Non-linear behaviour of insufficiently grouted post-tensioned concrete members
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The purpose of this master thesis is to investigate the structural effects of insufficiently grouted post-tensioned concrete members. This was carried out by performing non-linear analyses in the Finite element analysis program DIANA 10. Reported experiments on four-point bending tests on concrete beams were recreated by performing non-linear analyses and were used to investigate how insufficient grouting can be modelled in DIANA. By using a concept called "bond-slip reinforcements", the user can model the tendon discretely with interface elements. By adjusting the stiffness of these elements, the level of bonding can be defined. A parametric study demonstrated that the choice of stiffnesses had a significant impact on the loss of prestress in the tendon. To proceed, a generic span of a beam bridge was modelled. A new parametric study of the stiffness parameters on the tendon interfaces was performed. Finally, the non-linear behaviour of the bridge was studied. Both the beam model and the bridge model showed that insufficient grouting did not affect the linear behaviour of the member, while the ultimate capacity was slightly lower. The cracking patterns suggest that a grouted concrete member will have more evenly distributed cracks than an ungrouted member.