1. Home
  2. Vol 8, No 1 (2022)
  3. Jang

Out-of-Plane Strengthening of Unreinforced Masonry Walls by Glass Fiber-Reinforced Polyurea

Hye-Sook Jang, Jae-Hyoung An, Jun-Hyeok Song, Seung-Hwan Son, Yu-Sik Hong, Hee-Chang Eun

Abstract


Fiber-reinforced polymer reinforcement or polyurea reinforcement techniques are applied to strengthen unreinforced masonry walls (UMWs). The purpose of this experimental study is to verify the out-of-plane reinforcing effect of sprayed glass fiber-reinforced polyurea (GFRPU), which is a composite elastomer made of polyurea and milled glass fibers on UMW. The out-of-plane strengths and ductile behaviors based on various coating shapes are compared in this study. An empirical formula to describe the degree of reinforcement on the out-of-plane strength of the UMW is derived based on the experimental results. It is observed that the peak load-carrying capacity, ductility, and energy absorption capacity gradually improve with an increase in the strengthening degree or area. Compared with the existing masonry wall reinforcement method, the GFRPU technique is a construction method that can help improve the safety performance along with ease of construction and economic efficiency.

 

Doi: 10.28991/CEJ-2022-08-01-011

Full Text: PDF


Keywords


Glass Fiber-Reinforced Poloyurea; Out-of-Plane Reinforcement; Strengthening; Ductility; Energy Absorption Capacity; Unreinforced Masonry Wall.

References


Darbhanzi, A., Marefat, M. S., & Khanmohammadi, M. (2014). Investigation of in-plane seismic retrofit of unreinforced masonry walls by means of vertical steel ties. Construction and Building Materials, 52, 122–129. doi:10.1016/j.conbuildmat.2013.11.020.

Lantz, L., Maynez, J., Cook, W., & Wilson, C. M. D. (2016). Blast Protection of Unreinforced Masonry Walls: A State-of-the-Art Review. Advances in Civil Engineering, 2016. doi:10.1155/2016/8958429.

Myers, J. J., & Tanizawa, Y. (2010). In-plane behavior of an alternative masonry retrofitted with polyurea membranes. Structural Faults and Repair (SF&R 2010), Edinburgh, Scotland, UK.

Hrynyk, T. D., & Myers, J. J. (2008). Out-of-Plane Behavior of URM Arching Walls with Modern Blast Retrofits: Experimental Results and Analytical Model. Journal of Structural Engineering, 134(10), 1589–1597. doi:10.1061/(asce)0733-9445(2008)134:10(1589).

Galati, N. (2003). “Out-of-plane behavior of masonry walls strengthened with FRP materials.” PhD. Dissertation. Univ. of Lecce, Lecce, Italy.

Salem, S., Ezzeldin, M., El-Dakhakhni, W., & Tait, M. (2019). Out-of-Plane Behavior of Load-Bearing Reinforced Masonry Shear Walls. Journal of Structural Engineering, 145(11), 04019127. doi:10.1061/(asce)st.1943-541x.0002403.

Türkmen, S., Wijte, S. N. M., De Vries, B. T., & Ingham, J. M. (2021). Out-of-plane behavior of clay brick masonry walls retrofitted with flexible deep mounted CFRP strips. Engineering Structures, 228. doi:10.1016/j.engstruct.2020.111448.

Meriggi, P., de Felice, G., & De Santis, S. (2020). Design of the out-of-plane strengthening of masonry walls with fabric reinforced cementitious matrix composites. Construction and Building Materials, 240. doi:10.1016/j.conbuildmat.2019.117946.

Corradi, M., Speranzini, E., & Bisciotti, G. (2020). Out-of-plane reinforcement of masonry walls using joint-embedded steel cables. Bulletin of Earthquake Engineering, 18(10), 4755–4782. doi:10.1007/s10518-020-00875-3.

