Static and Dynamics of Structures
Large scale static loading tests
The unit for Structural Engineering offers experts from the construction and mechanical engineering field the possibility to carry out large scale static test on our strong floor (18 m x 40 m). In addition to force measurements and conventional displacement and strain recording by means of LVDTs and strain gauges, new innovative technique such as full-field image correlation systems can also be offered. The long experience of our team combined with an excellent laboratory equipment guarantee excellent testing conditions.
- In-Situ monitoring and load testing of structures for the verification of calculated characteristics.
- Determination of the elastic constants of anisotropic materials.
Contact: Dr. Glauco Feltrin, Dr. Christoph Czaderski,
RESEARCH AND DEVELOPMENT
Since 1956 the braking forces in the Swiss codes have significantly increased (0 kN in 1956, up to 900 kN in 2003). Because of this development, most of the existing bridges in Switzerland have been designed for braking forces that are much smaller than the provisions of the current codes, which are based on a deterministic model. Therefore, it is very likely that a significant number of bridges shows a nominally insufficient structural safety. Using a stochastic traffic flow model, an empirically founded model for simulating the braking of heavy vehicles on bridges shall be developed.
Funding: ASTRA, Arbeitsgruppe Brückenforschung
Contact: Dr. Glauco Feltrin, João Martins
Influence of mastic-asphalt pavement on natural frequencies and modal dampings of footbridges
Timber bridges with decks made of laminated solid timber panels are often protected against mechanical abrasion and humidity with a mastic asphalt pavement. Measurements performed on a footbridge demonstrated that the bond between panel and pavement may produce significant temperature induced changes of natural frequencies and modal dampings.
Funding: Fonds zur Förderung der Wald- und Holzforschung
Contact: Dr. Glauco Feltrin, Dr. René Steiger, Dr. Benedikt Weber
Large Scale Testing with full Field Deformation Measurement
Contactless surface covering measurements are more and more frequently used in civil engineering for tests on construction units and in research at Empa.
The disadvantages of punctual measurements with strain gauges, mechanical displacement sensors may be avoided. The measuring results deliver the shape of the specimen surface and full field ditributions of strains and displacements in three orthogonal directions.
Contact: Dr. Christoph Czaderski