Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
권호 표지
DOI QR코드

DOI QR Code

Evaluation of Bending Creep Performance of Laminated Veneer Lumber (LVL) Formwork for the Design of Timber Concrete Composite (TCC) Structures

  • Received : 2024.03.04
  • Accepted : 2024.06.18
  • Published : 2024.07.25
Download PDF
⟨ Previous Next ⟩

Abstract

The study focuses on evaluating the bending creep performance of laminated veneer lumber (LVL) formwork in timber concrete composite (TCC) structures. Timber-framed construction is highlighted for its environmental benefits and seismic resistance, but limitations such as poor tensile strength and brittle failure in bending hinder its use in high-rise buildings. Wood-concrete hybrid structures, particularly those using reinforced concrete slabs with TCC floors, emerge as a potential solution. The research aims to understand the time-dependent behavior of TCC components, considering factors like wood and concrete shrinkage and connection creep. The experiment was conducted in western Japan on the TCC floor designed for use in the Kama-city Inatsuki-higashi compulsory education school. The LVL formwork, measuring 9,000 mm by 900 mm, and concrete is loaded onto it for testing. The creep test periods are examined using concrete loading. It employs a comprehensive creep analysis, adhering to Japanese standards, involving deflection measurements and regression analysis to estimate the creep coefficient. Results indicate substantial deformation after shoring removal, suggesting potential reinforcement needs. The study recommends extending test periods for improved accuracy and recognizing regional climate impacts. Overall, the research provides valuable insights into the potential of LVL formwork in TCC structures, emphasizing safety considerations and paving the way for further experimentation under varied conditions to validate structural integrity.

Keywords

References

  1. Cao, J., Xiong, H., Chen, J. 2021. Mechanical performance of timber-concrete bolted connections under cyclic loading. Structures 34: 3464-3477. https://doi.org/10.1016/j.istruc.2021.09.086
  2. Cao, J., Xiong, H., Wang, J., Kang, J. 2020. Model updating for timber-framed construction using the full-scale test. Engineering Structures 213: 110560.
  3. Chiniforush, A.A., Valipour, H.R., Ataei, A. 2021. Timber-timber composite (TTC) connections and beams: An experimental and numerical study. Construction and Building Materials 303: 124493.
  4. Choi, G.W., Yang, S.M., Lee, H.J., Kim, J.H., Choi, K.H., Kang, S.G. 2020. A study on the block shear strength according to the layer composition of and adhesive type of ply-lam CLT. Journal of the Korean Wood Science and Technology 48(6): 791-806. https://doi.org/10.5658/WOOD.2020.48.6.791
  5. Choi, G.W., Yang, S.M., Lee, H.J., Kim, J.H., Choi, K.H., Kang, S.G. 2021. Evaluation of flexural performance according to the plywood bonding method of ply-lam CLT. Journal of the Korean Wood Science and Technology 49(2): 107-121. https://doi.org/10.5658/WOOD.2021.49.2.107
  6. Fragiacomo, M., Lukaszewska, E. 2013. Time-dependent behaviour of timber-concrete composite floors with prefabricated concrete slabs. Engineering Structures 52: 687-696. https://doi.org/10.1016/j.engstruct.2013.03.031
  7. Fujimoto, Y., Tanaka, H., Morita, H., Kang, S.G. 2021. Development of ply-lam composed of Japanese cypress laminae and Korean larch plywood. Journal of the Korean Wood Science and Technology 49(1): 57-66. https://doi.org/10.5658/WOOD.2021.49.1.57
  8. Ha, Y.S., Lee, H.J., Lee, S.J., Shin, J.A., Song, D.B. 2023. A study on floor impact sound insulation performance of cross-laminated timber (CLT): Focused on joint types, species and thicknesses. Journal of the Korean Wood Science and Technology 51(5): 419-430. https://doi.org/10.5658/WOOD.2023.51.5.419
  9. Hammad, M.W., Valipour, H.R., Foster, S.J. 2024. Timber-concrete composites (TCC) floors subjected to hogging moment. Engineering Structures 303: 117488.
  10. Hashemi, A., Yousef-Beik, S.M.M., Zarnani, P., Quenneville, P. 2021. Seismic strengthening of conventional timber structures using resilient braces. Structures 32: 1619-1633. https://doi.org/10.1016/j.istruc.2021.03.100
  11. Hwang, S.W., Chung, H., Lee, T., Ahn, K.S., Pang, S.J., Bang, J., Kwak, H.W., Oh, J.K., Yeo, H. 2022. Monitoring of moisture and dimensional behaviors of nail-laminated timber (NLT)-concrete slab exposed to outdoor air. Journal of the Korean Wood Science and Technology 50(5): 301-314. https://doi.org/10.5658/WOOD.2022.50.5.301
  12. Izzi, M., Casagrande, D., Bezzi, S., Pasca, D., Follesa, M., Tomasi, R. 2018. Seismic behaviour of crosslaminated timber structures: A state-of-the-art review. Engineering Structures 170: 42-52. https://doi.org/10.1016/j.engstruct.2018.05.060
  13. Khorsandnia, N., Schanzlin, J., Valipour, H., Crews, K. 2014. Time-dependent behaviour of timber-concrete composite members: Numerical verification, sensitivity and influence of material properties. Construction and Building Materials 66: 192-208. https://doi.org/10.1016/j.conbuildmat.2014.05.079
  14. Kim, H.B., Kim, S.J., Oh, J.K., Park, J.S., Lee, J.J. 2012. Influence of air-tightness on heat energy performance in post and beam building with exposed wood frame. Journal of the Korean Wood Science and Technology 40(5): 319-326. https://doi.org/10.5658/WOOD.2012.40.5.326
  15. Kim, H.B., Park, J.S., Hong, J.P., Oh, J.K., Lee, J.J. 2014. Air tightness performance of residential timber frame buildings. Journal of the Korean Wood Science and Technology 42(2): 89-100. https://doi.org/10.5658/WOOD.2014.42.2.89
  16. Kreis, B., Kubler, W., Frangi, A. 2023. Development and investigation of an innovative, light-weight, two-way spanning timber-concrete composite slab. Engineering Structures 286: 116087.
  17. Ministry of Land, Infrastructure, Transport and Tourism. 2016. The building standard law of Japan (May 2016): Notification No. 1433 of the Ministry of Construction / May 31, 2000. https://www.bcj.or.jp/publication/html/bcj_upload/product_file/17_01_2016BSL掲載告示一覧(E)_修正.pdf
  18. Oh, S. 2022. Experimental study of bending and bearing strength of parallel strand lumber (PSL) from Japanese larch veneer strand. Journal of the Korean Wood Science and Technology 50(4): 237-245. https://doi.org/10.5658/WOOD.2022.50.4.237
  19. Schanzlin, J., Fragiacomo, M. 2018. Analytical derivation of the effective creep coefficients for timber-concrete composite structures. Engineering Structures 172: 432-439. https://doi.org/10.1016/j.engstruct.2018.05.056
  20. Song, D.B., Kim, K.H. 2023. Influence of composition of layer layout on bending and compression strength performance of larix cross-laminated timber (CLT). Journal of the Korean Wood Science and Technology 51(4): 239-252. https://doi.org/10.5658/WOOD.2023.51.4.239
  21. Yang, S.M., Lee, H.H., Kang, S.G. 2021. Research trends in hybrid cross-laminated timber (CLT) to enhance the rolling shear strength of CLT. Journal of the Korean Wood Science and Technology 49(4): 336-359. https://doi.org/10.5658/WOOD.2021.49.4.336