A SEISMIC PERFORMANCE EVALUATION METHOD FOR STEEL STRUCTURES AGAINST LOCAL BUCKLING AND EXTRA-LOW CYCLE FATIGUE

作者：Ge Hanbin^*; Luo Xiaoqun

来源：Journal of Earthquake and Tsunami, 2011, 5(2): 83-99.

DOI：10.1142/S1793431111001005

• Local buckling
• ELCF
• seismic verification

A practical performance evaluation method against local buckling and extra-low cycle fatigue (ELCF) is proposed in this study for steel structures. For thin-walled steel structures, local buckling is the main failure mode while brittle fracture due to ductile crack initiation under ELCF loading should be the dominant failure in thick-walled steel structures. A damage index verification method based on an FEM analysis using shell elements was previously presented by the authors to evaluate such a ductile failure. In the present study, a simplified verification method based on a fiber model FEM analysis using beam elements is proposed and the damage index is modified to consider strain concentration effects. Comparisons between experimental and analytical results show good prediction of ductile crack initiation in the current study. Finally, a unified verification method against local buckling and ELCF is summarized.

• 出版日期2011-6
• 单位同济大学