RBI) Risk based maintenance (RBM) Risk based repairs (RBR) Future trends References

About the Author :
Pusan National University, Korea Seoul National University, Korea University of Newcastle, Australia