Fatigue of Grouted Joint Connections with High Performance Concrete

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

Damage Model

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

Fatigue of Grouted Joint Connections with High Performance Concrete