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Assessment of the seismic non-linear behavior of ductile wall structures due to synthetic earthquakes

机译：合成地震对延性墙结构地震非线性行为的评估

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摘要

In this paper, different methods for generating synthetic earthquakes are compared in terms of related non-linear seismic response of ductile structures. The objective of the investigation is to formulate recommendations for the use of synthetic earthquakes for reliable seismic analysis, The comparison is focused on the accuracy of the reproduction of the characteristics of the structural non-linear response due to recorded earthquakes. First the investigations are carried out for non-linear single-degree-of-freedom systems. Later, the results are validated for a set of realistic buildings modelled as multi-degree-of-freedom systems. Various options of the classical stationary simulation procedure of SIMQKE and a non-stationary simulation procedure proposed by Sabetta and Pugliese are examined and compared. The adopted methodology uses a set of recorded earthquakes as a reference. Hundred synthetic accelerograms are generated for each examined simulation option with the condition that the related elastic responses are similar to those of the reference set. The nonlinear single-degree-of-freedom systems are defined using six recognized hysteretic models and four levels of increasing non-linearity. The non-linear responses computed for the reference set and the studied simulation options are then statistically compared in terms of displacement ductility and energy. The results show that the implementation of the classical stationary procedure always leads to a significant underestimation of the ductility demand and a significant overestimation of the energy demand. By contrast, non-stationary time histories produce much better results. The results with the multi-degree-of-freedom systems are shown to confirm these conclusions.
机译：在本文中，根据延性结构的相关非线性地震响应，比较了产生合成地震的不同方法。研究的目的是为合成地震的使用制定可靠的地震分析建议。比较的重点是记录地震引起的结构非线性响应特征再现的准确性。首先，对非线性单自由度系统进行了研究。后来，对一组建模为多自由度系统的现实建筑的结果进行了验证。对SIMQKE的经典平稳仿真程序以及Sabetta和Pugliese提出的非平稳仿真程序的各种选项进行了检查和比较。所采用的方法以一组记录的地震为参考。对于每个检查的模拟选项，都会产生一百个合成加速度图，条件是相关的弹性响应与参考集的相似。非线性单自由度系统使用六个公认的磁滞模型和四个级别的非线性增量进行定义。然后根据位移延展性和能量统计比较为参考集和研究的模拟选项计算出的非线性响应。结果表明，经典平稳过程的实施总是导致延性需求的显着低估和能量需求的显着高估。相比之下，非平稳时间历史记录会产生更好的结果。多自由度系统的结果证明了这些结论。

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