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Nośność na zginanie belek z forniru klejonego warstwowo wzmocnionych taśmami CFRP
Języki publikacji
Abstrakty
The paper presents the results of experimental tests on the reinforcement of bent laminated veneer lumber beams with carbon fibre reinforced polymer (CFRP) strips glued to the bottom of elements. CFRP strips (1.4×43×2800 mm) were glued to the beams by means of epoxy resin. The tests were performed on full-size components with nominal dimensions of 45×200×3400 mm. Static bending tests were performed in a static scheme of the so-called four-point bending. The increase in the load bearing capacity of the reinforced elements (maximum bending moment and loading force) was 38% when compared to reference beams. A similar increase was noted in relation to the deflection of the elements at maximum loading force. For the global stiffness coefficient in bending, the increase for reinforced beams was 21%. There was a change in the way elements were destroyed from brittle, sudden destruction for reference beams resulting from the exhaustion of tensile strength to more ductile destruction initiated in the compressive zone for reinforced beams. The presented method can be applied to existing structures.
W pracy przedstawiono wyniki badań eksperymentalnych dotyczących wzmacniania zginanych belek z forniru klejonego warstwowo za pomocą taśm węglowych (CFRP) przyklejanych do powierzchni dolnej elementów. Taśmy CFRP, o wymiarach 1,4×43×2800 mm, przyklejone zostały za pomocą żywicy epoksydowej. Badania przeprowadzono na elementach pełnowymiarowych o wymiarach nominalnych 45×200×3400 mm. Belki obciążano symetrycznie dwoma siłami skupionymi do zniszczenia. Na podstawie wyników badań stwierdzono: 1. Wzrost nośności - maksymalnej siły obciążającej oraz momentu zginającego w środku rozpiętości - belek wzmocnionych wyniósł 38%. Przyrost przeciętnej wartości modułu sprężystości wyniósł 11%. 2. Obciążanie belek za pomocą dwóch siłowników kontrolowanych za pomocą prędkości ich przesuwu umożliwia dokładniejsze przedstawienie rozkładu sił wewnętrznych w przekroju całego badania oraz kontynuacje zginania w przypadku wystąpienia częściowego zniszczenia w obrębie jednego z siłowników. Sposób prowadzenia obciążenia wpłynął na zróżnicowanie wartości sił w poszczególnych siłownikach w końcowej fazie badania. 3. Przedstawiony sposób wzmocnienia może zostać zastosowany w przypadku konstrukcji istniejących. Taśmy przyklejone zostały pomiędzy punktami podparcia elementów w części przęsłowej belki. 4. Belki referencyjne ulegały zniszczeniu na skutek wyczerpania nośności w strefie rozciąganej. W przypadku belek wzmocnionych inicjacja zniszczenia następowała w strefie ściskanej. Propagacja pęknięcia w dwóch przypadkach wywołała odspojenie taśmy CFRP oraz pękniecie w strefie rozciąganej. Taśmy CFRP pomimo odspojenia nie ulegały zniszczeniu.
Czasopismo
Rocznik
Tom
Strony
139--155
Opis fizyczny
Bibliogr. 39 poz., il., tab.
Twórcy
autor
- Kielce University of Technology, Faculty of Civil Engineering and Architecture, Kielce, Poland
Bibliografia
- [1] A. Borri, M. Corradi, “Strengthening of timber beams with high strength steel cords”, Composites: Part B, vol. 42, no. 6, pp. 1480-1491, 2011. https://doi.org/10.1016/j.compositesb.2011.04.051
- [2] A. Borri, M. Corradi, A. Grazini, “A method for flexural reinforcement of old wood beams with CFRP materials”, Composites: Part B, vol. 36, no. 2, pp. 143-153, 2005. https://doi.org/10.1016/j.compositesb.2004.04.013
- [3] A. D’Ambrisi, F. Focacci, R. Luciano, “Experimental investigation on flexural behavior of timber beams repaired with CFRP plates”, Composite Structures, vol. 108, pp. 720-728, 2014. https://doi.org/10.1016/j.compstruct.2013.10.005
- [4] A. De Jesus, J. Pinto, J. Morais, “Analysis of solid wood beams strengthened with CFRP laminates of distinct lengths”, Construction and Building Materials, vol. 35, pp. 817-828, 2012. https://doi.org/10.1016/j.conbuildmat.2012.04.124
- [5] B. Anshari, Z.W. Guan, A. Kitamori, K. Jung, K. Komatsu, “Structural behaviour of glued laminated timber beams pre-stressed by compressed wood”, Construction and Building Materials, vol. 29, pp. 24-32, 2012. https://doi.org/10.1016/j.conbuildmat.2011.10.002
- [6] E.R. Thorhallsson, G.I. Hinriksson, J.T. Snæbj€ornsson, “Strength and stiffness of glulam beams reinforced with glass and basalt fibres”, Composites: Part B, vol. 115, pp. 300-307, 2016. https://doi.org/10.1016/j.compositesb.2016.09.074
- [7] F.H. Theakston, “A feasibility study for strengthening timber beams with fiberglass”, Canadian agricultural engineering, 1965, pp. 17-19.