Guerreiro, J., Ferreira, J. G., Proença, J., & Gago, A. (2018). Strengthening of Old Masonry Walls for out-of-Plane Seismic Loading with a CFRP Reinforced Render. Experimental Techniques, 42(4), 355–369. doi:10.1007/s40799-018-0239-0.

Connell, J. D. (2002). Evaluation of elastomeric polymers for retrofit of unreinforced masonry walls subjected to blast PhD. Dissertation. University of Alabama at Birmingham, United States.

Broekaert, M. (2002). Polyurea spray coatings: The technology and latest developments. Paint and Coatings Industry, 18(10), 80–93.

Myers, J. J. (2006). Out of Plane Behavior of Masonry Infill Walls Retrofitted With a Reinforced Polymer Grid and Polyurea ... Conference: Proceedings for the Structural Faults & Repair (2006, February 2015.

Carey, N. L., & Myers, J. J. (2011). Discrete fiber reinforced polymer systems for repair of concrete structures: Polyurea-fiber characterization results. In American Concrete Institute, ACI Special Publication. Vol. 1, Issue 275 SP, 275–288.

Carey, N. L., & Myers, J. J. (2010). Full scale blast testing of hybrid barrier systems. In American Concrete Institute, ACI Special Publication. Issue 281 SP, 152–170). American Concrete Institute.

Greene, C. E. (2010). Compressive behavior of concrete cylinders strengthened with a discrete fiber reinforced polymer system. Doctoral dissertation, MS thesis, Missouri Univ. of Science and Technology, Rolla, MO, United States.

Greene, C. E., & Myers, J. J. (2013). Flexural and Shear Behavior of Reinforced Concrete Members Strengthened with a Discrete Fiber-Reinforced Polyurea System. Journal of Composites for Construction, 17(1), 108–116. doi:10.1061/(asce)cc.1943-5614.0000308.

Galati, N., Garbin, E., Tumialan, G., & Nanni, A. (2005). Design guidelines for masonry structures: Out of plane loads. American Concrete Institute, ACI Special Publication, SP-230, 269–288.

Wu, G., Ji, C., Wang, X., Gao, F., Zhao, C., Liu, Y., & Yang, G. (2021). Blast response of clay brick masonry unit walls unreinforced and reinforced with polyurea elastomer. Defence Technology, 11. doi:10.1016/j.dt.2021.03.004.

Song, J. H., Lee, E. T., & Eun, H. C. (2019). A Study on the Improvement of Structural Performance by Glass Fiber-Reinforced Polyurea (GFRPU) Reinforcement. Advances in Civil Engineering, 2019. doi:10.1155/2019/2818219.

Song, J. H., Lee, E. T., & Eun, H. C. (2020). Shear strength of reinforced concrete columns retrofitted by glass fiber reinforced polyurea. Civil Engineering Journal (Iran), 6(10), 1852–1863. doi:10.28991/cej-2020-03091587.

Song, J. H., Lee, E. T., Eun, H. C., & Apostolopoulos, C. (2020). A Study on the Strengthening Performance of Concrete Beam by Fiber-Reinforced Polyurea (FRPU) Reinforcement. Advances in Civil Engineering, 2020. doi:10.1155/2020/6967845.

Song, J. H., & Eun, H. C. (2021). Improvement of flexural and shear strength of RC beam reinforced by glass fiber-reinforced polyurea (GFRPU). Civil Engineering Journal (Iran), 7(3), 407–418. doi:10.28991/cej-2021-03091662.

Son, S. H. (2021). A study on in-plane strengthening effect of masonry wall by composite material of milled glass fiber and polyurea. PhD Thesis, Kangwon National University, Korea.

Korea Facilities Safety Corporation. (2019). Seismic performance evaluation guidelines for existing facilities. Buildings, Korea.


Full Text: PDF

DOI: 10.28991/CEJ-2022-08-01-011

Refbacks

  • There are currently no refbacks.


Bookmark and Share


Copyright (c) 2022 Hee-Chang Eun, Hye-Sook Jang, Jae-Hyoung An, Jun-Hyeok Song, Yu-Sik Hong, Seung-Hwan Son

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
x
Message