• Title/Summary/Keyword: 주열식 벽체

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A Study on Estimation of End Bearing Capacity of a PHC-W Pile in Building Underground Additional Wall Using the PHC-W Earth Retaining Wall (PHC-W 흙막이 벽체를 이용한 건축물 지하증설벽체에서 PHC-W말뚝의 선단지지력 산정에 관한 연구)

  • Kim, Chea Min;Yun, Daehee;Lee, Chang Uk;Johannes, Jeanette Odelia;Kim, Sung Su;Choi, Yongkyu
    • Journal of the Korean Geotechnical Society
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    • v.35 no.3
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    • pp.5-16
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    • 2019
  • With the recent concentration of urban populations, the constructions of large structures are increasing, along with the development of foundations for large structures. PHC Piles have been used in many structures ever since Japanese introduced the technology at the end of the 20th century. Recently, many studies on the use of the PHC Pile have been carried out as earth retaining using the merits of PHC piles. In this study, static axial compression tests were conducted on the PHC-W piles constructed as column-type in building underground additional wall using the PHC-W earth retaining wall. The end bearing capacity of pile was calculated using the axial load transfer measurement that was obtained from the static axial compression test result. Since end bearing capacity of the PHC-W pile embedded in weathered rock showed a different behaviour from the conventional PHC pile, the calculation method of end bearing capacity for column-type PHC-W piles would be proposed. The unit ultimate end bearing equation proposed for single and group PHC-W pile embedded in weathered rock is $q_b=13.3N_b$ and $q_b=6.8N_b$.

The Effect of Composite Ratio and Wall Thickness on the Shear Behavior of Composite Basement Wall (합성율과 벽체두께가 합성지하벽의 전단거동에 미치는 영향)

  • Seo, Soo-Yeon;Kim, Seong-Soo;Yoon, Yong-Dae
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.1
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    • pp.93-101
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    • 2010
  • When doing underground excavation works for the purpose of constructing large underground structures for a building in the limited space in downtown area, the stability of the adjacent ground must be top priority, and to accomplish this, it is essential to review the retaining wall construction carefully. H-Pile, which has been mainly used as a stress-carrying material in temporary earth-retaining structures, is most likely to be abandoned after completion of the works for the basement exterior wall in relation to contiguous bored piles, so it will result in a waste of material. To improve this situation, Basement Composite Wall where H-Pile and basement wall are compounded, has been developed. This wall is being used most frequently in many local construction sites. In this study, five specimens are made in order to evaluate the shear resistance of the basement composite wall and tested. Test parameter is the composition ratio and wall thickness according to shear connectors. Test result shows that the shear strength is improved when the composite ratio is increased but the magnitude is not much. A formula, which considers the contribution of concrete, web of H-pile as well as flange' effect in calculation of shear strength of composite basement wall, is suggested and used to calculation of the strength of specimens. It is found that there is a good co-relation between test result and the calculated one by the formula.