The Experts below are selected from a list of 9321 Experts worldwide ranked by ideXlab platform
Samer Adeeb - One of the best experts on this subject based on the ideXlab platform.
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the effect of material stress strain characteristics on the ultimate stress and critical Buckling strain of flat plates subjected to uniform axial compression
Construction and Building Materials, 2018Co-Authors: Onyekachi Ndubuaku, Michael Martens, J Roger J Cheng, Samer AdeebAbstract:Abstract The Buckling Capacity of uniformly compressed flat plates has been investigated in this study. Material properties were characterized based on parameterization of the stress-strain curves using a simple and novel mathematical expression. Idealized stress-strain relationships were developed using the proposed material model and extensive parametric numerical analyses were conducted to investigate the effect of the material stress-strain properties on the Buckling Capacity of flat plates. For stress-strain curves with a yield plateau, the results of the parametric study showed a minimal influence of the material properties on the Buckling Capacity of the plates whereas a significant effect of the strain-hardening properties was observed in plates with round-house curves. Ultimately, the proposed stress-strain model was shown to be remarkably useful for capturing the relevant intricacies associated with material nonlinearity when predicting the Buckling Capacity and post-Buckling behavior of uniformly-compressed flat plates.
Onyekachi Ndubuaku - One of the best experts on this subject based on the ideXlab platform.
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the effect of material stress strain characteristics on the ultimate stress and critical Buckling strain of flat plates subjected to uniform axial compression
Construction and Building Materials, 2018Co-Authors: Onyekachi Ndubuaku, Michael Martens, J Roger J Cheng, Samer AdeebAbstract:Abstract The Buckling Capacity of uniformly compressed flat plates has been investigated in this study. Material properties were characterized based on parameterization of the stress-strain curves using a simple and novel mathematical expression. Idealized stress-strain relationships were developed using the proposed material model and extensive parametric numerical analyses were conducted to investigate the effect of the material stress-strain properties on the Buckling Capacity of flat plates. For stress-strain curves with a yield plateau, the results of the parametric study showed a minimal influence of the material properties on the Buckling Capacity of the plates whereas a significant effect of the strain-hardening properties was observed in plates with round-house curves. Ultimately, the proposed stress-strain model was shown to be remarkably useful for capturing the relevant intricacies associated with material nonlinearity when predicting the Buckling Capacity and post-Buckling behavior of uniformly-compressed flat plates.
Michael Martens - One of the best experts on this subject based on the ideXlab platform.
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the effect of material stress strain characteristics on the ultimate stress and critical Buckling strain of flat plates subjected to uniform axial compression
Construction and Building Materials, 2018Co-Authors: Onyekachi Ndubuaku, Michael Martens, J Roger J Cheng, Samer AdeebAbstract:Abstract The Buckling Capacity of uniformly compressed flat plates has been investigated in this study. Material properties were characterized based on parameterization of the stress-strain curves using a simple and novel mathematical expression. Idealized stress-strain relationships were developed using the proposed material model and extensive parametric numerical analyses were conducted to investigate the effect of the material stress-strain properties on the Buckling Capacity of flat plates. For stress-strain curves with a yield plateau, the results of the parametric study showed a minimal influence of the material properties on the Buckling Capacity of the plates whereas a significant effect of the strain-hardening properties was observed in plates with round-house curves. Ultimately, the proposed stress-strain model was shown to be remarkably useful for capturing the relevant intricacies associated with material nonlinearity when predicting the Buckling Capacity and post-Buckling behavior of uniformly-compressed flat plates.
J Roger J Cheng - One of the best experts on this subject based on the ideXlab platform.
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the effect of material stress strain characteristics on the ultimate stress and critical Buckling strain of flat plates subjected to uniform axial compression
Construction and Building Materials, 2018Co-Authors: Onyekachi Ndubuaku, Michael Martens, J Roger J Cheng, Samer AdeebAbstract:Abstract The Buckling Capacity of uniformly compressed flat plates has been investigated in this study. Material properties were characterized based on parameterization of the stress-strain curves using a simple and novel mathematical expression. Idealized stress-strain relationships were developed using the proposed material model and extensive parametric numerical analyses were conducted to investigate the effect of the material stress-strain properties on the Buckling Capacity of flat plates. For stress-strain curves with a yield plateau, the results of the parametric study showed a minimal influence of the material properties on the Buckling Capacity of the plates whereas a significant effect of the strain-hardening properties was observed in plates with round-house curves. Ultimately, the proposed stress-strain model was shown to be remarkably useful for capturing the relevant intricacies associated with material nonlinearity when predicting the Buckling Capacity and post-Buckling behavior of uniformly-compressed flat plates.
Yasser Sharifi - One of the best experts on this subject based on the ideXlab platform.
