Effect of Length and Inclination of Near Surface Mounted (NSM) Carbon Fiber Reinforced Polymer(CFRP) Strips on the Shear Strengthening of Reinforced Concrete Beams

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Nyilvántartási szám: 
18/03
Témavezető neve: 
Témavezető e-mail címe:
balazs.gyorgy@epito.bme.hu
A témavezető teljes publikációs listája az MTMT-ben:
A téma rövid leírása, a kidolgozandó feladat részletezése: 

Most advanced solution for strengthening of reinforced concrete structures is provided by applying high strength fibre reinforced polymers (FRPs). Two different methods are developed: 

1) One of them is called Externally Bonded Reinforcement (EBR) which includes bonding of FRP strips or meshes to the surface of the member.

2) In the other case first a cut is prepared perpendicularly to the surface of the element until the first layer of reinforcement and the FRP reinforcement is glued into this cut. This is called Near Surface Mounted reinforcement (abbreviated: NSM Reinforcement).

The NSM strengthening method has a couple of advantages compared to the EBR method especially because the FRP reinforcement becomes bonded on its both sides. In this way peeling-off type failure can be avoided, therefore, the ultimate capacity of strengthening is higher.

Design and application of NSM strengthening needs further research in order to provide enough safety.

Present research will include:

(i) an experimental part with studies of parameters like length and inclination of NSM reinforcement

(ii) a modelling part with analytical and numerical studies in order to be able to describe the behaviour of strengthened elements as well as support the design process.



Application of NSM reinforcement is especially reasonable for shear strengthening of deep beams, e.g. bridge girders.

A téma meghatározó irodalma: 

fib: „Design and use of externally bonded FRP reinforcement for concrete structures”, fib Bulletin 14, 2001, Lausanne

A téma hazai és nemzetközi folyóiratai: 
ASCE  Journal of Composites fo Construction
fib Bulletins
Structural Concrete Journal
Key Engineering Materials
Magazin of Concrete Research
Construction and Building Materials Journal
Concrete Structures
A témavezető fenti folyóiratokban megjelent 5 közleménye: 
Bilotta, A., Ceroni, F., Joaquim A. O. Barros, J.A.O., Costa, I., Palmieri, A., Szabó, K.Zs., Nigro, E., Matthys, S., Balázs, G. L., Pecce, M.: “Bond of NSM FRP-Strengthened Concrete: Round Robin Test Initiative” ASCE Journal of Composites for Construction, June 2015, DOI: 10.1061/(ASCE)CC.1943-5614.0000579, Q1: 1.957, IF: 2.48
Balázs, G. L., “Detailing rules”, Chaper 7 of fib Bulletin 14 „Externally bonded FRP reinforcement for concrete structures”, 2001, Lausanne. pp. 85-91.
Walraven, J., Balázs, G. L., “fib Model Code for Concrete Structures 2010: a landmark in an ongoing development”, Structural Concrete Journal Vol. 14, March 2013, pp. 1-2., E&S Wiley ISSN 1751-7648,  DOI: 10.1002/suco.201390005, Q2 0.746, IF 0.857
Balázs, G. L.: “Material and Structural Properties for Creating High Performance Concrete Structures”, Key Engineering Materials Journal Vols. 629-630 (2015) pp 21-27 Online available since 2014/Oct/01 at www.scietific.net Trans Tech Publications, Switzerland, Doi: 10.4028/www.scientific.net/KEM.629-630.21 IF: 0.190 (for 2014), Available in Kudos by Trans Tech Publications
Lublóy, É., Balázs, G.L., Kapitány, K., Barsi, Á., „CT analysis of core samples from fire-damaged concrete structures”, J. Magazine of Concrete Research, http://dx.doi.org/10.1680/jmacr.16.00490, IF 1.277, DOI 10.1680/jmacr.16.00490
 
Megjegyzés: 
Balázs, G. L., Czoboly, O., Lublóy, É., Kapitány, K., Barsi, Á., „Observation of steel fibres in concrete with Computed Tomography”, J Construction and Building Materials, Recieved: 22 Oct 2016, Receieved in revised form: 30 Jan 2017, Accepted: 22 Febr 2017, Available online: 6 March 2017, pp. 534-541, http://dx.doi.org/10.1016/j.conbuildmat.2017.02.114, IF: 2.421, SCImago Q1
Balázs, G. L., Czoboly, O., Lublóy, É., Kapitány, K., Barsi, Á., „Observation of steel fibres in concrete with Computed Tomography”, J. Construction and Building Materials, Recivede: 22 Oct 2016, Receieved in revised form: 30 Jan 2017, Accepted: 22 Febr 2017, Available online: 6 March 2017, pp. 534-541, http://dx.doi.org/10.1016/j.conbuildmat.2017.02.114, IF 2.421, SCImago Q1
Czoboly, O., Balázs G. L., “Are fibres sensitive for mixing?”, Structural Concrete Journal, Vol 18, 2017/1, pp. 19-28. DOI 10.1002suco.201600039, Received: 27 February 2016, Revised: 4 May 2016, Accepted: 4 June 2016, ISSN1464-4177, IF 1.424
Balázs, G. L., et al. “Design for SLS according to fib Model Code 2010”, Structural Concrete J., Vol. 14, June 2013, pp. 99-123. E&S Wiley ISSN 1751-7648, DOI: 10.1002/suco.201200042; Q2 0.746, IF 0.857, http://onlinelibrary.wiley.com/doi/10.1002/suco.201200060/pdf
Balázs, G. L., Lublóy, É., “Post heating strength of fibre-reinforced concretes”, Fire Safety Journal 49, pp. 100-106. (2012) DOI: 10.1016/j.firesaf.2012.01.002, Q1: 1.021, IF 1.222
 

A témavezető eddigi doktoranduszai

Czoboly Olivér Attila (2014/2016/2017)
Schaul Péter (2016//)
Sólyom Sándor (2015/2018/2021)
Balogh Tamás (2010//)
Mezei Sándor (2008//)
Fehérvári Sándor (2006/2009/2009)
Alimrani Naser (2017/2020/2021)
Státusz: 
elfogadott