Pre-stressed FRP for the in-situ strengthening of timber structures

Lehmann, Martin; Properzi, Milena; Pichelin, Frédéric; Triboulot, Pascal (2006). Pre-stressed FRP for the in-situ strengthening of timber structures In: 9th World Conference on Timber Engineering 2006, WCTE 2006. Portland, USA. 06.-10.08.2006.

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Since 1940s, composite materials, formed by the combination of two or more distinct materials in a microscopic scale, have gained more popularity in the engineering field. Fibre Reinforced Polymers (FRP) are a relatively new class of composite materials manufactured from artificial fibres and resins, with demonstrated efficiency in the field of reinforcement and rehabilitation of structures. However, while timber has been successfully reinforced over the past few decades using various materials and reinforcing techniques, only a few of those methods have reached the commercial market. Moreover, compared to the steel, the FRP composites show a different structural behaviour and their utilisation for the in-situ external bonding has not yet been fully explored. In order to gain quantitative and qualitative knowledge on structural adhesive and fibre-reinforced polymer (FRP), suitable for in-situ post-strengthening of timber structures, the authors investigated an application method using pre-stressed carbon fibre strips. In this method the timber beam is cambered prior to the installation of the FRP lamella. This cambering is done with a in the height adjustable prop placed in the middle of the beam. The pre-stress force in the FRP is not constant. It peaks in the middle of the beam were it is mostly needed and is zero towards the ends were high stress would causes delamination. A calculation model was developed and verified. Thus, this paper reports on the latest progress made on the development of the in-situ strengthening of timber beams with pre-stressed carbon fibres.

Item Type:

Conference or Workshop Item (Paper)


School of Architecture, Wood and Civil Engineering
School of Architecture, Wood and Civil Engineering > Institute for Materials and Wood Technology
BFH Centres and strategic thematic fields > BFH Centre for Wood - Resource and Material
School of Architecture, Wood and Civil Engineering > Institut for Building Materials and Biobased Products IBBM


Lehmann, Martin0000-0002-0813-7023;
Properzi, Milena;
Pichelin, Frédéric0000-0003-3856-6707 and
Triboulot, Pascal


Q Science > Q Science (General)
T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)






Sally Haddad

Date Deposited:

13 May 2020 10:00

Last Modified:

23 Sep 2021 02:17

Related URLs:

Uncontrolled Keywords:

Carbon fibres On-site reinforcement Pretension Strain measurements Timber structure




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