Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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An Experimental Study for Reinforcement Effect of Adhesive Stiffeners Depending on the Aspect Ratio of Masonry Wall

조적벽체의 형상비에 따른 접착형 보강재의 보강효과에 관한 실험적 연구

  • 박병태 (서울시립대학교 건축공학과) ;
  • 권기혁 (서울시립대학교 건축공학과)
  • Received : 2016.09.26
  • Accepted : 2017.06.15
  • Published : 2017.07.01
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Abstract

Unreinforced masonry buildings are vulnerable to lateral forces, such as earthquakes, owing to the nature of the building materials, yet numerous masonry buildings remain in South Korea. Since the majority of the existing masonry buildings were constructed more than 20 years ago, it is necessary to develop economical reinforcement methods for disaster reduction. In this study, external reinforcement of masonry walls using adhesive stiffeners was proposed as a reinforcement method for such age-old masonry buildings. Six specimens were fabricated with different aspect ratios (L/H = 1.0, 1.3, and 2.0) and used in static load tests to verify the reinforcement effect. The experimental results showed that the masonry walls before and after reinforcement were ruptured by rigid body rotation and slip. In addition, the maximum strength, maximum displacement, and dissipated energy of the walls were shown to increase after applying the adhesive stiffeners, thereby verifying the excellent reinforcement effect. Furthermore, an adhesive stiffener design for unreinforced masonry walls was proposed based on the increased shear strength achieved by using conventional glass fibers. The proposed design can be used as a basis for the application of adhesive stiffeners for unreinforced masonry walls.

비보강 조적조 건축물은 재료의 특성상 지진과 같은 횡력에 취약하지만, 국내에는 여전히 많은 조적조 건물이 존재한다. 특히 현재 남아있는 조적조 건축물의 대부분이 20년 이상 노후화됨에 따라 재해감소를 위한 경제성 있는 보강법의 개발이 요구된다. 본 논문에서는 이러한 노후 된 조적조 건축물의 보강법의 하나로 접착형 보강재를 활용한 조적벽체의 외부 보강법을 제시하였으며, 보강효과 검증을 위해 총 6개의 실험체를 형상비(L/H=1.0, 1.3, 2.0)를 변수로 제작하여 정적가력실험을 실시하였다. 실험결과, 보강전 후 조적벽체는 강체회전 및 미끄러짐에 의해 파괴가 발생하였고, 접착형 보강재 부착후 벽체의 최대내력, 최대변위, 소산에너지량은 증가하여 우수한 보강효과를 확인하였다. 또한 기존 유리섬유를 활용한 증가된 전단강도식에 착안하여 비보강 조적벽체에 대한 접착형 보강재의 설계안을 도출하여 적용을 위한 기초자료를 제공하였다.

