Earthquakes and Structures

  • 제5권4호
  • /
  • Pages.477-497
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  • 2013
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  • 2092-7614(pISSN)
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  • 2092-7622(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Pinning retrofit technique in masonry with application of polymer-cement pastes as bonding agents

  • Shrestha, Kshitij C. (Department of Architecture and Architectural Engineering, Graduate School of Engineering, Kyoto University) ;
  • Pareek, Sanjay (Department of Architecture, College of Engineering, Nihon University) ;
  • Suzuki, Yusuke (International Research Institute of Disaster Science, Tohoku University) ;
  • Araki, Yoshikazu (Department of Architecture and Architectural Engineering, Graduate School of Engineering, Kyoto University)
  • 투고 : 2013.04.18
  • 심사 : 2013.07.06
  • 발행 : 2013.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

This paper reports extensive experimental study done to compare workability and bond strength of five different types of polymer-based bonding agents for reinforcing bars in pinning retrofit. In pinning retrofit, steel pins of 6 to 10 mm diameters are inserted into holes drilled diagonally from mortar joints. This technique is superior to other techniques especially in retrofitting historic masonry constructions because it does not change the appearance of constructions. With an ordinary cement paste as bonding agent, it is very difficult to insert reinforcing bars at larger open times due to poor workability and very thin clearance available. Here, open time represents the time interval between the injection of bonding agent and the insertion of reinforcing bars. Use of polymer-cement paste (PCP), as bonding agent, is proposed in this study, with investigation on workability and bond strengths of various PCPs in brick masonry, at open times up to 10 minutes, which is unavoidable in practice. Corresponding nonlinear finite element models are developed to simulate the experimental observations. From the experimental and analytical study, the Styrene-Butadiene Rubber polymer-cement paste (SBR-PCP) with prior pretreatments of drilled holes showed strong bond with minimum strength variation at larger open times.

키워드

참고문헌

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  1. Assessment of out-of-plane behavior of rammed earth walls by pull-down tests pp.1558-3066, 2019, https://doi.org/10.1080/15583058.2018.1433903
  2. In-Plane Shear Resistance between the Rammed Earth Blocks with Simple Interventions: Experimentation and Finite Element Study vol.10, pp.3, 2013, https://doi.org/10.3390/buildings10030057
  3. Ultimate shear strength prediction model for unreinforced masonry retrofitted externally with textile reinforced mortar vol.19, pp.6, 2013, https://doi.org/10.12989/eas.2020.19.6.411