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Resistance model uncertainty in non-linear finite element analyses of cyclically loaded reinforced concrete systems

机译：循环装载钢筋混凝土系统非线性有限元分析的电阻模型不确定性

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摘要

This study assesses the partial safety factor corresponding to the resistance model uncertainties in the use of nonlinear finite element analyses (NLFEAs) for reinforced concrete systems subjected to cyclic loads. Specifically, various walls experimentally tested are considered for this investigation and are simulated through two-dimensional (i.e., plane stress) finite element (NLFE) models. The comparison between the global resistances from the plane stress NLFE structural models and the experimental tests is carried out considering the possible modelling hypotheses available in relation to the mechanical response of reinforced concrete structural systems subjected to cyclic loads. After that, a probabilistic processing of the abovementioned epistemic uncertainties is carried out in line with a Bayesian updating. In detail, each prior distribution of the resistance model uncertainty related to a specific combination of the modelling hypotheses is computed and successively updated with the data achieved from the other models to estimate the posterior distribution. Hence, the coefficient of variation and the mean value of the resistance model uncertainties are evaluated and the corresponding partial safety factor is assessed in line with the NLFEA safety formats of reinforced concrete systems for seismic analyses.
机译：该研究评估了对对应于使用循环负荷的钢筋混凝土系统的非线性有限元分析（NLFEAS）的电阻模型不确定性对应的部分安全系数。具体地，考虑通过二维（即平面应力）有限元（NLFE）模型来模拟实验测试的各种壁。考虑到与经过循环负荷的钢筋混凝土结构系统的机械响应有关的可能造型假设，对来自平面应力NLFE结构模型的全局电阻与实验测试之间的比较。之后，通过贝叶斯更新进行上述认知不确定因素的概率处理。详细地，计算与建模假设的特定组合相关的电阻模型不确定性的每个先前分布，并连续地利用从其他模型实现的数据来估计后部分布。因此，评估变形系数和电阻模型不确定性的平均值，并根据用于地震分析的钢筋混凝土系统的NLFEA安全格式来评估相应的部分安全系数。

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