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Training in European Asset Management

Enhancing Structural Capacity

Researcher - Azade Attari

 

Institute:

University College Dublin, Ireland

Supervisor(s):

Ciaran Mc Nally and Mark Richardson

Project Description:

Reliability-based modelling of chloride-induced corrosion in reinforced concrete

The goal of this project is to develop a new reliability analysis approach for time dependent deterioration through the incorporation of recent advances in concrete durability assessment and corrosion science. This will be achieved using a combination of laboratory testing, field testing and statistical analysis.

 

 

Researcher - Andreas Ottosson

 

Institute:

Ramboll, Denmark

Supervisor(s):

Claus Pedersen (Ramboll) and Alan O´Connor (TCD)

Project Description:

Application of stochastic safety assessment techniques to advanced fatigue models  

The aim for this project is to provide a more realistic evaluation of the capacity of structures at the fatigue limit state compared to existing assessment codes. This is done by combining the principles of stochastic safety assessment, advanced structural capacity models and load models based on railway WIM data. Various load models and the influence of different fatigue variables are studied in order to investigate if correction factors can be used on existing load models in order to get a fatigue assessment with a resemblance closer to the one using load models based on WIM data.

 

 

Researcher - Raelize du Plooy

 

Institute:

Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR), Nantes, France

Supervisor(s):

Xavier Dérobert, Sérgio Palma Lopes and Géraldine Villain

Project Description:

Development and combination of non-destructive electromagnetic evaluation techniques for assessing cover concrete condition prior to corrosion 

This research project shall address the development of specific electromagnetic (EM) techniques and the design of a combined methodology. The EM techniques to be studied are: DC-Resistivity imaging (Electrical Resistivity Tomography, ERT), frequency domain capacitive mapping (intermediate frequency spectrum) and time domain Ground Penetrating Radar (GPR) techniques. The corresponding EM observables are known to be significantly sensitive to various state parameters such as water content, density (porosity), water salinity and temperature.

The first stage will concentrate on describing the relationships between the electromagnetic observables and the parameters having an influence on the initiation of a corrosion process (mainly: chloride and water contents), while the second stage will focus on the development and validation of EM mapping (imaging) methodologies.

 

 

Researcher - Amir Hossein Sohrabpour 

 

Institute:

ABM

Supervisor(s):

Mr. F. Hosseini (ABM) and Dr M. Long (UCD)

Project Description:

Soil Structure Interaction and its effects on designing concrete buried structures  

This project will seek to use some of new techniques to produce a new simple design method for the buried structures by considering the soil structure interaction effects. The displacement of full scale culvert during the backfilling process and also under live load will be monitored. The stiffness of backfill material by performing different in-situ tests will be measured. These information will be used to model the culvert in FE program which will be validated against laboratory experiments.

 

Researcher - Hadi Kazemi-Kamyab

 

Institute:

Laboratory of Maintenance and Safety of Structures (MCS), Ecole Polytechnique Fédérale de Lausanne (EPFL)

Supervisor(s):

Prof. Dr. E. Brühwiler and Dr. E. Denarié

Project Description:

Thermo-Hygro-Mechanical Effects In UHPFRC-Concrete Composite Members

The proposed research project would specifically provide fundamental information on the influence of (1) concrete substrate conditions (hygral interactions), (2) temperature (low monotonic temperatures and realistic temperatures) on early age volume changes (autogenous shrinkage, drying shrinkage) and stress development (restrained shrinkage) and other mechanical properties of a UHPFRC recipe from an early age up to 28 days. Therefore the objectives of this research are the following:

  1. Study the effect of low temperatures (5 to 20°C) on the development of mechanical properties, free deformations and eigenstresses of UHPFRC at very early age, up to 28 days.
  2. Study the effect of hygral transport at very early age in UHPFRC, from or to outside, and with concrete substrate.
  3. Provide new models able to predict the free deformations and eigenstresses for temperatures between 5 to 30°C and use the existing hygral transport models to predict the moisture diffusion and moisture profiles in UHPFRC.
  4. Apply the findings and models to optimize the conditions of application of UHPFRC in composite structures: limit temperatures for application, recommended moist curing, preparation of substrate, etc.