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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Comparison of fully non-stationary artificial accelerogram generation methods in reproducing seismicity at a given site
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Comparison of fully non-stationary artificial accelerogram generation methods in reproducing seismicity at a given site

机译：在给定地点再现地震活动时完全非平稳人工加速度计生成方法的比较

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摘要

Seismic input modelling is a crucial step when Non-Linear Time-History Analyses (NLTHAs) are performed, the seismic response of structures being highly responsive to the input employed. When natural accelerograms able to represent local seismicity are not available, the use of generated accelerograms is an efficient solution for input modelling. The aim of the present paper is to compare four methods for generating fully non-stationary artificial accelerograms on the basis of a target spectrum, identified using seven recorded accelemgrams registered in the neighbourhood of the construction site during a single event, assumed as target accelerograms. For each method, seven accelerograms are generated and used to carry out NLTHAs on three RC structures, having irregular mass and stiffness distributions. The generation methods are evaluated in terms of both input modelling and seismic response of three RC structures. The results point out that maximum interstorey drift ratios are well reproduced only by generation methods based on spectrum-compatible criterion, while energy contained by the target set is only simulated by methods based on records of natural signals. Moreover, none of the method here investigated is able to reproduce the hysteretic energy dissipated by the structures subjected to the target accelerograms, in terms of both total amount and cumulative trend over the duration.
机译：进行非线性时程分析（NLTHA）时，地震输入建模是至关重要的一步，结构的地震响应对所使用的输入具有高度的响应能力。当没有能够表示局部地震活动性的自然加速度图时，使用生成的加速度图是输入建模的有效解决方案。本文的目的是比较四种基于目标频谱生成完全非平稳人工加速度图的方法，该方法使用在一次事件中在建筑工地附近注册的七个记录的加速度图来识别，并假定为目标加速度图。对于每种方法，将生成七个加速度图，并用于在三个具有不规则质量和刚度分布的RC结构上执行NLTHA。根据三个RC结构​​的输入建模和地震响应对生成方法进行了评估。结果表明，最大层间漂移比只能通过基于频谱兼容准则的生成方法来很好地再现，而目标集所包含的能量只能通过基于自然信号记录的方法来模拟。而且，在此研究的方法中，没有一种方法能够在持续时间内通过总量和累积趋势来再现由经受目标加速度图的结构所耗散的磁滞能量。

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