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Seismic reliability assessment and the nonergodicity in the modelling parameter uncertainties
Earthquake Engineering & Structural Dynamics ( IF 4.5 ) Pub Date : 2020-01-10 , DOI: 10.1002/eqe.3247
Fatemeh Jalayer 1 , Hossein Ebrahimian 1
Affiliation  

Modelling uncertainty can significantly affect the structural seismic reliability assessment. However, the limit state excursion due to this type of uncertainty may not be described by a Poisson process as it lacks renewal properties with the occurrence of each earthquake event. Furthermore, considering uncertainties related to ground motion representation by employing recorded ground motions together with modelling uncertainties is not a trivial task. Robust fragility assessment, proposed previously by the authors, employs the structural response to recorded ground motion as data in order to update prescribed seismic fragility models. Robust fragility can be extremely efficient for considering also the structural modelling uncertainties by creating a dataset of one‐to‐one assignments of structural model realizations and as‐recorded ground motions. This can reduce the computational effort by more than 1 order of magnitude. However, it should be kept in mind that the fragility concept itself is based on the underlying assumption of Poisson‐type renewal. Using the concept of updated robust reliability, considering both the uncertainty in ground motion representation based on as‐recorded ground motion and non ergodic modelling uncertainties, the error introduced through structural reliability assessment by using the robust fragility is quantified. It is shown through specific application to an existing RC frame that this error is quite small when the product of the time interval and the standard deviation of failure rate is small and is on the conservative side.

中文翻译:

地震可靠性评估和建模参数不确定性中的非遍历性

建模不确定性会严重影响结构抗震可靠性评估。但是,由于这种不确定性导致的极限状态偏移可能无法通过泊松过程来描述,因为它在每次地震事件发生时都缺乏更新特性。此外,通过采用记录的地面运动和建模不确定性来考虑与地面运动表示有关的不确定性并不是一件容易的事。作者先前提出的稳健脆性评估将对记录的地震动的结构响应用作数据,以更新规定的地震脆性模型。通过创建结构模型实现和记录的地面运动的一对一分配的数据集,鲁棒的脆弱性对于考虑结构建模的不确定性也可以非常有效。这样可以将计算工作量减少1个数量级以上。但是,应该记住,脆弱性概念本身是基于泊松型更新的基本假设。使用更新的鲁棒可靠性的概念,同时考虑基于实地记录的地面运动表示的不确定性和非遍历模型的不确定性,对通过使用鲁棒脆弱性进行结构可靠性评估而引入的误差进行了量化。通过对现有RC框架的具体应用表明,当时间间隔与故障率标准偏差的乘积较小且在保守方面时,该误差非常小。应当牢记,脆弱性概念本身是基于泊松型更新的基本假设。使用更新的鲁棒可靠性的概念,同时考虑基于实地记录的地面运动表示的不确定性和非遍历模型的不确定性,对通过使用鲁棒脆弱性进行结构可靠性评估而引入的误差进行了量化。通过对现有RC框架的具体应用表明,当时间间隔与故障率标准偏差的乘积较小且在保守方面时,该误差非常小。应当牢记,脆弱性概念本身是基于泊松型更新的基本假设。使用更新的鲁棒可靠性概念,考虑基于实地记录的地面运动表示的不确定性和非遍历模型的不确定性,对使用鲁棒脆弱性通过结构可靠性评估引入的误差进行了量化。通过对现有RC框架的具体应用表明,当时间间隔与故障率标准偏差的乘积较小且在保守方面时,该误差非常小。考虑到基于已记录的地面运动的地震动表示的不确定性和非遍历模型的不确定性,对通过使用鲁棒脆弱性进行结构可靠性评估而引入的误差进行了量化。通过对现有RC框架的具体应用表明,当时间间隔与故障率标准偏差的乘积较小且在保守方面时,该误差非常小。考虑到基于已记录的地面运动的地震动表示的不确定性和非遍历模型的不确定性,对通过使用鲁棒脆弱性进行结构可靠性评估而引入的误差进行了量化。通过对现有RC框架的具体应用表明,当时间间隔与故障率标准偏差的乘积较小且在保守方面时,该误差非常小。
更新日期:2020-03-04
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