Opportunities for Additional Graduation Work (CIE5050-09)
Creep Behaviour of Resin used in Injected Bolted Connections
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Opportunities for Additional Graduation Work (CIE5050-09)
Creep Behaviour of Resin used in Injected Bolted Connections
Injection bolts have been used successfully in engineering practice to prevent slip (relative displacement between members) in bolted shear connections. Slip is prevented by epoxy resin
that is injected through the specially designed bolt head into the bolt-to-hole clearance. Injected
bolted connections are an alternative to preloaded bolted shear connections, and have the
advantage that no preparation of the faying surfaces is required. This allows for easy application
of injection bolts in new structures or existing connections (e.g. during renovation). In case
of connections with large fabrication or execution tolerances, any remaining gap can be filled
using epoxy. An example of such application is the shear connection between a prefabricated
concrete slab and a steel beam. Research in the field of injection bolts at TU Delft started in the
1970s, and currently is a high priority in order to achieve demountable and reusable composite
structures to reduce both waste and CO2 emissions. One of the challenges is to determine the
creep behaviour of the epoxy resin, because creep negatively affects the (effective) stiffness of
injected bolted shear connections.
We are looking for a student interested in injected bolted shear connections, and we have
the following challenges to be solved within an Additional Master Thesis (CIE5050-09):
- Developing of a test set-up for a uniaxial creep test on epoxy resin (RenGel SW404 + HY2404)
- Determining the creep behaviour of epoxy resin at various stress levels
- Fitting the experimental creep behaviour to a creep model using finite element software (ABAQUS)
- Comparing creep behaviour observed in tests (results available) on injected bolted steel- to-steel shear connections to predictions based on finite element analysis
- Determining the positive effect of material con nement and the resulting multiaxial stress state on the reduction of creep-induced slip
For more info please contact:
ir. M.P. (Martin) Nijgh | M.P.Nijgh@tudelft.nl
prof.dr.ir. M. (Milan) Veljkovic | M.Veljkovic@tudelft.nl
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