Steel and Composite Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Investigation of damaged formwork timber beam retrofitting with anchoraged CFRP strip under different loading

  • Abdullah TURER (Civil Eng. Dept., Ankara Yildirim Beyazit University) ;
  • Ozgur ANIL (Civil Eng. Dept., Gazi University) ;
  • Abdulkadir CEVIK (Civil Eng. Dept., Gaziantep University) ;
  • R. Tugrul Erdem (Civil Eng. Dept., Manisa Celal Bayar University)
  • Received : 2022.05.10
  • Accepted : 2024.03.05
  • Published : 2024.03.25
⟨ Previous Next ⟩

Abstract

Construction of high-rise structures, formwork systems that can be installed quickly, resistant to external loads, can be used more than once, have become a necessity. Timber and composite timber materials are preferred in the formation of such formwork systems due to their durability, ease of assembly, light weight and easy to use more than one time. Formwork beams are the most commonly used structural component in the formation of such formwork systems, and these beams can be damaged for different reasons during their lifetime. In this study, H20 top P type timber formwork beams with 1800 and 2450 mm length which is among the products of DOKA(c) company is damaged under the effect of static loading up to a high load level of 85% of the maximum ultimate capacity and after being retrofitted using anchored CFRP strips, performance and behavior of the beams under the influence of various loading types such as static, fatigue and impact are investigated experimentally. Two different lengths of retrofitted timber formwork beams were tested by applying monotonic static, fatigue and impact loading and comments were made about the effects of the retrofit method on performance under different loading types.

Keywords

References

  1. ABAQUS (2015), User's Manual, Version 6.12, SIMULIA, Dassault Systemes Simulia Corp. 
  2. American Concrete Institute, ACI 440.2R-17, (2017), Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures. 
  3. Anshari, B, Guan, Z.W., Kitamori, A., Jung, K. and Komatsu, K., (2012), "Structural behaviour of glued laminated timber beams pre-stressed by compressed wood", Constr. Build. Mater., 29, 24-32. https://doi.org/10.1016/j.conbuildmat.2011.10.002. 
  4. Anshari, B., Guan, Z.W. and Wangc, Q.Y. (2017), "Modelling of glulam beams pre-stressed by compressed wood", Compos. Struct., 165(2017) 160-170. https://doi.org/10.1016/j.compstruct.2017.01.028. 
  5. Dietsch, P. and Tannert, T. (2015), "Assessing the integrity of glued-laminated timber elements", Construct. Build. Mater., 101, 1259-1270. https://doi.org/10.1016/j.conbuildmat.2015.06.064. 
  6. Fossetti, M., Minafo, G. and Papia, M. (2015), "Flexural behaviour of glulam timber beams reinforced with FRP cords", Construct. Build. Mater., 95, 54-64. https://doi.org/10.1016/j.conbuildmat.2015.07.116. 
  7. Haiman, M., Pavkovic, K. and Baljkas, B. (2010), Application of Glulam Beam Girders With External Pre-Stressing, WTCE, World Conference on Timber Engineering.
  8. Hurd, M.K. (2005), Formwork for Concrete. Vol. 1. United States of America, Michigan American Concrete Institute. 
  9. Karke, S.M. and Kumathekar, M.B. (2014), Comparison of the Use of Traditional and Modern Formwork Systems, in Civil Engineering Systems and Sustainable Innovations, Excellent Publishing House New Delhi, India. 348-351. 
  10. Lumber, S.C. (2021), Wood-Based Composite Materials. 
  11. Naik, M.B. and Rathod, H.A. (2015), "A review on innovating formwork systems", Int. J. Adv. Res. Eng. Sci. Manage., 1(6), 8. 
  12. Nemati, K.M. (2007), Temporary Structures: Formwork for Concrete, in Construction Management. University of Washington: USA. 36. 
  13. Poon, C.S. and Yip, R. (2005), "Comparison of the use of traditional and low waste formwork systems in Hong Kong", In The 2005 World Sustainable Building Conference, Tokyo:SB05Tokyo, 2741-2748. 
  14. Raftery, G.M. and Harte, A.M. (2013), "Nonlinear numerical modelling of FRP reinforced glued laminated timber", Compos. Part B, 52, 40-50. https://doi.org/10.1016/j.compositesb.2013.03.038. 
  15. Raftery, G.M. and Rodd, P.D. (2015), "FRP reinforcement of low-grade glulam timber bonded with wood adhesive", Construct. Build. Mater., 91, 116-125. https://doi.org/10.1016/j.conbuildmat.2015.05.026. 
  16. Sena-Cruz, J., Jorge, M., Branco, J.M. and Cunha, V.M.C.F. (2013), "Bond between glulam and NSM CFRP laminates", Construct. Build. Mater., 40, 260-269. https://doi.org/10.1016/j.conbuildmat.2012.09.089. 
  17. Shen, L.Y., Jorge Ochoa, J., Shah, M.N. and Zhang, X. (2011), "The application of urban sustainability indicators - A comparison between various practices", Habitat Int., 35(1), 17-29. https://doi.org/10.1016/j.habitatint.2010.03.006. 
  18. Stalnaker, J. and Harris, E. (1997), Structural Design in Wood, Springer Science & Business Media. 
  19. Thelandersson, S. and Larsen, H.J. (2003), Timber Engineering. John Wiley & Sons. 
  20. Tran, V.D., Oudjene, M. and Meausoone, P.J. (2015), "Experimental and numerical analyses of the structural response of adhesively reconstituted beech timber beams", Compos. Struct., 119, 206-217. https://doi.org/10.1016/j.compstruct.2014.08.013. 
  21. Vahedian, A., Shrestha, R. and Cews, K. (2019), "Experimental and analytical investigation on CFRP strengthened glulam laminated timber beams: Full-scale experiments", Compos. Part B: Eng., 164, 377-389. https://doi.org/10.1016/j.compositesb.2018.12.007. 
  22. Weidong, L., Ling, Z., Geng, Q., Liu, W., Yang, H. and Yue, K. (2015), "Study on flexural behaviour of glulam beams reinforced by Near Surface Mounted (NSM) CFRP laminates", Construct. Build. Mater., 91, 23-31.  https://doi.org/10.1016/j.conbuildmat.2015.04.050
  23. Yang, H., Ju, D., Liu, W. and Lu, W. (2016b), "Prestressed glulam beams reinforced with CFRP bars", Construct. Build. Mater., 109, 73-83. https://doi.org/10.1016/j.conbuildmat.2016.02.008. 
  24. Yang, H., Liu, W. and Ren, X. (2016a), "A component method for moment-resistant glulam beam-column connections with glued-in steel rods", Eng. Struct., 115, 42-54. https://doi.org/10.1016/j.engstruct.2016.02.024.