Keywords

References

  1. Borri, A., Castori, G., and Corradi, M. (2011), Shear Behavior of Masonry Panels Strengthened by High Strength Steel Cords, Construction and Building Materials, 25, 494-503. https://doi.org/10.1016/j.conbuildmat.2010.05.014
  2. Ahn, C. W., Yoon, J. H., Song, D. Y., Chan, B. S., and Min, C. H. (2012), The Design Considerations of Steel Braced Frame for Seismic Retrofit Through Increasing the Lateral Strength of Existing RC Buildings, Earthquake Engineering Society of Korea, 17(6), 293-303.
  3. ARYA, A. S., BOEN, T., and ISHIYAMA, Y. (2013), Guidelines for earthquake resistant non-engineered construction, United Nations Educational, Scientific and Cultural Organization, 75-81.
  4. B. Luccioni, V. C. Rougier (2011), In-plane Retrofitting of Masonry Panels with Fibre Reinforced Composite Materials, Construction and Building Materials, 25, 1772-1788. https://doi.org/10.1016/j.conbuildmat.2010.11.088
  5. Bae, B. I., Yun, H. J., Choi, C. S. and Choi, H. K. (2012), Evaluation of Shear Strength of Unreinforced Masonry Walls Retrofitted by Fiber Reinforced Polymer Sheet, Journal of the Korea Concrete Institute, 24(3), 305-313. https://doi.org/10.4334/JKCI.2012.24.3.305
  6. Bibiana L. and Viviana C. Rougier (2011), In-plane retrofitting of masonry panels with fibre reinforced composite materials, 25, 1772-1788. https://doi.org/10.1016/j.conbuildmat.2010.11.088
  7. Catherine, P., Thanasis, T., and Maria, L. (2011), Externally Bonded Grids as Strengthening and Seismic Retrofitting Materials of Masonry Panels, Construction and Building Materials, 25, 504-514. https://doi.org/10.1016/j.conbuildmat.2010.07.018
  8. Zhou, D., Zhou, S., and Lei, Z. (2016), In-Plane Shear Behaviors of Constrained Masonry Walls Externally Retrofitted with BFRP, Journal of Composites for Construction, 20(2), 1-12.
  9. ElGawady, M., Lestuzzi, P., and Badoux, M. (2004). A Review of Conventional Seismic Retrofitting Techniques for URM. In: proceedings of 13th international brick and block masonry conference. Amsterdam, July, Paper No. 89.
  10. International Association for Earthquake Engineering (2004), Guidelines for earthquake resistant non-engineered construction, National Information Center of Earthquake Engineering, 34-39.
  11. Ismail, N., Petersen, R. B., Masia, M. J., and Ingham, J. M. (2011), Diagonal Shear Behaviour of Unreinforced Masonry Wallettes Strengthened Using Twisted Steel Bars, Construction and Building Materials, 25(12), 4386-4393. https://doi.org/10.1016/j.conbuildmat.2011.04.063
  12. Kashyap, J., Willis, C. R., Griffith, M. C., Ingham, J. M., and Masia, M. J. (2012), Debonding Resistance of FRP-to-clay Brick Masonry Joints, Engineering Structures, 41, 186-195. https://doi.org/10.1016/j.engstruct.2012.03.032
  13. Korea Infrastructure Safety and Technology Corporation (2011), Assessment guideline for seismic performance of existing building, 63-66.
  14. Kwon, K. H., Lee, S. C. and Jung, W. C. (2007), Proposing the Shear Force Equation of GFRP Strengthened Masonry Wall, Journal of Korean Society of Hazard Mitigation, 7(1), 1-9.
  15. Kwon, K. H., Choi, S. M., Lee, S. C. and Cho, S. M. (2004), Seismic Capacity Strengthened by GFS of Masonry Buildings with Earthquake Damage, Journal of the Korea Institute for Structural Maintenance and Inspection, 8(1), 231-237.
  16. Lee, J. H., Kim, K. M., Kim, H. W., Kim, J. S., Oh, S. H., and Lee, S. H. (2014), Seismic Retrofitting Effects of Retrofitted Unreinforced Masonry Walls Using Metal Laths and Steel Plates, Journal of Korean Society of Hazard Mitigation, 14(3), 63-70. https://doi.org/10.9798/KOSHAM.2014.14.3.63
  17. ElGawady, M. A. Lestuzzi, P., and Badoux, M. (2006), Aseismic Retrofitting of Unreinforced Masonry Walls Using FRP, Composites Part B: Engineering, 37, 148-162.
  18. National Disaster Management Institute (2009), Study on seismic retrofitting techniques for unreinforced masonry buildings, 25-38.
  19. Olivito, R. S., Dubois, F., Venneri, A., and Zuccarello, F. A. (2012), Experimental and Numerical Analysis of Masonry Macro Elements Reinforced by Natural-Fibre-Composite Materials, 6th International Conference on FRP Composites in Civil Engineering, Rome, Italy, pp. 1-8.
  20. Paola, M., and Kimiro, M. (2004), Proposal of effective technique for retrofitting unreinforced masonry dwelling, 13th World conference on earthquake engineering vancouver, Canada, Paper No. 2431.
  21. Park, B. T., and Kwon, K. H. (2015), An Experimental Study on Strength and Ductility of Masonry Buildings Retrofitted by Metal Connectors, Journal of the Korea Institute for Structural Maintenance and Inspection, 19(3), 113-121. https://doi.org/10.11112/jksmi.2015.19.3.113
  22. Rosamaria, C. (2014), Mechanical performance of natural fiber reinforced composites for the strengthening of ancient masonry, University of calabria.
  23. Song, C. U. (2013), An Improvement Scheme on the Execution System of Seismic Retrofit School Projects, Master Thesis, Department of Construction Management, Chung-Ang University, Seoul, Korea, 6-7.