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Advances in Materials Science and Engineering
Volume 2016, Article ID 1374689, 12 pages
Research Article

Pull-Out Resistance Capacity of a New Perfobond Shear Connector for Steel Pile Cap Strengthening

1Institute of R&D, Ji Seung Consultant Co., Ltd., Seoul 06128, Republic of Korea
2Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Republic of Korea
3Department of Architectural Engineering, Kyung Hee University, Yongin 17104, Republic of Korea

Received 9 November 2015; Accepted 3 January 2016

Academic Editor: Akihiko Kimura

Copyright © 2016 Young-Ho Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study proposes a new type of the perfobond shear connector, which can be used to strengthen the steel pile cap embedded into the structure foundation, and evaluates its pull-out resistance capacity by performing a test on ten specimens. Test parameters include the embedment length of the shear connector, existence of transverse rebars passing through holes in the shear connector, and their shape, size, and number. The pull-out load versus slip curve is plotted for all specimens, and their failure modes are identified. The effects of the test parameters on the peak pull-out load are examined in this work. The test results show that the perfobond shear connector proposed in this study can retain the peak pull-out load up to 6 times higher than the one without any holes. This indicates that the existence of holes in the shear connector enables the dowel action of concrete inside the hole, resulting in the improvement of the shear resistance capacity of the connector.