Neumarkt bridge (case study)

The Neumarkt bridge located in northern Italy was built in 1969. The pre-stressed and pre-cast structure is a roadbridge with heavy two lane traffic.

Object description

(No object description available.)

Civil engineering type

:

Road network Bridge

Year of construction

:

1969

Composed of materials

:

Prestressed concrete, Steel

Location coordinates

:

46° 20' 6.90" N, 11° 16' 37.36" E

Country

:

Italy

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Object analysis

A multi-level assessment of the current condition and remaining lifetime due to corrosion of the prestressing system is presented. Time-variant chloride concentration distribution at various locations was predicted with the cellular automata technique and pitting corrosion was evaluated. Non-linear deterministic and probabilistic analyses were carried out for the original state and the degraded state of the structure.

Case type

:

Research

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Object state

The application of de-icing salts resulted in visible damages on the structure. Visual condition of Columns: Massive concrete spalling, Column head confine installed. Condition of Girder: Sealing defect, Obvious rust stains. A nonlinear FE Model was created for a 2D simulation of a critial girder. The calibration was done with original static documents. The identification of chloride feed was carried out by extracting drilling cores and drilling powder samples. A simulation of the chloride ingress was carried out using Cellular Automata ((CATES, Jan Podroužek). With the simulation a mapping of areas with critical Cl- concentration could be created. The reliability and life time analysis of concrete bridges subjected to corrosion entails several important steps: (calibrated) mechanical model of the undamaged structure, stochastic models, (inverse) identification of relevant mechanical and environmental loads, definition of critical limit states, prediction of chloride concentration, and corrosion and mapping to mechanical changes.

Observed deterioration processes

:

Chloride induced corrosion, Corrosion

Observed damage types

:

Material loss, Spalling, Material loss of reinforcement steel, Excessive deformation, Delamination

Performance indicators

:

Chemical properties, Material mechanical properties

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This case study was contributed by Lisa Ptacek of Universität für Bodenkultur Wien. Last edited by technical staff.