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The displacement coefficient method in near-source conditions

机译：近源条件下的位移系数法

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摘要

The use of nonlinear static procedures for performance-based seismic design (PBSD) and assessment is a well-established practice, which has found its way into modern codes for quite some time. On the other hand, near-source (NS) ground motions are receiving increasing attention, because they can carry seismic demand systematically different and larger than that of the so-called ordinary records. This is due to phenomena such as rupture forward directivity (FD), which can lead to distinct pulses appearing in the velocity time-history of the ground motion. The framework necessary for taking FD into account in probabilistic seismic hazard analysis (PSHA) has recently been established. The objective of the present study is to discuss the extension of nonlinear static procedures, specifically the displacement coefficient method (DCM), with respect to the inelastic demand associated with FD. In this context, a methodology is presented for the implementation of the DCM toward estimating NS seismic demand, by making use of the results of NS-PSHA and a semi-empirical equation for NS-FD inelastic displacement ratio. An illustrative application of the DCM, with explicit inclusion of NS-pulse-like effects, is given for a set of typical plane R/C frames designed under Eurocode provisions. Different scenarios are considered in the application and nonlinear dynamic analysis results are obtained and discussed with respect to the static procedure estimates. Conclusions drawn from the results may help to assess the importance of incorporating NS effects in PBSD. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：非线性静态程序用于基于性能的抗震设计（PBSD）和评估是一种行之有效的做法，已经有相当长的一段时间将其应用于现代规范中。另一方面，近源（NS）地震动正受到越来越多的关注，因为它们所承载的地震需求与所谓的普通记录相比有系统地不同并且更大。这是由于诸如正向指向性破裂（FD）之类的现象引起的，该现象可能导致地震动速度时间历史中出现明显的脉冲。最近建立了在概率地震灾害分析（PSHA）中考虑FD的必要框架。本研究的目的是针对与FD相关的非弹性需求，讨论非线性静态程序的扩展，特别是位移系数方法（DCM）。在这种情况下，通过使用NS-PSHA的结果和NS-FD非弹性位移比的半经验方程，提出了用于实现DCM估算NS地震需求的方法。针对在Eurocode规定下设计的一组典型平面R / C框架，给出了DCM的示例性应用，其中明确包含了NS脉冲样效果。在应用中考虑了不同的场景，并获得了关于静态过程估计的非线性动态分析结果并进行了讨论。从结果得出的结论可能有助于评估将NS效应纳入PBSD的重要性。版权所有（c）2014 John Wiley＆Sons，Ltd.

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