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Reliability Analysis of Steel SMRF and SCBF Structures Considering the Vertical Component of Near-Fault Ground Motions
| 题名： | Reliability Analysis of Steel SMRF and SCBF Structures Considering the Vertical Component of Near-Fault Ground Motions |
| 正文语种： | 英文 |
| 作者： | Jawad Fayaz, S.M.ASCE1; Farzin Zareian, M.ASCE2 |
| 作者单位： | 1Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of California, Irvine, CA 92697. 2Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Irvine, CA 92697 (corresponding author). |
| 关键词： | Structural reliability; Vertical ground motions; Steel structures; ASCE 7; Seismic provisions |
| 摘要： | This paper assesses the effects of the vertical component of ground motions on steel structures and evaluates the current seismic design provisions of ASCE 7 on the basis of a structural reliability outlook. Eight special moment-resisting frame (SMRF) and special concentrically braced frame braced frame (SCBF) steel structures were analyzed under two groups of near-fault (i.e., strike slip and reverse fault) ground motions. Detailed methodology for calculating the reliability index (β) of structural components is explained; β is computed for structural component actions including moment and shear in beams, axial load in braces, and axial load and moment in columns. Seismic provisions of ASCE 7 were developed with an intention of achieving target β of 1.75 for earthquake-resistant structural members. Results indicated that the implementation of current seismic load combinations, in which a load factor equal to 20% of design level short-period spectral acceleration on structural dead load is used to account for the effects of the vertical component of ground motions, results in β ～ 1.3 for most structural members. Application of structural system drift limits, however, resulted in increased member sizes in SMRFs by which β values larger than 1.75 were achieved. It is concluded that current seismic load combinations in ASCE 7 are inadequate to account for the effects of the vertical component of near-fault ground motions. Nevertheless, performance-based design provisions can provide a reasonable and adequate margin of safety against structural member failure. |
| 出版年： | 2019 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | 145 |
| 期： | 7 |
| 页码： | 1-15 |
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