000016022 001__ 16022
000016022 005__ 20161115135336.0
000016022 04107 $$aeng
000016022 046__ $$k2013-06-12
000016022 100__ $$aStefanou, G.
000016022 24500 $$aBuckling Analysis of Steel Tubes With Random Geometric Imperfections

000016022 24630 $$n34.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000016022 260__ $$bNational Technical University of Athens, 2013
000016022 506__ $$arestricted
000016022 520__ $$2eng$$aThe stability analysis of relatively thick steel tubes under external pressure is important, e.g. for the design and construction of offshore pipeline members. The buckling behavior of this type of structures in presence of random imperfections has been studied very scarcely in the literature, in contrast to the case of thin cylindrical shells [1]. In the present paper, the effect of initial (out-ofplane) random geometric imperfections on the buckling load of steel tubes under axial load and lateral pressure is investigated. The geometric imperfections are modeled as a 2D-1V non-homogeneous Gaussian stochastic field simulated using the spectral representation method [2]. The evolutionary power spectrum of the non-homogeneous field is derived from available experimental measurements using the method of separation [3]. For the determination of the limit load variability of the tubes, a stochastic finite element formulation based on Monte Carlo simulation is implemented. It is shown that this variability can be in some cases substantial. A comparison with the results obtained from linearized buckling analyses of tubes with imperfections having the form of the first eigenmode indicates that a realistic description of the imperfections through stochastic fields leads to more conservative results (smaller buckling loads) and thus is preferable.

000016022 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000016022 653__ $$a

000016022 7112_ $$aCOMPDYN 2013 - 4th International Thematic Conference$$cIsland of Kos (GR)$$d2013-06-12 / 2013-06-14$$gCOMPDYN2013
000016022 720__ $$aStefanou, G.$$iVryzidis, I.$$iPapadopoulos, V.
000016022 8560_ $$ffischerc@itam.cas.cz
000016022 8564_ $$s39172$$uhttps://invenio.itam.cas.cz/record/16022/files/2126.pdf$$yOriginal version of the author's contribution as presented on CD, section: SC-MS 22 THE MULTISCALE STOCHASTIC FINITE ELEMENT METHOD
.
000016022 962__ $$r15525
000016022 980__ $$aPAPER