天津大学学报（英文版）
天津大學學報（英文版）
천진대학학보（영문판）
Transactions of Tianjin University
2015年
6期
492-500
,共9页
王哲%陈志华%刘红波%何永禹%马克俭
王哲%陳誌華%劉紅波%何永禹%馬剋儉
왕철%진지화%류홍파%하영우%마극검
pipe-in-pipe%bending%buckling%bending stiffness%finite element
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 eigen-value 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 mo-ment 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.
