Risk-Informed Mean Recurrence Intervals for Updated Wind Maps in ASCE 7-16.
Risk-Informed Mean Recurrence Intervals for Updated Wind Maps in ASCE 7-16.
复制标题
ASCE 7-16 中更新风图的风险告知平均重现间隔。
DOI：
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发表时间：
2018
影响因子：
4.1
通讯作者：
B. Ellingwood
中科院分区：
文献类型：
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作者：
T. McAllister;Naiyu Wang;B. Ellingwood
ASCE 7正朝着采用与基于性能的工程（PBE）的风险设计目标相一致的荷载要求的方向发展。ASCE 7-10提供的风图分别对应于风险类别I、II和组合III/IV的重现期为300年、700年和1，700年。在PBE中，风险类别III和IV的建筑物和其他结构（指定为基本设施）的风险目标不同。本文中报告的可靠性分析使用更新的风荷载数据进行，以（1）确认ASCE 7-10中已有的重现期也适用于风险知情PBE，以及（2）确定风险类别IV的新的基于风险的重现期。使用最近风洞试验中获得的风向系数Kd数据表明，与II类风险结构的风荷载组合相关的可靠性实际上与ASCE 7重力荷载组合相关的可靠性一致。本文表明，ASCE 7-16中的新风图（分别基于风险类别I、II、III和IV的300年、700年、1，700年和3，000年重现期）实现了ASCE 7-16第1.3.1.3节中关于非飓风风荷载的可靠性目标。
ASCE 7 is moving toward adopting load requirements that are consistent with risk-informed design goals characteristic of performance-based engineering (PBE). ASCE 7-10 provided wind maps that correspond to return periods of 300, 700, and 1,700 years for Risk Categories I, II, and combined III/IV, respectively. The risk targets for Risk Categories III and IV buildings and other structures (designated as essential facilities) are different in PBE. The reliability analyses reported in this paper were conducted using updated wind load data to (1) confirm that the return periods already in ASCE 7-10 were also appropriate for risk-informed PBE, and (2) to determine a new risk-based return period for Risk Category IV. The use of data for wind directionality factor, Kd , which has become available from recent wind tunnel tests, revealed that reliabilities associated with wind load combinations for Risk Category II structures are, in fact, consistent with the reliabilities associated with the ASCE 7 gravity load combinations. This paper shows that the new wind maps in ASCE 7-16, which are based on return periods of 300, 700, 1,700, and 3,000 years for Risk Categories I, II, III, and IV, respectively), achieve the reliability targets in Section 1.3.1.3 of ASCE 7-16 for nonhurricane wind loads.