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neural network application for distortional Buckling Capacity assessment of castellated steel beams
Structures, 2020Co-Authors: Mahmoud Hosseinpour, Yasser Sharifi, Hojjat SharifiAbstract:Abstract Artificial Neural Network (ANN) model was developed as a reliable modeling method for simulating and predicting the ultimate moment capacities of castellated steel beams. The training and testing data for neural networks are obtained using Finite Element Analysis (FEA). For this purpose, a series of nonlinear finite element analyses have been carried out to simulate the distortional Buckling behavior of castellated steel beams, and the effects of nine independent parameters on the lateral-distortional Buckling mode, have been investigated. Moreover, unlike the existing design codes, the ANN model considers the effects of web distortion on the ultimate Buckling strength of beams. Then, a new formula based on ANNs has been proposed to predict the ultimate moment capacities of castellated steel beams subjected to lateral-distortional Buckling. The attempt was done to evaluate a practical formula considering all parameters which may affect the distortional Capacity of castellated steel beams. Then, a sensitivity analysis using Garson’s algorithm has been developed to determine the importance of each input parameter. Finally, a comparison has been made between the proposed formula and the predictions obtained from AS4100, EC3, and AISC codes. It is shown that the proposed formula is more accurate than these design codes.
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Lateral Torsional Buckling Capacity Assessment of Castellated Steel Beams Using Artificial Neural Networks
International Journal of Steel Structures, 2019Co-Authors: Yasser Sharifi, Mahmoud Hosseinpour, Adel Moghbeli, Hojjat SharifiAbstract:A new model based on Artificial Neural Network (ANN) was established as a trustworthy technique for predicting ultimate lateral torsional Buckling (LTB) Capacity of castellated steel beams. The required information for training, validating and testing of the developed model obtained from a reliable database. Consequently, a new formulation based on the ANN has been offered for predicting the failure load of castellated steel beams exposed to LTB. All parameters which may affect the LTB Capacity of castellated beams were considered for presentation of this formula. Then, outcomes of the proposed formula were compared with predictions of Australian Standard (AS4100) for LTB Capacity of castellated beams. This comparison indicated that proposed formula has a good performance for prediction of ultimate strength in castellated beams subjected to LTB. At the end, Garson’s algorithm has been established as a sensitivity analysis to determinate importance of each input in the proposed formula.
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neural networks for inelastic distortional Buckling Capacity assessment of steel i beams
Thin-walled Structures, 2015Co-Authors: Sajjad Tohidi, Yasser SharifiAbstract:Abstract An Artificial Neural Network (ANN) model is developed as a reliable modeling method for simulating and predicting the ultimate moment capacities for intermediate doubly-symmetric steel I-beams. The training and testing data for neural network are generated using Finite Element Analysis (FEA). In other word, an extensive numerical study was also undertaken to investigate the distortional Buckling behavior of simply supported compact steel I-beams. A series of nonlinear elasto-plastic FE analyses have been carried out to simulate the distortional Buckling behavior of doubly-symmetric steel I-beams, and the effects of six independent parameters as input in a lateral-distortional Buckling mode has been investigated. Moreover, unlike the existing design codes the model considers the effect of web distortions in a lateral-distortional Buckling mode. Then a new formula based on the ANNs has been proposed to predict the member moment capacities of steel I-beams subjected to distortional Buckling. The attempt was done to evaluate a practical formula considering all parameters which may affect distortional Capacity. Then, a comparison has been made between the proposed formula and the predictions from the current design rules in some structural steel codes. The results show that the proposed formula is more accurate and applicable than existing design codes. Finally, a sensitivity analysis using Garson׳s algorithm has been also developed to determine the importance of each input parameters.
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Restrained distortional Buckling Capacity of half-through bridge girders
The IES Journal Part A: Civil & Structural Engineering, 2014Co-Authors: Sajjad Tohidi, Yasser SharifiAbstract:Steel beams with continuous and complete tension flange restraint buckle in a restrained distortional Buckling (RDB) mode. Lateral Buckling of half-through girders is an important example of this phenomenon because of the restraint offered by the deck, and due to the flexibility of the web in restraining the compressive flange. A numerical study was undertaken to investigate the distortional Buckling behaviour of simply supported compact steel I-beams subjected to uniformly distributed load. For this purpose, a finite-element model was developed using ABAQUS. It was then used in a parametric study to simulate the distortional Buckling behaviour and Capacity of half-through girders, and investigate the effect of cross-section geometry and yield strengths in a RDB mode on the Buckling moments of doubly-symmetric steel I-beams. Then a new formula based on the regression analyses has been proposed to predict the member moment capacities of steel I-beams subjected to RDB. The results indicate that the proposed...
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Buckling Capacity of uniformly corroded steel members in terms of exposure time
Steel and Composite Structures, 2010Co-Authors: Reza Rahgozar, Yasser Sharifi, Mohsen MalekinejadAbstract:Most of steel structures in various industries are subjected to corrosion due to environmental exposure. Corrosion damage is a serious problem for these structures which may reduce their carrying Capacity. These aging structures require maintenance and in many cases, replacement. The goal of this research is to consider the effects of corrosion by developing a model that estimates corrosion loss as a function of exposure time. The model is formulated based on average measured thickness data collected from three severely corroded I-beams (nearly 30 years old). Since corrosion is a time-dependent parameter. Analyses were performed to calculate the lateral Buckling Capacity of steel beam in terms of exposure time. Minimum curves have been developed for assessment of the remaining lateral Buckling Capacity of ordinary I-beams based on the loss of thicknesses in terms of exposure time. These minimum curves can be used by practicing engineers for better estimates on the service life of corrosion damaged steel beams.
