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Reliability-Based Design Snow Loads. II: Reliability Assessment and Mapping Procedures
| 题名： | Reliability-Based Design Snow Loads. II: Reliability Assessment and Mapping Procedures |
| 正文语种： | 英文 |
| 作者： | Abbie B. Liel, Ph.D., P.E., M.ASCE; D. Jared DeBock, Ph.D., P.E., M.ASCE; James R. Harris, Ph.D., P.E., F.ASCE; Bruce R. Ellingwood, Ph.D., P.E., Dist.M.ASCE;Jeannette M. Torrents, P.E. |
| 作者单位： | Univ, of Colorado;California State Univ |
| 关键词： | Building codes; Ground snow loads; Probability distributions; Statistical inference; Structural reliability; Structural safety and reliability. |
| 摘要： | This paper describes the development of reliability-targeted ground snow load maps for use in building (roof) design. The proposed procedures aim to ensure that structures designed achieve a target safety index, taken to be 3.0 as defined in ASCE 7 (ASCE 2010). When applied to the U.S. state of Colorado, the reliability-targeted mapping procedure shows that to achieve this target reliability index, design ground snow loads may need to be larger or smaller than the 50-year return period load that ASCE 7 currently stipulates for design, depending on the site and winter climate conditions at that site. Sites with larger coefficients of variation in the annual maximum snow load (in Colorado, lower-altitude sites) generally need design loads larger than the 50-year values. The paper also advances snow reliability assessment procedures through the proposal of a new model for the ground-to-roof conversion factor needed for quantifying roof snow loads as a function of ground snow loads. Spatial smoothing and altitude-dependent mapping procedures are described. DOI: 10.1061/(ASCE) ST.1943-541X.0001732. © 2017 American Society of Civil Engineers. |
| 出版日期： | 2017.07 |
| 出版年： | 2017 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | Vol.143 |
| 期： | NO.07 |
| 页码： | 04017047 |
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