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  4. Sensitivity of Simulated Steel Column Instabilities to Plasticity Model Assumptions
 
conference paper

Sensitivity of Simulated Steel Column Instabilities to Plasticity Model Assumptions

Hartloper, Alexander Riley  
•
Sousa, Albano António  
•
Lignos, Dimitrios  
June 17, 2019
Proceedings of the 12th Canadian Conference on Earthquake Engineering (12CCEE)
12th Canadian Conference on Earthquake Engineering (12CCEE)

Current experimental studies on the seismic behavior of steel wide-flange columns under multi-axis cyclic loading reveal that these members, depending on their geometric characteristics, may be susceptible to axial shortening, out-of-plane deformations and lateral-torsional buckling coupled with local buckling. In that respect, simulation models have intrinsic value to generalize the previous experimental findings in a wider range of member sizes and aid the further development of our seismic design and assessment standards. Prior work on continuum finite element (CFE) modeling of steel wide-flange columns stressed the importance of the proper consideration of local and member imperfections within the CFE model. The assumptions underlying the steel material model, particularly its hardening laws, along with the methodology for obtaining its input parameters, have been overlooked. The main issue explored in this paper centers on the fact that commonly used nonlinear isotropic/kinematic plasticity models within CFE simulation platforms were originally developed for stainless steels. Therefore, they do not represent the discontinuous yielding phenomenon present in typical structural mild steels. Nonlinear analyses conducted in this paper underscores that the predicted buckling modes are sensitive to the choice of material model for a class of steel wide-flange columns.

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Type
conference paper
Author(s)
Hartloper, Alexander Riley  
Sousa, Albano António  
Lignos, Dimitrios  
Date Issued

2019-06-17

Publisher place

Quebec

Published in
Proceedings of the 12th Canadian Conference on Earthquake Engineering (12CCEE)
Total of pages

8

Subjects

material model

•

modeling recommendations

•

instabilities

•

steel columns

•

multi-axis plasticity

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
RESSLAB  
GIS-GE  
Event nameEvent placeEvent date
12th Canadian Conference on Earthquake Engineering (12CCEE)

Quebec, Canada

June 17-20, 2019

Available on Infoscience
June 29, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/158685
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