A Combined Direct Analysis and Direct Strength Approach to Predict the Flexural Strength of Z-Purlins with Paired Torsion Braces

Document Type

Conference Paper

Publication Date

2016

Publication Title

CCFSS Proceedings of International Specialty Conference on Cold Formed Steel Structures

Pages

729-743

Conference Name

Wei-Wen Yu International Specialty Conference on Cold-Formed Steel Structures, November 9-10, 2016, Baltimore, Maryland

Abstract

A series of 12 Base Tests for Z-section purlins with paired interior torsional braces and one flange attached to a flexible horizontal diaphragm are evaluated with the Direct Strength Method. Rather than use the conventional constrained bending stress approximation, a direct analysis philosophy is adopted where cross section stress distributions are calculated using a displacement compatibility approach. With a flexible diaphragm typical of a standing seam roof system, these stresses can deviate substantially from the constrained bending approximation and can significantly impact predicted local and distortional buckling behavior. The displacement compatibility approach incorporates estimates of load imbalances and second order effects that result from the standard base test procedure. Predicted local and distortional buckling strength shows good correlation to tested strength.

Rights

© 2018 Missouri University of Science and Technology, All rights reserved.

Metadata link included with gratitude to Curtis Laws Wilson Library.

Original Publication Citation

Seek, Michael W.; Ramseyer, Chris; and Kaplan, Ian, "A Combined Direct Analysis and Direct Strength Approach to Predict the Flexural Strength of Z-Purlins with Paired Torsion Braces" (2016). CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018). 5.
https://scholarsmine.mst.edu/isccss/23iccfss/session9/5

ORCID

0000-0002-9137-8222 (Seek)

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