Multi-Axial Fatigue Behavior of High-Strength Structural Bolts

Abstract

In this study, the fatigue failure of high-strength bolts (galvanized and regular) was experimentally and analytically explored under different tension-to-shear cyclic loading ratios. The observed cracking mechanisms were found to be a function of the bolt types and loading conditions. Though the cracks in the galvanized bolts followed the helical shape of the threads, the cracks for the regular bolts were parallel to the shear plan. The predicted fatigue lives under the combined tension and shear loads using the analytical approach matched the experimental results. Utilizing Eurocode S–N curves for independent tension and shear demands overestimated the fatigue life of bolts under multi-axial stresses. The resulting S–N curves obtained from this study can aid engineers in designing connections where bolts are subjected to multi-axial fatigue load.

Department(s)

Civil, Architectural and Environmental Engineering

Comments

Engineer Research and Development Center, Grant W912HZ-15-P-0045

Keywords and Phrases

Connections; Fatigue life; High-strength bolts; Multi-axial fatigue

International Standard Serial Number (ISSN)

0143-974X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

01 Jun 2023

Link to Full Text

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