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http://dx.doi.org/10.12652/Ksce.2016.36.6.0999

Prestressing Effect of LNG Storage Tank with 2,400 MPa High-Strength Strands  

Jeon, Se-Jin (Ajou University)
Seo, Hae-Keun (DM Engineering)
Yang, Jun-Mo (POSCO)
Youn, Seok-Goo (Seoul National University of Science and Technology)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.36, no.6, 2016 , pp. 999-1010 More about this Journal
Abstract
High-strength strands have been increasingly applied to recent actual structures in Korea. Structural effect of the increased spacing of sheaths was investigated in this study when the usual 1,860 MPa strands of an LNG storage tank are replaced with 2,400 MPa high-strength strands. First, finite element models of a cylindrical wall of an LNG tank were established and prestressing effect of the circumferential and vertical tendons was considered as equivalent loads. As a result of varying the tendon spacing and prestressing force with the total prestressing effect kept the same, the stress distribution required in design was obtained with the high-strength strands. Also, a full-scale specimen that corresponds to a part of an LNG tank wall was fabricated with 31 high-strength strands with 15.2 mm diameter inserted in each of two sheaths. It was observed that such a high level of prestressing force can be properly transferred to concrete. Moreover, an LNG tank with the world's largest 270,000 kl capacity was modeled and the prestressing effect of high-strength strands was compared with that of normal strands. The watertightness specifications such as residual compressive stress and residual compression zone were also ensured in case of leakage accident. The results of this study can be effectively used when the 2,400 MPa high-strength strands are applied to actual LNG tanks.
Keywords
2,400 MPa; High-strength strand; LNG storage tank; Prestressing tendon; Prestressed concrete;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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