This study presents a theoretical solution of elastic critical buckling load of infinitely long pipelines with non-uniform thickness under external pressure. The solution is derived with an assumption that a cylindrical shell under external pressure can be considered as a simple ring. The eigenfunctions are derived to obtain the critical buckling load for a ring structure with two thickness-reduced regeions. The finite element analysis is performed to verify the theoretical solutions.

• 최동호(한양대학교 건설환경공학과 교수, 공학박사) | Choi, Dong Ho
• 고영찬(한양대학교 건설환경공학과 석사과정) | Ko, Young Chan
• 임지훈(한양대학교 건설환경공학과 석사과정) | Lim, Ji Hoon Corresponding Author