The Experts below are selected from a list of 228369 Experts worldwide ranked by ideXlab platform
Manolis Papadrakakis - One of the best experts on this subject based on the ideXlab platform.
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Buckling analysis of imperfect I-Section Beam-columns with stochastic shell finite elements
Computational Mechanics, 2010Co-Authors: Dominik Schillinger, Vissarion Papadopoulos, Manfred Bischoff, Manolis PapadrakakisAbstract:Buckling loads of thin-walled I-Section Beam-columns exhibit a wide stochastic scattering due to the uncertainty of imperfections. The present paper proposes a finite element based methodology for the stochastic buckling simulation of I-Sections, which uses random fields to accurately describe the fluctuating size and spatial correlation of imperfections. The stochastic buckling behaviour is evaluated by crude Monte-Carlo simulation, based on a large number of I-Section samples, which are generated by spectral representation and subsequently analyzed by non-linear shell finite elements. The application to an example I-Section Beam-column demonstrates that the simulated buckling response is in good agreement with experiments and follows key concepts of imperfection triggered buckling. The derivation of the buckling load variability and the stochastic interaction curve for combined compression and major axis bending as well as stochastic sensitivity studies for thickness and geometric imperfections illustrate potential benefits of the proposed methodology in buckling related research and applications.
Gardner L - One of the best experts on this subject based on the ideXlab platform.
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Fire testing of austenitic stainless steel I-Section Beam–columns
'Elsevier BV', 2021Co-Authors: Xing Z, Zhao O, Kucukler M, Gardner LAbstract:With the increasing use of stainless steel elements in construction, the need for comprehensive rules to enable their efficient structural design is clear. To date, the fire behaviour of stainless steel I-Section Beam–columns has been the subject of relatively little research. In particular, there is an absence of experimental data. To address this gap in knowledge, full-scale anisothermal fire tests on six grade 1.4301 austenitic stainless steel I-Section Beam–columns have been carried out; the test procedure and results are reported herein. The test specimens were subjected to eccentric axial compression with two eccentricity values so as to achieve different combinations of axial compression and uniform minor axis bending. Complementary initial local and global geometric imperfection measurements, room temperature tensile coupon tests and room temperature Beam–column tests were also carried out. Based on the obtained experimental results, together with additional numerical results from a previous study, the existing design rules in the European structural steel fire design standard EN 1993-1-2 and the new design method of Kucukler et al. (2021) for stainless steel Beam–columns in fire, which will be incorporated into the next version of EN 1993-1-2, are assessed
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Laser-welded stainless steel I-Section Beam-columns: Testing, simulation and design
'Elsevier BV', 2018Co-Authors: Bu Y, Gardner LAbstract:The stability and design of laser-welded stainless steel I-Section Beam-columns are explored in this study. Owing to the high precision and low heat input of laser-welding, structural cross-sections produced using this fabrication method have smaller heat affected zones, lower thermal distortions and lower residual stresses than would typically arise from traditional welding processes. Eighteen laser-welded stainless steel Beam-columns were tested to investigate the member buckling behaviour under combined compression and bending. Two I-Section sizes were considered in the tests: I-50 × 50 × 4 × 4 in grade EN 1.4301 and I-102 × 68 × 5 × 5 in grade EN 1.4571 austenitic stainless steel. The two cases of minor axis bending plus compression and major axis bending plus compression with lateral restraints were investigated. The initial loading eccentricities in the Beam-column tests were varied to provide a wide range of bending moment-to-axial load ratios. The test results obtained herein and from a previous experimental study were used to validate finite element (FE) models, which were subsequently employed for parametric investigations to generate further structural performance data over a wider range of cross-section sizes, member lengths and loading combinations. The obtained test and FE results were utilized to evaluate the accuracy of the Beam-column capacity predictions according to the current European and North American design provisions and a recent proposal by Greiner and Kettler. Finally, an improved approach for the design of stainless steel I-Section Beam-columns is proposed
Dominik Schillinger - One of the best experts on this subject based on the ideXlab platform.
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Buckling analysis of imperfect I-Section Beam-columns with stochastic shell finite elements
Computational Mechanics, 2010Co-Authors: Dominik Schillinger, Vissarion Papadopoulos, Manfred Bischoff, Manolis PapadrakakisAbstract:Buckling loads of thin-walled I-Section Beam-columns exhibit a wide stochastic scattering due to the uncertainty of imperfections. The present paper proposes a finite element based methodology for the stochastic buckling simulation of I-Sections, which uses random fields to accurately describe the fluctuating size and spatial correlation of imperfections. The stochastic buckling behaviour is evaluated by crude Monte-Carlo simulation, based on a large number of I-Section samples, which are generated by spectral representation and subsequently analyzed by non-linear shell finite elements. The application to an example I-Section Beam-column demonstrates that the simulated buckling response is in good agreement with experiments and follows key concepts of imperfection triggered buckling. The derivation of the buckling load variability and the stochastic interaction curve for combined compression and major axis bending as well as stochastic sensitivity studies for thickness and geometric imperfections illustrate potential benefits of the proposed methodology in buckling related research and applications.
Vissarion Papadopoulos - One of the best experts on this subject based on the ideXlab platform.
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Buckling analysis of imperfect I-Section Beam-columns with stochastic shell finite elements
Computational Mechanics, 2010Co-Authors: Dominik Schillinger, Vissarion Papadopoulos, Manfred Bischoff, Manolis PapadrakakisAbstract:Buckling loads of thin-walled I-Section Beam-columns exhibit a wide stochastic scattering due to the uncertainty of imperfections. The present paper proposes a finite element based methodology for the stochastic buckling simulation of I-Sections, which uses random fields to accurately describe the fluctuating size and spatial correlation of imperfections. The stochastic buckling behaviour is evaluated by crude Monte-Carlo simulation, based on a large number of I-Section samples, which are generated by spectral representation and subsequently analyzed by non-linear shell finite elements. The application to an example I-Section Beam-column demonstrates that the simulated buckling response is in good agreement with experiments and follows key concepts of imperfection triggered buckling. The derivation of the buckling load variability and the stochastic interaction curve for combined compression and major axis bending as well as stochastic sensitivity studies for thickness and geometric imperfections illustrate potential benefits of the proposed methodology in buckling related research and applications.
Manfred Bischoff - One of the best experts on this subject based on the ideXlab platform.
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Buckling analysis of imperfect I-Section Beam-columns with stochastic shell finite elements
Computational Mechanics, 2010Co-Authors: Dominik Schillinger, Vissarion Papadopoulos, Manfred Bischoff, Manolis PapadrakakisAbstract:Buckling loads of thin-walled I-Section Beam-columns exhibit a wide stochastic scattering due to the uncertainty of imperfections. The present paper proposes a finite element based methodology for the stochastic buckling simulation of I-Sections, which uses random fields to accurately describe the fluctuating size and spatial correlation of imperfections. The stochastic buckling behaviour is evaluated by crude Monte-Carlo simulation, based on a large number of I-Section samples, which are generated by spectral representation and subsequently analyzed by non-linear shell finite elements. The application to an example I-Section Beam-column demonstrates that the simulated buckling response is in good agreement with experiments and follows key concepts of imperfection triggered buckling. The derivation of the buckling load variability and the stochastic interaction curve for combined compression and major axis bending as well as stochastic sensitivity studies for thickness and geometric imperfections illustrate potential benefits of the proposed methodology in buckling related research and applications.
