Modeling of Steel-Concrete Composite Bridges using equivalent trusses.
Event details
| Date | 10.11.2011 |
| Hour | 11:00 |
| Speaker | Theodoros Adamakos |
| Location |
GC B3 424
|
| Category | Conferences - Seminars |
Plane grillages and Finite Element Models are widely used for the design of bridges. In a grillage idealization the entire superstructure of the bridge is suitably represented by different sets of bar elements. On the other hand the finite element method makes use of plane and solid elements for the three dimensional representation of the structure. Although these models are generally accepted as sufficient accurate they are associated with some drawbacks. To overcome the difficulties of plane grillage and finite element analysis a new improved way of modeling steel composite bridges will be presented.
The proposed model is based on the simulation of steel I-girders through the use of equivalent trusses. Τhe concrete slab is suitably represented by a set of bar elements. In contrast to the grillage model which is usually used for the analysis of bridges the recommended 3D-Model allows for a more reliable prediction of deformations and internal forces while it allows for the introduction of secondary members that play an important role in the bridge behavior. Besides the proposed model can be used for a buckling analysis of the steelwork during concreting offering the buckling shapes and the critical load factors.
The new method of modeling is deemed accurate even for the analysis of curved and skewed bridges while it can predict the special behavior of this type of bridges. Worked examples are provided to illustrate the set up procedure of the proposed modeling and to compare its results with corresponding finite elements models. The work presented in this paper is a part of a research project which is carried out in the National Technical University of Athens for modeling steel and composite bridges.
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Practical information
- General public
- Free
Contact
- Jean-Paul Lebet