用于非线性反应历史分析的地震动输入

G. Morris, A. Thompson, J. Dismuke, B. Bradley
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引用次数: 4

摘要

非线性反应历史分析(NLRHA),或所谓的“非线性时程分析”,是由实施基于性能的抗震设计和/或评估程序的执业结构工程师采用的。从NLRHA程序获得可靠输出的一个重要方面是输入地震动记录。地面运动选择和幅度标度程序的潜在意图是确保NLRHA的输入能够代表给定地点和结构的地面震动危险级别。本文的目的是强调新西兰(NZ)加载标准NZS 1170.5(2004)第5.5节和6.4节中地面运动选择和缩放要求的显著局限性。从新西兰监管的角度来看;地震危险性分析和地震动选择没有具体的框架(因此自我调节是目前的规范)。相比之下,NZS 1170.5包含许多关于扩展和应用记录的规范性要求,这些要求在实践中很难满足。内部还讨论了对新西兰更现代的指导文件的影响,例如2017年现有建筑的“评估指南”,其中引用了NZS 1170.5,这是一个至少有16年历史的标准(2002年发布的草案)。为了强调NZS 1170.5的上述问题,本文总结了美国标准ASCE 7-16(新建筑)和ASCE 41-17(现有建筑)中更现代的方法,以及美国对高层建筑更严格要求的一些例子。
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Ground motion input for nonlinear response history analysis
Nonlinear response history analysis (NLRHA), or so-called “nonlinear time history analysis”, is adopted by practicing structural engineers who implement performance-based seismic design and/or assessment procedures. One important aspect in obtaining reliable output from the NLRHA procedure is the input ground motion records. The underlying intention of ground motion selection and amplitude-scaling procedures is to ensure the input for NLRHA is representative of the ground shaking hazard level, for a given site and structure. The purpose of this paper is to highlight the salient limitations of the ground motion selection and scaling requirements in Sections 5.5 and 6.4 of the New Zealand (NZ) loading standard NZS 1170.5 (2004). From a NZ regulatory perspective; there is no specific framework for seismic hazard analysis and ground motion selection (thus self-regulation is the current norm). In contrast, NZS 1170.5 contains many prescriptive requirements for scaling and applying records which are challenging to satisfy in practice. Also discussed within, there are implications for more modern guidance documents in NZ, such as the 2017 “Assessment Guidelines” for existing buildings, which cite NZS 1170.5, a standard which is at least 16 years old (draft issued in 2002). To emphasize the above issues with NZS 1170.5, this paper presents a summary of the more contemporary approaches in the US standards ASCE 7-16 (new buildings) and ASCE 41-17 (existing buildings), along with some examples of the more stringent US requirements for Tall Buildings.
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来源期刊
CiteScore
2.50
自引率
17.60%
发文量
14
期刊最新文献
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