Long-Term Deformations of Strengthened Reinforced Concrete Linear Elements

Abstract:

The issue of strengthening the damaged linear reinforced concrete elements have been engaged since 2008. We focused on the analysis of resistance and the characteristics of limit states of serviceability in the damaged and subsequently strengthened elements at a short-term loading. In the introduction phase, the strengthening of the elements was carried out with the following procedures – installation of an overlayer on the coupling board or a combination of the board and use of glass – fiber fabric (GFRP). The strengthening was also affected by the type of contact (reinforced/non-reinforced) – the deformed element/coupling board and its effect on resistance, type of deformation and serviceability. In the non-reinforced contact, we applied some of the types of adjustments to the surface of the strengthened element. At the moment, we are dealing with the effects of time and repeated load on the strengthened elements. The results correspond to the reinforced contact. The values are compared with the short-term results of the strengthened beams and with the long-term results of the beams prepared for strengthening.

• Periodical: Key Engineering Materials (Volume 691)
• Pages: 51-60
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.691.51
• Online since: May 2016
• Authors: Martin Krizma*, Lubomir Bolha
• Keywords: Linear Concrete Elements, Long-Term Loading, Non-Strengthened Beams, Short-Term Loading, Strengthened Beams, Strengthened by Composite Slab, Time Factors

References

[1] Ľ. Bolha, M. Križma, J. Jerga, Influence of Time Factors on Deformations of Reinforced Concrete beams. In: Concrete Days 2000, Bratislava, Slovak Republic, pp.15-21, ISBN 80-227.

[2] M, Križma, M. Baláž, J. Jerga, Ľ. Bolha, Rheological Deformations of Reinforced Concrete Beams. In: Concrete Days 2000, Bratislava, Slovak Republic, pp.21-26, ISBN 80-227.

[3] M. Križma, M. Moravčík, J. Petržala, F. Bahleda, Resistance and Serviceability Characteristics of Strengthened Linear Concrete Elements. In: Engineering Buildings, 06/2013, p.118.

[4] M. Križma, J. Petržala, M. Kovačovic, Resistance between Concrete Surfaces of Composite Members. In: Building Research Journal, 2012, vol. 60, no. 3-4, pp.211-222, (2012 – Emerald Abstracts, Emerald), ISSN 1335-8863.

[5] M. Križma, J. Petržala, M. Moravčík, F. Bahleda, Influence of Contact of Repaired RC Beams and Strengthening Slabs on Failure of Strengthened Elements. In: Proceedings: Testing and  Quality in Building, 7. – 8. 10. 2014, FS VUT, Brno, Czech Republic, p.181.

[6] M. Križma, J. Petržala, M. Moravčík, F. Bahleda, Influence of Type of Strengthening on Limit States of Resistance and Serviceability. In: Proceedings Repair of Concrete Structures, Smolenice 3. –4. 12. 2013, Slovak Republic, p.125.

[7] M. Križma, J. Petržala, M. Kišac, Influence of Type of Contact of RC Beam and Strengthening Slab on Limit States of Strengthened Elements. In: Applied mechanics and materials, 2015, vol. 769, pp.294-301. ISSN 1660-9336.

DOI: 10.4028/www.scientific.net/amm.769.294

[8] STN EN 1992 1-1, Eurocode 2, Design of concrete structures. Part 1-1: General rules and rules for buildings, (2004).

[9] J. Hájek, Š. Hanečka, T. Nürnbergerová, Deflections of Concrete Beams from the Effects of Shear Forces. In: Building Research Journal, 1985, 33, No. 2 , pp.87-114.

[10] J. Hájek, Deformation of Concrete Structures, first ed., VEDA, Bratislava, (1994).

[11] P. Kabele, V. Červenka, J. Červenka, Example Manual. ATENA Engineering, Prague, Czech Republic, (2005).

[12] STN 73 1201, Design of Concrete Structures, Appendix P4, (1986).