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

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
권호 표지
DOI QR코드

DOI QR Code

Experimental Evaluation of Pullout Strength of Long-Rawlplug Screw Anchor according to the Compressive Strength of Concrete and Embedded Length

콘크리트 압축강도 및 매입깊이에 따른 긴 칼블럭앵커의 뽑힘강도 평가

  • 박준렬 (경기대학교 스마트시티공학부) ;
  • 양근혁 (경기대학교 스마트시티공학부) ;
  • 김상희 (경기대학교 스마트시티공학부) ;
  • 오나경 (경기대학교 일반대학원 건축공학과)
  • Received : 2021.10.12
  • Accepted : 2021.12.09
  • Published : 2021.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

In 2017, the Gyeongju earthquake caused many casualties and considerable property damage by overturning and dropping blocks and bricks. Various reinforcement techniques were proposed, but some problems, such as short length or difficult construction, were encountered. Therefore, this study proposes a long-rawlplug screw anchor to improve the existing rawlplug anchor and conducts an experiment to evaluate the pullout strength. Variables in the pullout test were the compressive strength of concrete and the embedded length of the long-rawlplug screw anchor. According to the results, the pullout strength of the long-rawlplug screw anchor increased as the compressive strength of concrete increased, and they were not affected by the embedded length. Rather, it was found that the screw length of the long-rawlplug was important to the pullout strength.

2017년 경주지진은 블록이나 벽돌의 전도 및 탈락을 발생시켜 많은 인명피해 및 재산피해를 야기했다. 이에 칼블럭앵커나 치장벽 보강 나선앵커를 활용한 보강기법들이 제시되었지만 길이가 짧거나 시공오차에 대한 대응의 어려움 등 문제가 발생하였다. 따라서 본 연구는 기존의 칼블럭앵커을 개선한 긴 칼블럭앵커를 제안하고 뽑힘강도 평가 실험을 수행하였다. 실험 변수는 콘크리트 압축강도와 매입깊이로 설정하였다. 앵커 인발시험결과, 긴 칼블럭앵커의 뽑힘강도는 콘크리트 실험체의 압축강도가 증가함에 따라 증가하였으며, 긴 칼블럭앵커의 매입깊이는 큰 영향이 없었다. 오히려 나사산 길이가 뽑힘강도에 더 큰 영향이 있는 것으로 나타났다.

Keywords

Acknowledgement

본 연구 2021년 정부(행정안전부)의 재원으로 국립재난안전연구원의 재난안전 기술사업화(과제번호: No. 2021- MOIS32-042-01010100-2021)의 연구비 지원에 의해 수행되었습니다. 이에 감사드립니다.

References

  1. Kim, T. J. (2017), Pohang Earthquake and Seismic Design and Construction, Journal of the Korea Institute of Building Construction, 17(4), 14-17.
  2. Yoon, B. (2018). Nonstructural Elements Resulting From Pohang Earthquake and Direction of Future Seismic Design Nonstructural Elements, Journal of Architectural Institute of Korea, 62(4), 23-28. (in Korean)
  3. KDS 14 20 54 (2016), Standard for Durability Design of Concrete Structures, Korea Concrete Institute, Korea.
  4. Hur, M. W., Chae, K. H., An, Y. S., and Park, T. W. (2019), An Performance Evaluation of Post-installed Anchor according to the Effective Embedment Length, Journal of the Korean Institute of Educational Facilities, 26(4), 19-25. (in Korean) https://doi.org/10.7859/KIEF.2019.26.4.019
  5. Al-Sabah, S., Alam Sourav, S. N., and McNally, C. (2021), The Post-installed Screw Pull-out Test: Development of a Method for Assessing In-situ Concrete Compressive Strength, Journal of Building Engineering, 33, 101658 https://doi.org/10.1016/j.jobe.2020.101658
  6. Lorenzo, M., and Patrick, F. (2014, July), Bond Strength of Anchor Pins for Earth Block Masonry, In Proceeding of the 9th International Conference on International Masonry Society.
  7. Moreira, S., Ramos, L. F., Csikai, B., and Bastos, P. (2014), Bond Behaviour of Twisted Stainless Steel Bars in Mortar Joints, In Proceeding of the 9th International Conference on International Masonry Society.
  8. Jia. P., Hu. L., Feng. G., Bo. C., Zhou. J., Zhang. M., and Zhou. Y. (2017), Design and Synthesis of a Castor Oil Based Plasticizer Containing THEIC and Diethyl Phosphate Groups for the Preparation of Flame-retardant PVC Materials, Journal of the Royal Society of Chemistry, 7, 897-903.