Session Start Date

11-6-2014

Session End Date

11-6-2014

Abstract

This paper studies the energy dissipation and damage in thin walled members that experience local buckling and presents an approach to model cold-formed steel (CFS) axial members that experience local buckling deformations. The model is implemented in OpenSees using hysteretic models for CFS axial members calibrated using experimental responses. Results from thin-shell element simulations using ABAQUS show that energy dissipation in thin plates dissipates through inelastic strains and yielding that concentrates in damaged zones that extent approximately the length of a buckled half-wave (Lcr). Generally damage accumulates in one zone but when more than one damaged zone occurred the energy dissipation increased proportionally. The results from the plate simulation and experimental results from cyclic tests on axially loaded CFS members (previously performed by the authors) support the assumptions for the modeling approach presented for CFS members governed by local buckling. Results demonstrate the capabilities of the modeling approach to efficiently and accurately simulate the response of the CFS axial members experiencing local buckling. The model presented can be used to facilitate the performance assessment of cold-formed steel lateral load resisting systems (e.g., shear walls) under different hazard/performance levels, a capability needed for the advance of performance-based earthquake engineering of cold-formed steel buildings.

Department(s)

Civil, Architectural and Environmental Engineering

Research Center/Lab(s)

Wei-Wen Yu Center for Cold-Formed Steel Structures

Sponsor(s)

American Iron and Steel Institute

Meeting Name

22nd International Specialty Conference on Cold-Formed Steel Structures

Publisher

Missouri University of Science and Technology

Publication Date

11-6-2014

Document Version

Final Version

Rights

© 2014 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Local Buckling Hysteretic Nonlinear Models for Cold-Formed Steel Axial Members

This paper studies the energy dissipation and damage in thin walled members that experience local buckling and presents an approach to model cold-formed steel (CFS) axial members that experience local buckling deformations. The model is implemented in OpenSees using hysteretic models for CFS axial members calibrated using experimental responses. Results from thin-shell element simulations using ABAQUS show that energy dissipation in thin plates dissipates through inelastic strains and yielding that concentrates in damaged zones that extent approximately the length of a buckled half-wave (Lcr). Generally damage accumulates in one zone but when more than one damaged zone occurred the energy dissipation increased proportionally. The results from the plate simulation and experimental results from cyclic tests on axially loaded CFS members (previously performed by the authors) support the assumptions for the modeling approach presented for CFS members governed by local buckling. Results demonstrate the capabilities of the modeling approach to efficiently and accurately simulate the response of the CFS axial members experiencing local buckling. The model presented can be used to facilitate the performance assessment of cold-formed steel lateral load resisting systems (e.g., shear walls) under different hazard/performance levels, a capability needed for the advance of performance-based earthquake engineering of cold-formed steel buildings.