Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark Fatigue of Grouted Joint Connections with High Performance Concrete Fabian Wilke

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 2 Grouted Joints Tests & Results Material Model & Damage Simulation

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 3 Grouted Joint – a hybrid connection transition piece Sleeve Grout Pile Grout

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 4 Grouted Joints - Classification Structural

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 5 Grouted Joints – Classification Actions Monopile M >> F Pile-Sleeve M / F Jacket F >> M

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 6 Connection Steel-HPC-Steel Limited test experience No ”real“ design procedure HPC NSC Motivation © DENSIT A/S Scale 1 : 11.5

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 7 Test Programme small scale specimen scale tests 1 : 6.5 industry support by SIAG Stahlbau AG, DENSIT A/S, Vallourec & Mannesmann Diameter: max. 850 mm Length: 7500 mm

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 8 Results without shear keys with shear keys

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 9 Results  use shear keys (Type C) 0° 90° -90° M = F x e e

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 10 Material Modeling & Damage multi-parameter fracture surfaces damage evolution oo oo Palmgren-Miner HAIGH-WESTERGARD-SPACE

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 11 Implementation update in steps of n cycles Transfer function Damage Stiffness update + strain of node i Load degraded stiffness

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 12 Fatigue test & Simulation Fatigue: tested with  Pile = 143 N/mm² Simulation

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 13 Damage Model

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 14 The Proof! deformation u [mm] Load [kN] fatigue damaged specimen (N =2 *10 6 ) envelope ultimate limit state

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 15 Summary & Outlook Damage nonlinearities have to be considered Local deterioration does not lead to brittle failure Shear keys have to be considered the numerical assessment

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 16 Outlook Thank for your attention ! PhD

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 17

Institute for Steel Construction – Leibniz University of Hannover 2. PhD Seminar on Wind Energy in Europe October 4th and 5th 2006 at Risø National Laboratory, Roskilde, Denmark 18 Grouted Joints – Classification Actions Monopile M >> F Pile-Sleeve M / F Jacket F >> M