| Seismic vulnerability evaluation of axially loaded steel built-up laced members Ⅱ： evaluations |
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| 作者姓名： | Kangmin Lee ;Michel Bruneau |
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| 作者单位： | [1]Department of Architectural Engineering, Chungnam National University, Korea; [2]Department of Civil, Structural, and Environmental Engineering, University at Buffalo, State University of New York, USA |
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| 基金项目： | Supported by： Federal Highway Administration Under Grant No. DTFH61-98-C-00094 Received .Acknowledgements This work was conducted at the University at Buffalo and was supported by the Federal Highway Administration under contract number DTFH61-98-C- 00094 to the Multidisciplinary Center for Earthquake Engineering Research. However, any opinions, findings, conclusions, and recommendations presented in this paper are those of the authors and do not necessarily reflect the views of the sponsors. |
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| 摘 要： | The test results described in Part 1 of this paper （Lee and Bruneau, 2008） on twelve steel built-up laced members （BLMs） subjected to quasi-static loading are analyzed to provide better knowledge on their seismic behavior. Strength capacity of the BLM specimens is correlated with the strength predicted by the AISC LRFD Specifications. Assessments of hysteretic properties such as ductility capacity, energy dissipation capacity, and strength degradation after buckling of the specimen are performed. The compressive strength of BLMs is found to be relatively well predicted by the AISC LRFD Specifications. BLMs with smaller kl/r were ductile but failed to reach the target ductility of 3.0 before starting to fracture, while those with larger kl/r could meet the ductility demand in most cases. The normalized energy dissipation ratio, EC/ET and the normalized compressive strength degradation, Cr″/Cr of BLMs typically decrease as normalized displacements δ/δb,exp increase, and the ratios for specimens with larger kl/r dropped more rapidly than for specimens with smaller kl/r; similar trends were observed for the monolithic braces. The BLMs with a smaller slenderness ratio, kl/r, and width-to-thickness ratio, b/t, experienced a larger number of inelastic cycles than those with larger ratios.
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| 关 键 词： | 易损性 压缩性能 强度容量 能量耗散 |
Seismic vulnerability evaluation of axially loaded steel built-up laced members II: evaluations |
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| Kangmin Lee,;Michel Bruneau.Seismic vulnerability evaluation of axially loaded steel built-up laced members II: evaluations[J].Earthquake Engineering and Engineering Vibration,2008,7(2):125-136. |
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| Authors: | Kangmin Lee Michel Bruneau |
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| Institution: | [1]Department of Architectural Engineering, Chungnam National University, Korea [2]Department of Civil, Structural, and Environmental Engineering, University at Buffalo, State University of New York, USA |
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| Abstract: | The test results described in Part 1 of this paper (Lee and Bruneau, 2008) on twelve steel built-up laced members (BLMs) subjected
to quasi-static loading are analyzed to provide better knowledge on their seismic behavior. Strength capacity of the BLM specimens
is correlated with the strength predicted by the AISC LRFD Specifications. Assessments of hysteretic properties such as ductility
capacity, energy dissipation capacity, and strength degradation after buckling of the specimen are performed. The compressive
strength of BLMs is found to be relatively well predicted by the AISC LRFD Specifications. BLMs with smaller kl/r were ductile but failed to reach the target ductility of 3.0 before starting to fracture, while those with larger kl/r could meet the ductility demand in most cases. The normalized energy dissipation ratio, E
C/E
T and the normalized compressive strength degradation, C
r″/C
r of BLMs typically decrease as normalized displacements δ/δ
b,exp increase, and the ratios for specimens with larger kl/r dropped more rapidly than for specimens with smaller kl/r; similar trends were observed for the monolithic braces. The BLMs with a smaller slenderness ratio, kl/r, and width-to-thickness ratio, b/t, experienced a larger number of inelastic cycles than those with larger ratios.
Supported by: Federal Highway Administration Under Grant No. DTFH61-98-C-00094 |
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| Keywords: | seismic vulnerability built-up compression member strength capacity ductility capacity energy dissipation strength degradation |
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