Agenda 196th Stufib-meeting

1) Opening and welcome Haskoning

2) Announcements from the board
Ton van Beek

3) Minutes of the 194th and 195th Stufib-meetings

4) New Stufib-members

5) Structural capacity assessment of PC members subjected to different
corrosion-induced damage scenarios
Prof. Beatrice Belletti (University of Parma)

Nowadays several prestressed concrete (PC) structures and infrastructures are beyond their service life and – mainly due to lack of maintenance – a significant part of existing bridges is subjected to deterioration phenomena induced by corrosion.
An analytical method for the capacity assessment of PC bridge girders – prestressed with strands subjected to different intensity and extension levels of chloride induced corrosion – is presented.
Finally, some methods adopted to correlate the superficial damage, detected during visual inspections, with the actual corrosion level in strands are analysed and compared with the measurements obtained with refined techniques, suitable for the description of the corrosion morphology, such as 3D scanning and X-ray tomography.

6) Strut-and-tie models and stress fields: past, present and future
Prof. Walter Kaufmann (ETH Zürich)

Strut-and-tie models and stress fields are powerful tools for the design of reinforced concrete, providing an intuitive understanding of the force flow and enabling consistent dimensioning including reinforcement detailing. Yet, strut-and-tie models are still mainly used by hand, which requires engineering judgement and impairs productivity, particularly if serviceability criteria must be verified and in the assessment of existing structures. Various computer programs have been developed over the past decades in order to mitigate these productivity issues.
The presentation will summarise the historical development of strut-and-tie models and stress fields, including their theoretical background. Furthermore, it will present an overview of their current state-of-the-art and an outlook into future developments addressing the limitations of existing computer programs.

Break

7) From national monument to sustainable office, Transformation of Geosciences faculty into Haskoning office
Koos Tolsma (Haskoning)

The faculty of mining was built from 1908 until 1910 and contains one of the earliest examples of concrete floors in the Netherlands, to support the weight of the cabinets with minerals. Once designed for 80 students and professors, it now has been transformed to a office building for 800 people of Haskoning. One of the challenges was to create the first Paris Proof National Monument in the Netherlands, by reducing the energy use and improve the insulation. In this presentation the research into the existing structure and the structural design of the new roof will be presented.

8) Guided tour Haskoning office

Questions and closing no later than 21.30