Ultimate limit state of MF-FRP beams

F. Nardone, G. P. Lignola, A. Prota, G. Manfredi, A. Nanni

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Usually, FRP materials are adhesively bonded to the structural substrate. An innovative technique application is based on the use of mechanical fastening (MF-FRP) by means of steel anchors to attach FRP laminates with enhanced bearing strength to concrete substrate. The benefit of MF-FRP, compared to adhesive bonding for FRP flexural strengthening is due to speed of installation using unskilled labor, minimal or absent surface preparation under any meteorological condition and immediate use of the strengthened structures. Some of the potential shortcomings are: brittle failure modes for members strengthened with the MF-FRP without a proper design; possible concrete damage during the drilling and dense internal reinforcement of the members that could limit the installation. Laboratory testing and a number of field applications have shown the effectiveness of such method. In this paper an analytical model is discussed for reinforced concrete (RC) beams strengthened by using MF-FRP strips. The model accounts for equilibrium, compatibility and constitutive relationships of materials, in particular, it accounts explicitly for the slip between the surface of the substrate and the FRP strip due to the behavior of fasteners. The proposed flexural model, coupled with an appropriate computation algorithm, is able to predict the fundamentals of flexural behavior of RC members strengthened with MF-FRP strips in terms of ultimate limit state. A comparison between the analytical predictions and the experimental results has been performed to validate the proposed model. The comparison shows a good agreement between the analytical predictions and the experimental results.

Original languageEnglish (US)
Title of host publicationBridge Maintenance, Safety, Management, Resilience and Sustainability - Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management
Pages1235-1242
Number of pages8
StatePublished - Jul 23 2012
Event6th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2012 - Stresa, Lake Maggiore, Italy
Duration: Jul 8 2012Jul 12 2012

Publication series

NameBridge Maintenance, Safety, Management, Resilience and Sustainability - Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management

Other

Other6th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2012
CountryItaly
CityStresa, Lake Maggiore
Period7/8/127/12/12

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ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Safety, Risk, Reliability and Quality

Cite this

Nardone, F., Lignola, G. P., Prota, A., Manfredi, G., & Nanni, A. (2012). Ultimate limit state of MF-FRP beams. In Bridge Maintenance, Safety, Management, Resilience and Sustainability - Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management (pp. 1235-1242). (Bridge Maintenance, Safety, Management, Resilience and Sustainability - Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management).