- [8] G.M. Raftery, A.M. Harte, “Low-grade glued laminated timber reinforced with FRP plate”, Composites: Part B, vol. 42, no. 4, pp. 724-735, 2011. https://doi.org/10.1016/j.compositesb.2011.01.029
- [9] G.M. Raftery, F. Kelly, “Basalt FRP rods for reinforcement and repair of timber”, Composites: Part B, vol. 70, pp. 9-19, 2015. https://doi.org/10.1016/j.compositesb.2014.10.036
- [10] H. Gezer, B. Aydemir, “The effect of the wrapped carbon fiber reinforced polymer material on fir and pine woods”, Materials and Design, vol. 31, no. 7, pp. 3564-3567, 2010. https://doi.org/10.1016/j.matdes.2010.02.031
- [11] H. Yang, D. Ju, W. Liu, W. Lu, “Prestressed glulam beams reinforced with CFRP bars”, Construction and Building Materials, vol. 109, pp. 73-83, 2016. https://doi.org/10.1016/j.conbuildmat.2016.02.008
- [12] H. Yang, W. Liu, W. Lu, S. Zhu, Q. Geng, “Flexural behavior of FRP and steel reinforced glulam beams, Experimental and theoretical evaluation”, Construction and Building Materials, vol. 106, pp. 550-563, 2016. https://doi.org/10.1016/j.conbuildmat.2015.12.135
- [13] I. Glišović, B. Stevanović, M. Todorović, T. Stevanović, “Glulam beams externally reinforced with CFRP plates”, Wood research, vol. 61, no. 1, pp. 141-154, 2016.
- [14] J.A. Balmori, L.A. Basterra, L. Acuña, “Internal GFRP Reinforcement of Low-Grade Maritime Pine Duo Timber Beams”, Materials, vol. 13, no. 3, 571, 2020. https://doi.org/10.3390/ma13030571
- [15] J. Soriano, B.P. Pellis, N.T. Mascia, “Mechanical performance of glued-laminated timber beams symmetrically reinforced with steel bars”, Composite Structures, vol. 150, pp. 200-207, 2016. https://doi.org/10.1016/j.compstruct.2016.05.016
- [16] K. Andor, A. Lengyel, R. Polgár, T. Fodor, Z. Karácsonyi, “Experimental and statistical analysis of spruce timber beams reinforced with CFRP fabric”, Construction and Building Materials, vol. 99, pp. 200-207, 2015. https://doi.org/10.1016/j.conbuildmat.2015.09.026
- [17] L.A. Basterra, J.A. Balmori, L. Morillas, L. Acuña, M. Casado, “Internal reinforcement of laminated duo beams of low-grade timber with GFRP sheets”, Construction and Building Materials, vol. 154, pp. 914-920, 2017. https://doi.org/10.1016/j.conbuildmat.2017.08.007
- [18] L. Rudziński, “Konstrukcje drewniane. Naprawy, wzmocnienia, przykłady obliczeń”, Skrypt Politechniki Świętokrzyskiej, Kielce, 2010.
