MS 3-6: Maintenance and Rehabilitation of Aged Bridges

Mark Alexander Ahrens, Ruhr-University Bochum, Germany

Peter Mark, Ruhr-University Bochum, Germany

Mark Alexander Ahrens    Peter Mark    


During the last decades the amount bridges suffering from various damage mechanisms like concrete and reinforcement corrosion, fatigue, abrasion, and many others in time, has significantly increased. After years of service, sometimes even longer than ever scheduled, those bridge structures show a critical state of preservation today. In such cases civil engineers are challenged to decide whether these weakened bridges can withstand an ongoing unrestricted usage, should be strengthened or must be deconstructed and finally replaced by new ones. Obviously and well-founded by economic reasons, strengthening and revitalization are preferred to deconstruction and rebuilt by responsible owners or agencies. Besides, remarkable improvements of standards concerning design methods, theoretical models, as well as relevant design loads has been achieved by the civil engineering community. The same holds true for theoretically sound damage descriptions and realistic progression models as well as sophisticated calculation methods. However, aged structures have generally been built according to codes valid to the time of construction. Compared to current codes such structures possess deficiencies, e.g. concerning minimum reinforcement or fatigue resistance, that have to be handled in course of recalculation. Further, information concerning e.g. material strength, its spatial scatter, or damage states has to be gathered in situ or in additional laboratory experiments to serve as authentic input data in related computer simulations. The symposium "Maintenance and rehabilitation of aged bridges" covers current efforts made in damage assessment, maintenance, strengthening, and revitalization of aged bridges in theoretical as well as structural manner. Especially, the following topics are addressed:

- Modern techniques of structural assessment and bridge stock management
- Recalculation of aged bridges to nowadays standards
- Practical applications of bridge strengthening and revitalization
- Residual life-time assessment considering time-variant damage mechanisms
- Specific strengthening techniques for aged concrete bridges


Precision-assessment of lifetime prognoses based on SN-approaches of RC-structures exposed to fatigue loads
M. Ahrens

Structural flexibility in relation to integrated service life design of buildings
R. Blok, E. Koopman

Modern bridge stock management in a regional metropolis – Structural assessment, data management and cost control
A. Blome, H. Neuß, P. Mark, U. Lambertz

Strengthening of existing bridge decks by additional concrete layers – New research results and design rules
J. Feix, A. Andreatta

Inspection and maintenance of the orthotropic deck of Avonmouth Bridge
B. Frey

Asset management and life cycle cost optimization for bridges on network, asset and element level
M. Hoffmann, A. Kammersberger

Analysis of influential factors and association rules for bridge deterioration using national bridge inventory data
R. Huang, P. Chen

Examples of different strategies of bridge preservation, Part 1
T. Klöker, D. Lehnen

Examplaes of different strategies of bridge preservation, Part 2
D. Lehnen, T. Klöker

Research on computational method on the flexural bearing capacity of a box girder strengthened with carbon fiber sheets
X. Liu, W. Wang, Y. Chen, Y. Wei

Technical cycle of modern bridge maintenance – An overview
P. Mark, M. Ahrens, C. Fust

The application of sacrificial cathodic protection as a corrosion control measure for the protection of reinforced concrete bridges
M. Moore, F. Jesmin, S. Tao, A. Beedles

Nondestructive evaluation of stress state of steel bars reinforcing concrete structures
E. Schneider, S. Balijepalli, C. Boller, P. Bindseil, W. Kurz

Bridge management and effective tools to ensure sustainable construction schedules
T. Tzaveas