| Title |
Prestressing Effect of LNG Storage Tank with 2,400 MPa High-Strength Strands |
| Authors |
전세진(Jeon, Se-Jin) ; 서해근(Seo, Hae-Keun) ; 양준모(Yang, Jun-Mo) ; 윤석구(Youn, Seok-Goo) |
| DOI |
https://doi.org/10.12652/Ksce.2016.36.6.0999 |
| Keywords |
고강도 강연선;LNG 저장탱크;프리스트레싱 텐던;프리스트레스트 콘크리트 2,400 MPa;High-strength strand;LNG storage tank;Prestressing tendon;Prestressed concrete |
| 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. |