The present document adds to the series of documents recently issued by the CNR on the structural use of fibre-reinforced polymer (FRP) composites, started with the publication of CNR-DT 200/2004. The topic of the present document is the use of externally bonded systems for strengthening timber structures. This is an informative document. The intended objectives of this document are to disseminate, within the professional community, the current knowledge on the use of FRPs for strengthening of timber structures, and to provide the necessary information to identify cases where the use of FRPs for strengthening applications is appropriate and safe. It is well-known that the current state of the art on this topic is not as advanced as that on concrete and masonry structures. Accordingly, no international guidelines on the use of FRPs for strengthening of timber structures are available at present. In this context, the present document represents the first step towards the development of specific design guidelines. These guidelines will be issued in the near future, once the theoretical and experimental studies currently underway internationally, will produce a more complete and consolidated understanding of the subject. This document will then be useful to identify any still unsolved problems , therefore allowing the scientific community to focus on them over the next years, and will become a reference document on this topic. The current version of this document contains some basic concepts on FRP strengthening and on related specific problems, on strengthening of structural members under combined bending and axial force, with particular reference to strengthening of wooden floors and their stiffening under inplane loads. Some qualitative aspects of debonding issues and of strengthening of joints are also addressed. Finally, three Appendices are included, which present several examples of FRP strengthening interventions on structures (Appendix A), the main technical references (Appendix B) and the design code references on the subject (Appendix C).
Technical Document CNR-DT 201/2005, Guidelines for the Design and Construction of Externally Bonded FRP Systems for Strengthening Existing Structures - Timber structures. Preliminary study
ASCIONE, Luigi;BERARDI, Valentino Paolo;FEO, Luciano
2007-01-01
Abstract
The present document adds to the series of documents recently issued by the CNR on the structural use of fibre-reinforced polymer (FRP) composites, started with the publication of CNR-DT 200/2004. The topic of the present document is the use of externally bonded systems for strengthening timber structures. This is an informative document. The intended objectives of this document are to disseminate, within the professional community, the current knowledge on the use of FRPs for strengthening of timber structures, and to provide the necessary information to identify cases where the use of FRPs for strengthening applications is appropriate and safe. It is well-known that the current state of the art on this topic is not as advanced as that on concrete and masonry structures. Accordingly, no international guidelines on the use of FRPs for strengthening of timber structures are available at present. In this context, the present document represents the first step towards the development of specific design guidelines. These guidelines will be issued in the near future, once the theoretical and experimental studies currently underway internationally, will produce a more complete and consolidated understanding of the subject. This document will then be useful to identify any still unsolved problems , therefore allowing the scientific community to focus on them over the next years, and will become a reference document on this topic. The current version of this document contains some basic concepts on FRP strengthening and on related specific problems, on strengthening of structural members under combined bending and axial force, with particular reference to strengthening of wooden floors and their stiffening under inplane loads. Some qualitative aspects of debonding issues and of strengthening of joints are also addressed. Finally, three Appendices are included, which present several examples of FRP strengthening interventions on structures (Appendix A), the main technical references (Appendix B) and the design code references on the subject (Appendix C).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
