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Improved seismic design and nonlinear modeling recommendations for wide-flange steel columns

Improved seismic design and nonlinear modeling recommendations for wide-flange steel columns
Improved seismic design and nonlinear modeling recommendations for wide-flange steel columns

This paper presents the findings of parametric finite-element (FE) simulations of more than 50 wide-flange steel columns under cyclic loading. The column sizes, which are mostly highly ductile according to the current design practice in North America, are those seen in new and existing steel seismic-resistant moment frames. The parametric study is based on a high-fidelity FE model, which is thoroughly validated with available full-scale steel column experimental data. In the FE simulations, variations in the employed lateral loading history, the applied axial load ratio was considered to assess and refine a number of provisions related to the seismic design of steel moment-resisting-frame columns. The assessment is based on a number of performance indicators, including the column axial shortening and corresponding plastic hinge length, the column plastic rotation capacity influenced by local and global geometric instabilities, and the lateral stability bracing force demands. Empirical expressions are proposed to estimate these performance indicators as a function of geometric and loading parameters. Based on these expressions, seismic design recommendations are proposed to maintain column stability. A comparison is also made with current standards with respect to nonlinear modeling provisions for steel columns, and specific recommendations are proposed to update the limits for force-controlled wide-flange steel columns.

ASCE 41, Column axial shortening, Finite-element modeling, Loading history, Out-of-plane brace force, Plastic hinge length, Steel columns
0733-9445
Elkady, Ahmed
8e55de89-dff4-4f84-90ed-6af476e328a8
Lignos, Dimitrios G.
9f55ad65-7b12-4ad6-972c-5a967ec0497b
Elkady, Ahmed
8e55de89-dff4-4f84-90ed-6af476e328a8
Lignos, Dimitrios G.
9f55ad65-7b12-4ad6-972c-5a967ec0497b

Elkady, Ahmed and Lignos, Dimitrios G. (2018) Improved seismic design and nonlinear modeling recommendations for wide-flange steel columns. Journal of Structural Engineering (United States), 144 (9), [04018162]. (doi:10.1061/(ASCE)ST.1943-541X.0002166).

Record type: Article

Abstract

This paper presents the findings of parametric finite-element (FE) simulations of more than 50 wide-flange steel columns under cyclic loading. The column sizes, which are mostly highly ductile according to the current design practice in North America, are those seen in new and existing steel seismic-resistant moment frames. The parametric study is based on a high-fidelity FE model, which is thoroughly validated with available full-scale steel column experimental data. In the FE simulations, variations in the employed lateral loading history, the applied axial load ratio was considered to assess and refine a number of provisions related to the seismic design of steel moment-resisting-frame columns. The assessment is based on a number of performance indicators, including the column axial shortening and corresponding plastic hinge length, the column plastic rotation capacity influenced by local and global geometric instabilities, and the lateral stability bracing force demands. Empirical expressions are proposed to estimate these performance indicators as a function of geometric and loading parameters. Based on these expressions, seismic design recommendations are proposed to maintain column stability. A comparison is also made with current standards with respect to nonlinear modeling provisions for steel columns, and specific recommendations are proposed to update the limits for force-controlled wide-flange steel columns.

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More information

Accepted/In Press date: 4 April 2018
e-pub ahead of print date: 5 July 2018
Published date: 1 September 2018
Keywords: ASCE 41, Column axial shortening, Finite-element modeling, Loading history, Out-of-plane brace force, Plastic hinge length, Steel columns

Identifiers

Local EPrints ID: 433852
URI: http://eprints.soton.ac.uk/id/eprint/433852
ISSN: 0733-9445
PURE UUID: 4e6302a7-e802-4f53-af51-b7b8c5f46bec
ORCID for Ahmed Elkady: ORCID iD orcid.org/0000-0002-1214-6379

Catalogue record

Date deposited: 04 Sep 2019 16:30
Last modified: 06 Jun 2024 02:06

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Contributors

Author: Ahmed Elkady ORCID iD
Author: Dimitrios G. Lignos

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