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SETSCI - Volume 3 (2018)
ISAS2018-Winter - 2nd International Symposium on Innovative Approaches in Scientific Studies, Samsun, Turkey, Nov 30, 2018

Behavior of CLT Formwork Beams Retrofitting with CFRP Strip under Static Loading (ISAS2018-Winter_52)
Abdullah Türer1*, Taki Ünal Dönmez2, Abdülkadir Çevik3, Özgür Anıl4
1Gaziantep University, Gaziantep, Turkey
2Gazi University, Ankara, Turkey
3Gaziantep University, Gaziantep, Turkey
4Gazi University, Ankara, Turkey
* Corresponding author: aturer@ybu.edu.tr
Published Date: 2019-01-14   |   Page (s): 277-281   |    20     5

ABSTRACT Timber structures are used as building elements in ancient times due to the lightness and durability. Formwork
material of reinforced concrete structures are also made of wood. Although timber is widely used in industry, it has been
limited research in literature. Timber formwork beams can be deformed quickly because they are used repeatedly. In this study,
an experimental investigation on damaged timber formwork beams retrofitting with carbon fiber reinforced polymer (CFRP)
strips and CFRP fan type anchors is performed. The experiment carried out with 2 timber formwork beam without damage and
2 timber formwork beams with damage up to 85 percent of ultimate capacity. The damaged timber beams were tested to
evaluate the effectiveness of CFRP materials for flexural retrofitting. The experimental results show that the application of
CFRP strip is effective for retrofitting damaged beams. As a result, it was observed that the ultimate load carrying capacity of
85% damaged beams was almost completely restored to its original performance level.  
KEYWORDS Timber Formwork Beams, CFRP, Retrofitting, Static Loading, Flexural Strength
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[2] M. Khelifa and A. Celzard, “Numerical analysis of flexural strengthening of timber beams reinforced with CFRP strips,” Compos. Struct., vol. 111, no.
1, pp. 393–400, 2014.
[3] M. Subhani, A. Globa, R. Al-Ameri, and J. Moloney, “Flexural strengthening of LVL beam using CFRP,” Constr. Build. Mater., vol. 150, pp. 480–489, 2017.
[4] M. Uzel, A. Togay, Ö. Anil, and C. Söğütlü, “Experimental investigation of flexural behavior of glulam beams reinforced with different bonding
surface materials,” Constr. Build. Mater., vol. 158, pp. 149–163, 2018.
[5] A. D’Ambrisi, F. Focacci, and R. Luciano, “Experimental investigation on flexural behavior of timber beams repaired with CFRP plates,” Compos. Struct., vol. 108, no. 1, pp. 720–728, 2014.
[6] Y. J. Kim and K. A. Harries, “Modeling of timber beams strengthened with various CFRP composites,” Eng. Struct., vol. 32, no. 10, pp. 3225–3234, 2010.
[7] Doka, “Timber formwork beams,” 2013.

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