Probabilistic basis for 2000 SAC Federal Emergency Management Agency steel moment frame guidelines
Probabilistic basis for 2000 SAC Federal Emergency Management Agency steel moment frame guidelines
复制标题
DOI：
10.1061/(asce)0733-9445(2002)128:4(526
复制
发表时间：
2002-04-01
影响因子：
4.1
通讯作者：
Foutch, DA
中科院分区：
文献类型：
--
作者：
Cornell, CA;Jalayer, F;Foutch, DA
本文提出了一种用于结构抗震设计和评估的正式概率框架及其在钢抗弯框架建筑中的应用。这是2000年SAC联邦紧急事务管理局（FEMA）钢抗弯框架指南的概率基础。该框架基于实现一个性能目标，该目标表示为超过特定性能水平的概率。性能水平被量化为与通用结构变量“需求”和“能力”相关的表达式，这些变量由结构的非线性动态位移来描述。常用的概率分析工具用于卷积地震动强度、结构“需求”和结构系统“能力”的随机性和不确定性特征，以便推导出达到特定性能水平的概率表达式。基于这个概率框架，开发了一种传统的“荷载与抗力系数”类型的安全检查格式，其中荷载和抗力项分别被更通用的“需求”和“能力”项所取代。这个框架还考虑了性能目标的实现。这种格式是基于关于性能目标实现可能性的定量置信陈述。这种格式已被SAC/FEMA指南采用。
This paper presents a formal probabilistic framework for seismic design and assessment of structures and its application to steel moment-resisting frame buildings. This is the probabilistic basis for the 2000 SAC Federal Emergency Management Agency (FEMA) steel moment frame guidelines. The framework is based on realizing a performance objective expressed as the probability of exceeding a specified performance level. Performance levels are quantified as expressions relating generic structural variables "demand" and "capacity" that are described by nonlinear, dynamic displacements of the structure. Common probabilistic analysis tools are used to convolve both the randomness and uncertainty characteristics of ground motion intensity, structural "demand," and structural system "capacity" in order to derive an expression for the probability of achieving the specified performance level. Stemming from this probabilistic framework, a safety-checking for-mat of the conventional "load and resistance factor" kind is developed with load and resistance terms being replaced by the more generic terms "demand" and "capacity," respectively. This framework also allows for a peformance objective being met. This format has been format based on quantitative confidence statements regarding the likelihood of the performance objective being met. This format has been adopted in the SAC/FEMA guidelines.