ANKERPL
Intitulé du projet de recherche : Optimized Anchor Plates in Steel- and Composite Constructions with regard to Construction Management and Load Bearing Capacity
Référence: F1R-ING-PUL-05ANKP
Chef de projet: Christoph Odenbreit
Equipe des chercheurs: Stephan Fromknecht (Doctorant), Michael Scheuern, Danièle Waldmann, Arno Zürbes, Stefan Maas
Domaine de recherche: Engineering / Génie Civil
Durée du projet: 01.06.2005 – 31.05.2008
Partenaires: Prof. Dr.-Ing. U. Dorka Universität Kassel (D), J. Hoffmann, L.-G. Cajot Arcelor/ ProfilARBED,Esch /Alzette, (L), V. Krier ASTRON Building S.A. Diekirch (L)
Objectifs:
The engineer should have the possibility to calculate the characteristic resistances of anchor plates in combination of the concrete structure with its reinforcement and the real load flux
- Anchorage reinforcement leads to a great decrease of the allowable forces, although meant to increase them. This does not correlate to test results and should be researched. Therefore more precisely use of shear/tension anchorage reinforcement should be enabled
- Reduction of allowable edge distances in combination with reinforcement should be researched
- Assembly improvement should be given
Résultats:
To verify a model for the internal load flux a test series of Anchor bolts in reinforced concrete blocks similar to anchor plate constructions was conducted.
The internal load flux model consisting of a 3-dimensional concrete and reinforcement framework is not covered by the technical approval.
The results show a 40 to 50% higher ultimate force of the tested constructions compared to similar designed headed stud constructions, calculated after the current European approval. The load transfer capability of the anchor bolts are nearly reached, giving a more efficient result.
The next tests - currently conducted – consist of anchor plates in reinforced concrete columns with intensive use of anchorage reinforcement.
These tests are in addition simulated by FE-Modelling. The following points have to be implemented into the FEM-Model in order to bring the mathematical simulation closer to reality: (a) refine 3D- material properties, (b) for the concrete material model properties in tension and parabolic in pressure have to be added, (c) in the region at the anchor plate a three-dimensional pressure model after Drucker-Prager should be added, (d) contact elements between anchor plate or headed studs and the concrete have to be added and tested (penalty stiffness, shear function), (e) the different reinforcements have to be added either as 2d- or 3d-elements (contact problem, 3D-Material properties).
