Experimental and numerical evaluation of steel columns for performance-based seismic assessment of steel moment frames
Experimental and numerical evaluation of steel columns for performance-based seismic assessment of steel moment frames
This paper summarizes the findings of a long term experimental program corroborated with detailed finite element simulations that investigated the hysteretic behavior of wide-flange columns in steel moment-resisting frames (MRFs) designed in highly seismic regions. Several aspects of the steel column behavior are thoroughly investigated. It is shown that steel column axial shortening is a failure mode that strongly influences the steel column stability under earthquake-induced loading. The amount of axial shortening can be considerably different in interior columns compared to end (exterior) columns that experience transient axial load demands due to dynamic overturning effects. Axial shortening is typically followed by column out-of-plane deformations that become maximum near the dissipative plastic hinge zone and migrate near the column top end. This failure mode is strongly influenced by the considered column end boundary conditions. Routinely used symmetric loading histories provide insufficient information for modeling the cyclic deterioration in flexural strength and stiffness of steel columns near collapse. Modeling recommendations for updated backbone parameters for nonlinear modeling of steel columns are proposed inline with the current ASCE 41 nonlinear modeling recommendations for performance-based seismic assessment of steel moment frames.
Steel columns, Column axial shortening, Cyclic deterioration, Nonlinear modeling, full-scale testing, ASCE 41
13-15
Lignos, Dimitrios G.
9f55ad65-7b12-4ad6-972c-5a967ec0497b
Elkady, Ahmed
8e55de89-dff4-4f84-90ed-6af476e328a8
Suzuki, Yusuke
e7f0950d-ec9e-4756-81ec-179d2e8119d9
Hartloper, Alexander
4354c701-3e6f-4378-b8eb-d78bd60d094e
October 2017
Lignos, Dimitrios G.
9f55ad65-7b12-4ad6-972c-5a967ec0497b
Elkady, Ahmed
8e55de89-dff4-4f84-90ed-6af476e328a8
Suzuki, Yusuke
e7f0950d-ec9e-4756-81ec-179d2e8119d9
Hartloper, Alexander
4354c701-3e6f-4378-b8eb-d78bd60d094e
Lignos, Dimitrios G., Elkady, Ahmed, Suzuki, Yusuke and Hartloper, Alexander
(2017)
Experimental and numerical evaluation of steel columns for performance-based seismic assessment of steel moment frames.
Beskos, D., Zhou, Y., Qian, J. and Lu, X.
(eds.)
In PESDES 2017 International Workshop on Performance-Based Seismic Design of Structures.
Tongji University.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
This paper summarizes the findings of a long term experimental program corroborated with detailed finite element simulations that investigated the hysteretic behavior of wide-flange columns in steel moment-resisting frames (MRFs) designed in highly seismic regions. Several aspects of the steel column behavior are thoroughly investigated. It is shown that steel column axial shortening is a failure mode that strongly influences the steel column stability under earthquake-induced loading. The amount of axial shortening can be considerably different in interior columns compared to end (exterior) columns that experience transient axial load demands due to dynamic overturning effects. Axial shortening is typically followed by column out-of-plane deformations that become maximum near the dissipative plastic hinge zone and migrate near the column top end. This failure mode is strongly influenced by the considered column end boundary conditions. Routinely used symmetric loading histories provide insufficient information for modeling the cyclic deterioration in flexural strength and stiffness of steel columns near collapse. Modeling recommendations for updated backbone parameters for nonlinear modeling of steel columns are proposed inline with the current ASCE 41 nonlinear modeling recommendations for performance-based seismic assessment of steel moment frames.
Text
2017 Lignos & Elkady & Suzuki & Hartloper - Experimental and numerical evaluation of steel columns for performance-based seismic assessment of steel moment frames
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Published date: October 2017
Venue - Dates:
International Workshop on<br/>Performance-Based Seismic Design of Structures, Tongii University, Shanghai, China, 2017-10-13 - 2017-10-15
Keywords:
Steel columns, Column axial shortening, Cyclic deterioration, Nonlinear modeling, full-scale testing, ASCE 41
Identifiers
Local EPrints ID: 433677
URI: http://eprints.soton.ac.uk/id/eprint/433677
PURE UUID: 7c2e69bf-01a0-4ba0-978c-94cb148f8e84
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Date deposited: 30 Aug 2019 16:30
Last modified: 16 Mar 2024 04:41
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Contributors
Author:
Dimitrios G. Lignos
Author:
Yusuke Suzuki
Author:
Alexander Hartloper
Editor:
D. Beskos
Editor:
Y. Zhou
Editor:
J. Qian
Editor:
X. Lu
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