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- 2017 (3) (entfernen)
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- Vortrag (2)
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- Englisch (3)
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- Axial force (2)
- Dynamic test (2)
- Modal parameters (2)
- Model updating (2)
- Optimization technique (2)
- Truss structures (2)
- Finite element method (1)
- Finite element model updating (1)
- Iron and steel truss structures (1)
- Optimization strategies (1)
Eingeladener Vortrag
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Based on the state-of-the-art research and advances in dynamic testing methods in the past decades, the research project aims to develop a non-destructive methodology to determine the axial forces and real stress state in existing truss structures making use of the vibration signatures of the natural frequencies and mode shapes. Furthermore, it aims to estimate the joint rigidity of trusses as well as to design structural health monitoring schemes for the safety of existing truss-type structures.
Precise identification of the axial forces and corresponding stresses plays a crucial role for the preservation of existing truss structures. The assessment measures require non–destructiveness, minimum intervention and practical applicability. The work aims to develop a non–destructive methodology to identify the axial forces and stress states in iron and steel truss structures based on vibration measurements and the finite element model updating coupled with optimization techniques.
The inverse identification of the stress state in axially loaded slender members of iron and steel truss structures using measured dynamic data is discussed. A methodology is proposed based on the finite element model updating coupled with nature-inspired optimization techniques, in particular the particle swarm optimization. The numerical model of truss structures is calibrated using natural frequencies and mode shapes from vibration tests, as well as additional information of the axial forces in selected truss members based on the experimentally identified modal parameters. The results of the identification are the axial forces or corresponding stresses in truss structures and the joint rigidity in relation to pinned and rigid conditions.