Cyclic Behaviors of SHS Columns in Low Cycle Fatigue Tests

ABSTRACT

The damage caused by small inelastic loadings cannot be neglected when the number of cycles is large. Previous research has mainly focused on the low cycle fatigue (LCF) behaviors of beam-to-column connections, ignoring those of columns. Here, cyclic loading tests were conducted on 22 cold-roll-formed square hollow section columns under multiple small-amplitude loadings. All the specimens failed owing to flange fracture. The effects of the axial force ratio, shear span ratio, and loading amplitude on the LCF behaviors were investigated. Fatigue life prediction methods were developed, and two methods for predicting the lateral resistance deterioration of the specimens were proposed.

KEYWORDS:

• Square hollow sections
• steel columns
• cyclic loading
• small loading amplitude
• low cycle fatigue
• strength deterioration prediction

Acknowledgements

This research is a part of the research project in the Building Research Institute and was conducted as collaborative research work with the Tokyo Institute of Technology, Osaka University, the University of Tokyo, Kyoto University and Japanese Society of Steel Construction. Part of this project is also financially supported by the Japan Iron and Steel Federation. The first author appreciates the China Scholarship Council (CSC) for supporting his daily life and study. We extend our appreciation to Kazumasa Mogi and Jiaxi Li for their participation in the experiment.

Data Availability Statement

All test data that support the findings of this study are available from the corresponding author upon reasonable request.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work was supported by the China Scholarship Council [n.a.]; The Japan Iron and Steel Federation [n.a.]