- [19] L. Ye, B. Wang, P. Shao, “Experimental and Numerical Analysis of a Reinforced Wood Lap Joint”, Materials, vol. 13, no. 18, 4117, 2020. https://doi.org/10.3390/ma13184117
- [20] M. Bakalarz, P. Kossakowski, “Mechanical Properties of Laminated Veneer Lumber Beams Strengthened with CFRP Sheets”, Archives of Civil Engineering, vol. 65, no. 2, pp. 57-66, 2019. https://doi.org/10.2478/ace-2019-0018
- [21] M. Bakalarz, P. Kossakowski, “The flexural capacity of laminated veneer lumber beams strengthened with AFRP and GFRP sheets”, Technical Transactions, vol. 2, pp. 85-95, 2019. https://doi.org/10.4467/2353737XCT.19.023.10159
- [22] M.M. Bakalarz, P.G. Kossakowski, P. Tworzewski, “Strengthening of Bent LVL Beams with Near-Surface Mounted (NSM) FRP Reinforcement”, Materials, vol. 13, no. 10, pp. 1-12, 2020. https://doi.org/10.3390/ma13102350
- [23] M. Corradi, A. Borri, “Fir and chestnut timber beams reinforced with GFRP pultruded elements”, Composites: Part B, vol. 38, no. 2, pp. 172-181, 2007. https://doi.org/10.1016/j.compositesb.2006.07.003
- [24] M. Dudziak, I. Malujda, K. Talaśka, T. Łodygowski, W. Sumelka, “Analysis of the process of wood plasticization by hot rolling”, Journal of Theoretical and Applied Mechanics, vol. 54, no. 2, pp. 503-516, 2016. https://doi.org/10.15632/jtam-pl.54.2.503
- [25] M. Fossetti, G. Minafò, M. Papia, “Flexural behaviour of glulam timber beams reinforced with FRP cords”, Construction and Building Materials, vol. 95, pp. 54-64, 2015. https://doi.org/10.1016/j.conbuildmat.2015.07.116
- [26] P. De La Rosa, A. Cobo, M.N. González García, “Bending reinforcement of timber beams with composite carbon fiber and basalt fiber materials”, Composites: Part B, vol. 55, pp. 528-536, 2013. https://doi.org/10.1016/j.compositesb.2013.07.016
- [27] P. De La Rosa García, A.C. Escamilla, M.N. González García, “Analysis of the flexural stiffness of timber beams reinforced with carbon and basalt composite materials”, Composites: Part B, vol. 86, pp. 152-159, 2016. https://doi.org/10.1016/j.compositesb.2015.10.003
- [28] P.G. Kossakowski, “Influence of anisotropy on the energy release rate GI for highly orthotropic materials”, Journal of Theoretical and Applied Mechanics, vol. 45, no. 4, pp. 739-752, 2007.
- [29] PN-EN 14374:2005 Timber Structures. Structural Laminated Veneer Lumber (LVL). Requirements, Polish Standards Committee: Warsaw, Poland, 2005.
- [30] PN-EN 1995-1-1:2010 Eurocode 5, Design of timber structures. Part 1-1: General. Common rules and rules for buildings, Polish Standards Committee: Warsaw, Poland, 2010.
- [31] PN-EN 408+A1:2012 Timber Structures. Structural Timber and Glued Laminated Timber. Determination of Some Physical and Mechanical Properties, Polish Standards Committee: Warsaw, Poland, 2012.
- [32] PN-EN 527-1:2012 Plastics. Determination of tensile properties. Part 1: General principles, Polish Standards Committee: Warsaw, Poland, 2013.
- [33] PN-EN 527-5:2010 Plastics. Determination of tensile properties. Part 5: Test conditions for unidirectional fibrereinforced plastic composites, Polish Standards Committee: Warsaw, Poland, 2010.
- [34] T.P. Nowak, J. Jasieńko, D. Czepiżak, “Experimental tests and numerical analysis of historic bent timber elements reinforced with CFRP strips”, Construction and Building Materials, vol. 40, pp. 197-206, 2013. https://doi.org/10.1016/j.conbuildmat.2012.09.106
- [35] V. De Luca, C. Marano, “Prestressed glulam timbers reinforced with steel bars”, Construction and Building Materials, vol. 30, pp. 206-217, 2012. https://doi.org/10.1016/j.conbuildmat.2011.11.016
- [36] Y. Nadir, P. Nagarajan, M. Ameen, M. Arif M, “Flexural stiffness and strength enhancement of horizontally glued laminated wood beams with GFRP and CFRP composite sheets”, Construction and Building Materials, vol. 112, pp. 547-555, 2016. https://doi.org/10.1016/j.conbuildmat.2016.02.133
- [37] Y.-F. Li, M.-J. Tsai, T.-F. Wei, W.-C. Wang, “A study on wood beams strengthened by FRP composite materials”, Construction and Building Materials, vol. 62, pp. 118-125, 2014. https://doi.org/10.1016/j.conbuildmat.2014.03.036
- [38] Y.-F. Li, Y.-M. Xie, M.-J. Tsai, “Enhancement of the flexural performance of retrofitted wood beams using CFRP composite sheets”, Construction and Building Materials, vol. 23, pp. 411-422, 2009. https://doi.org/10.1016/j.conbuildmat.2007.11.005
- [39] Z.W. Guan, P.D. Rodd, D.J. Pope, “Study of glulam beams pre-stressed with pultruded GRP”, Computers and Structures, vol. 83, pp. 2476-2487, 2005. https://doi.org/10.1016/j.compstruc.2005.03.021
Uwagi
Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-0cbcac0a-9971-4ca0-8286-3a3970826492