Department of Architecture and Civil Engineering

Anchorage zones for FRP-prestressed concrete

At a glance

Funding body: EPSRC, £76,000
Principal investigator: Tim Ibell
Researcher: Man Cho Choi and Luke Gale
Industry partners: Parsons Brinckerhoff, Highways Agency
Dates: 2005 - 2008


Fibre-reinforced polymer (FRP) materials have many advantages over the use of steel to prestress concrete structures. However, in order to ensure that a fully non-metallic structure results, it is crucial that the anchorage zones of such structures are reinforced against bursting using FRP materials too.

This project studied both the primary and the secondary zone problems. The primary zone issue is related to local bursting behind each individual anchor, while the interaction amongst many primary zones leads to larger secondary zone issues.

By carrying out dozens of tests, and by applying plasticity theory to this problem, it was able to be shown that FRP can be used effectively to reinforce anchorage zones in a ductile way.