Collapse Assessment of Steel Moment Frames Based on E-Defense Full-Scale Shake Table Collapse Tests
Publication: Journal of Structural Engineering
Volume 139, Issue 1
Abstract
This paper presents key parameters that affect numerical modeling of steel frame structures for reliable collapse simulations. The collapse assessment is based on experimental data obtained from a full-scale shaking table collapse test of a 4-story steel moment frame and a blind numerical analysis contest that was organized in parallel with the collapse test. It is shown that (1) there is no clear advantage between three-dimensional (3D) and 2D analyses in the prediction of a sidesway collapse mechanism for buildings with a regular plan view as in the case of study; (2) the assumption of Rayleigh damping leads to better predictions of structural response compared with stiffness proportional damping; and (3) accurate prediction of collapse necessitates that effects always be considered in the analysis. It is also proven that accurate simulation of steel component deterioration is a key factor for reliable prediction of collapse behavior. On the basis of a synthesis of experimental and analytical studies, a few collapse mitigation alternatives are investigated. In particular, the effects of the strong-column/weak-beam ratio and exposed base plates on the collapse capacity are assessed. It is notable that a combination of bending strength increase and delay of local buckling in first-story columns is most effective for the enhancement of seismic performance against collapse.
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Acknowledgments
D. G. Lignos was supported by an overseas fellowship from the Japan Society for the Promotion of Science (JSPS, Award Number P09291). This support is acknowledged and is greatly appreciated. The test presented in this study was conducted as part of a comprehensive research project on quantification of the safety margin of structures under earthquake load administered by the National Research Institute for Earth Science and Earthquake Mitigation (NIED). The writers are grateful to Drs. Y. Okada and K. Abe of NIED, Prof. M. Ohsaki of Hiroshima University, and Prof. T. Hitaka of Kyoto University for their continuous support and valuable comments. The writers also thank Prof. Y. S. Yang of National Taipei University of Technology for his willingness to share the simulated response data of his 3D numerical model.
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Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 1 • January 2013
Pages: 120 - 132
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Mar 22, 2011
Accepted: Mar 7, 2012
Published online: Mar 10, 2012
Published in print: Jan 1, 2013
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