Direct evaluation of the local stability of structures using nonlinear FE solutions

Min-Han Oh , Hyo-Jin Kim , Kyungho Yoon , Phill-Seung Lee

Abstract

In this paper, we propose three practical methods for directly evaluating stability in a local structural part of a large structure (local structure). The local stability is assessed by investigating global external load, local internal force, local strain energy, and local displacement, all calculated through nonlinear finite element (FE) analysis. A great advantage of the proposed methods is that they do not require local finite element analysis of the target local part and are applicable to arbitrarily-shaped local parts of a global structure. In addition, unlike previously developed methods, the proposed methods fully consider complicated interactions between local and global structures. The three evaluation methodologies are presented, and their practical effectiveness is demonstrated through several numerical examples.

Key Words

buckling; local stability; nonlinear finite element analysis; resistance capacity; strain energy variation

Address

Min-Han Oh — Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Load and Response Research Department, Hyundai Heavy Industries, 75 Yulgok-ro, Jongno-gu, Seoul 03058, Republic of Korea
Hyo-Jin Kim, Kyungho Yoon — Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Load and Response Research Department, Hyundai Heavy Industries, 75 Yulgok-ro, Jongno-gu, Seoul 03058, Republic of Korea
Phill-Seung Lee — Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea

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