DOI QR코드

DOI QR Code

In-plane seismic performance of masonry wall retrofitted with prestressed steel-bar truss

  • Hwang, Seung-Hyeon (Department of Architectural Engineering, Kyonggi University) ;
  • Kim, Sanghee (Department of Architectural Engineering, Kyonggi University) ;
  • Yang, Keun-Hyeok (Department of Architectural Engineering, Kyonggi University)
  • 투고 : 2020.09.14
  • 심사 : 2020.12.01
  • 발행 : 2020.12.25

초록

An external prestressed steel-bar truss unit was developed as a new strengthening technology to enhance the seismic performance of an in-plane masonry wall structure while taking advantage of the benefits of a prestressed system. The presented method consists of six steel bars: two prestressed vertical bars to introduce a prestressing force on the masonry wall, two diagonal bars to resist shear deformation, and two horizontal bars to maintain the configuration. To evaluate the effects of this new technique, four full-scale specimens, including a control specimen, were tested under combined loadings that included constant-gravity axial loads and cyclic lateral loads. The experimental results were analyzed in terms of the shear strength, initial stiffness, dissipated energy, and strain history. The efficiency of the external prestressed steel-bar truss unit was validated. In particular, a retrofitted specimen with an axial load level of 0.024 exhibited a more stable post behavior and higher energy dissipation than a control specimen with an observed complete sliding failure. The four vertical bars of the adjacent retrofitting units created a virtual column, and their strain values did not change until they reached the peak shear strength. The shear capacity of the masonry wall structure with external prestressed steel-bar truss units could be predicted using the model suggested by Yang et al.

키워드

과제정보

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (No. 2015R1A5A1037548) and by the Korea Agency for Infrastructure Technology Advancement funded by the Ministry of Land, Infrastructure and Transport of the Korean government (No. 20TMIPC158687-01)

참고문헌

  1. Anthoine, A., Magonette, G. and Magenes, G. (1995), "Shearcompression testing and analysis of brick masonry walls", Proceedings of the 10th European Conference on Earthquake Engineering, Vienna, Austria, August.
  2. Artar, M., Coban, K., Yurdakul, M., Canb, O., Yilmaz, F. and Yildiz, M.B. (2019), "Investigation on seismic isolation retrofit of a historical masonry structure", Earthq. Struct., 16(4), 501-512. http://dx.doi.org/10.12989/eas.2019.16.4.501
  3. ASTM C1314 (2018), Standard test method for compressive strength of masonry prisms, American Society for Testing and Materials; Philadelphia.
  4. ASTM C39/C39M (2020), Standard test method for compressive strength of cylindrical concrete specimens, American Society for Testing and Materials, Philadelphia.
  5. ASTM E519/E519M (2015), Standard test method for diagonal tension (shear) in masonry assemblages, American Society for Testing and Materials, Philadelphia.
  6. ASTM E8/E8M (2016), Standard test methods for tension testing of metallic materials, American Society for Testing and Materials, Philadelphia.
  7. Bhattacharya, S., Nayak S. and Dutta, S.C. (2014), "A critical review of retrofitting methods for unreinforced masonry structures", Int. J. Disaster Risk Reduct., 7, 51-67. https://doi.org/10.1016/j.ijdrr.2013.12.004
  8. Capozucca, R. (2011), "Experimental analysis of historic masonry walls reinforced by CFRP under in-plane cyclic loading", Compos. Struct., 94(1), 277-289. https://doi.org/10.1016/j.compstruct.2011.06.007
  9. Darbhanzi, A., Marefat, M.S. and Khanmohammadi, M. (2014), "Investigation of in-plane seismic retrofit of unreinforced masonry walls by means of vertical steel ties", Constr. Build. Mater., 52, 122-129. https://doi.org/10.1016/j.conbuildmat.2013.11.020.
  10. FEMA 306 (1999), Evaluation of earthquake damaged concrete and masonry wall buildings, Federal Emergency Management Agency; Washington, D.C.
  11. Gattesco, N., Boem, I. and Dudine, A. (2014), "Diagonal compression tests on masonry walls strengthened with a GFRP mesh reinforced mortar coating", Bul. Earthq. Eng., 13, 1703-1726. https://doi.org/10.1007/s10518-014-9684-z.
  12. Lee, J.H. (2005), "Seismic capacity and seismic retrofitting of low-rise buildings unreinforced masonry brick-infilled RC frame and steel slit damper retrofitted RC frame", Ph.D. Dissertation, Kwangwoon University of Korea, Republic of Korea.
  13. NCMA (2012), Post-tensioned concrete masonry wall design, National Concrete Masonry Association
  14. NEHRP (1997), Recommended provisions for seismic regulations for new buildings and other structures: Part-1 - provisions. Building Seismic Safety Council, Washington D.C.
  15. Popa, V., Pascu, R., Papurcu, A. and Albota, E. (2016) "Retrofitting of squat masonry walls by FRP grids bonded by cement-based mortar", Earthq. Struct., 10(1), 125-139. http://dx.doi.org/10.12989/eas.2016.10.1.125.
  16. Preciado, A., Ramirez-Gaytan, A., Gutierrez, N., Vargas, D., Falcon, J.M. and Ochoa, G. (2018), "Nonlinear earthquake capacity of slender old masonry structures prestressed with steel, FRP and NiTi SMA tendons", Steel Compos. Struct., 26(2), 213-226. http://dx.doi.org/10.12989/scs.2018.26.2.213.
  17. Rinaldin, G., Amadio, C. and Gattesco N. (2017), "Review of experimental cyclic tests on unreinforced and strengthened masonry spandrels and numerical modelling of their cyclic behavior", Eng. Struct., 132, 609-623. https://doi.org/10.1016/j.engstruct.2016.11.063.
  18. Rinaldin, G., Miniussi, C. and Amadio, C. (2019), "Cyclic behavior of masonry walls strengthened by tie rods", Eng. Struct., 184, 287-300. https://doi.org/10.1016/j.engstruct.2019.01.103.
  19. Taghdi, M., Bruneau, M. and Saatcioglu, M. (2000), "Seismic retrofitting of low-rise masonry and concrete walls using steel strips", J. Struct. Eng., 126(9), 1017-1025. https://doi.org/10.1061/(ASCE)0733-9445(2000)126:9(1017).
  20. Turnsek, V. and Cacovic, F. (1971), "Some experimental results on the strength of brick masonry walls", The 2nd International Brick and Block Masonry Conference, 149-156.
  21. Van der Meer, L.J, Martens D.R.W. and Vermeltfoort, A.T. (2009), "Introduction to post-tensioned shear walls of calcium silicate element masonry", Proceedings of 11th Canadian Masonry Symposium, 1-10.
  22. Yang, K.H., Joo, D.B., Sim, J.I. and Kang, J.H. (2012), "In-plane seismic performance of unreinforced masonry walls strengthened with unbonded prestressed wire rope units", Eng. Struct., 45, 449-459. https://doi.org/10.1016/j.engstruct.2012.06.017.
  23. Yang, K.H., Mun, J.H. and Hwang, S.H. (2020), "Cyclic shear behavior of masonry walls strengthened with prestressed steel bars and glass fiber grids", Compos. Struct., 238, 1-12. https://doi.org/10.1016/j.compstruct.2020.111961.