Buckling Response of Pipe-in-Pipe Systems Subjected to Bending  

作　　者：王哲 陈志华 刘红波 何永禹 马克俭 

机构地区：[1]School of Civil Engineering, Tianjin University [2]Key Laboratory of Coast Civil Structure Safety, Ministry of Education(Tianjin University) [3]Research Center of Spatial Structures, Guizhou University

出　　处：《Transactions of Tianjin University》2015年第6期492-500,共9页天津大学学报（英文版）

基　　金：Supported by the National Basic Research Program of China("973" Program,No.2014CB046801)

摘　　要：The buckling response of pipe-in-pipe(PIP)systems subjected to bending is investigated in this paper. A set of parameterized models are established to explore the bending characteristics of the PIP systems through eigenvalue buckling analysis and nonlinear post-buckling analysis. The results show that the length of PIP systems and the height of centralizers are the most significant factors that influence the buckling moment, ultimate bending moment and buckling mode; the other geometric characteristics, such as initial geometric imperfection and friction between centralizers and outer pipes, evidently influence the post-buckling path and ductility of PIPs; the equivalent bending stiffness is dependent on the length and centralizers. Moreover, the range of equivalent bending stiffness is also discussed.The buckling response of pipe-in-pipe（PIP）systems subjected to bending is investigated in this paper. A set of parameterized models are established to explore the bending characteristics of the PIP systems through eigenvalue buckling analysis and nonlinear post-buckling analysis. The results show that the length of PIP systems and the height of centralizers are the most significant factors that influence the buckling moment, ultimate bending moment and buckling mode; the other geometric characteristics, such as initial geometric imperfection and friction between centralizers and outer pipes, evidently influence the post-buckling path and ductility of PIPs; the equivalent bending stiffness is dependent on the length and centralizers. Moreover, the range of equivalent bending stiffness is also discussed.

关 键 词：pipe-in-pipe bending buckling bending stiffness finite element 

分 类 号：O344.1[理学—固体力学]