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Fatigue of Grouted Joint Connections with High Performance Concrete. Fabian Wilke. Grouted Joints Tests & Results Material Model & Damage Simulation. Grouted Joint – a hybrid connection. Sleeve. Grout. Grout. transition piece. Pile. Pile. Grouted Joints - Classification. Structural.
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Fatigue of Grouted Joint Connections with High Performance Concrete Fabian Wilke
Grouted Joints • Tests & Results • Material Model & Damage • Simulation
Grouted Joint – a hybrid connection Sleeve Grout Grout transition piece Pile Pile
Grouted Joints - Classification • Structural
Grouted Joints – Classification • Actions Monopile M >> F Pile-Sleeve M / F Jacket F >> M
Motivation HPC Scale 1 : 11.5 NSC © DENSIT A/S • Connection Steel-HPC-Steel • Limited test experience • No ”real“ design procedure
Test Programme Diameter: max. 850 mm Length: 7500 mm small scale specimen scale tests 1 : 6.5 industry support by SIAG Stahlbau AG, DENSIT A/S, Vallourec & Mannesmann
Results without shear keys with shear keys
Results 90° 0° -90° e M = F x e use shear keys (Type C)
Material Modeling & Damage Palmgren-Miner o o • multi-parameter fracture surfaces • damage evolution HAIGH-WESTERGARD-SPACE
Implementation Transfer function Damage Stiffness update Load degraded stiffness + strain of node i update in steps of n cycles
Fatigue test & Simulation Simulation • Fatigue: tested with Pile = 143 N/mm²
The Proof! envelope ultimate limit state Load [kN] fatigue damaged specimen (N =2 *106) deformation u [mm]
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
Outlook PhD Thank for your attention !
Grouted Joints – Classification • Actions Monopile M >> F Pile-Sleeve M / F Jacket F >> M