Effects of column base behaviour on the overall response of steel moment frames

Student: Masahiro Kurata
Supervisor: Prof. Masayoshi Nakashima

Abstract

The plastic deformation behavior of embedded-type column bases was examined by experimental tests and finite element analysis. Primary parameters were width-to-thickness ratio and axial load ratio. Test results showed significant strength deterioration induced by local buckling that was largely affected by the applied parameters. Analytical models of the test specimens were developed. The developed models were applied for nonlinear seismic response analysis of low and mid-rise steel moment frames. The analysis results showed the importance of considering deterioration behavior of column bases as it significantly affected the response and the collapse limit. Large dependency of the collapse limit on the width-to-thickness ratio of column in addition to the strength itself is also noted from the analysis.

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