基于Kriging模型的结构震害预估方法研究

STUDY ON THE METHOD OF STRUCTURAL SEISMIC DAMAGE PREDICTION BASED ON KRIGING SURROGATE MODEL

  • 摘要: 提出了针对泸定县某博物馆多层框架结构的基于Kriging模型的结构震害预估方法,并根据在2022年9月5日发生的泸定6.8级地震中该多层框架结构出现的震害,对提出的震害预估方法进行了验证。基于Kriging模型的结构震害预估方法具体流程方法如下:建立结构的有限元模型;选用能够代表结构所在场地特性的近断层地震动记录进行弹塑性时程分析;根据时程分析得到的基底剪力、位移数据训练Kriging模型,并得到结构的抗震能力曲线;根据时程分析输入的多元地震动参数和基底剪力、位移数据训练Kriging模型,并结合LASSO正则化方法和K-means聚类算法得到结构的抗震需求Kriging模型;基于抗震能力曲线定义结构的震害评价标准,根据抗震需求Kriging模型和潜在地震的地震动参数对结构进行震害预估。研究结果表明:当采用300个训练数据时,基于Kriging模型的震害预估方法能够满足工程需求,可以作为HAZUS法改进的参考;在数据有限的情况下,特征选择方法可以提高Kriging模型的准确性,但K-means聚类算法并不能有效的提高结果的准确性;训练数据获取成本较高是Kriging模型在结构抗震领域应用的限制因素。

     

    Abstract: A structural damage prediction method based on the Kriging surrogate model was proposed for a multi-storey frame structure of a museum in Luding. The method proposed was validated upon the seismic damage of the multi-storey frame structure in the Luding Ms6.8 earthquake that occurred on September 5, 2022. The specific process and method of structural seismic damage prediction based on the Kriging surrogate model are as follows: Establishing a finite element model of the structure; Selecting near-fault seismic motion records that can represent the characteristics of the site where the structure is located for elastic-plastic time history analysis; Training the Kriging surrogate model by the base shear and by displacement data obtained from time-history analysis to obtain the seismic capacity curve of the structure; Combining with LASSO regularization method and K-means clustering algorithm, and training the Kriging surrogate model by the input multiple seismic parameters, by the base shear and, by the displacement data from time-history analysis to obtain the seismic demand Kriging surrogate model of the structure; According to the seismic capacity curve, defining the seismic damage evaluation criteria for the structure, and estimating the seismic damage of the structure based on the seismic demand Kriging surrogate model and, on potential seismic motion parameters. The research results indicate that: When using 300 sets of training data, the earthquake damage prediction method based on the Kriging surrogate model can meet engineering requirements and serve as a reference for improving the HAZUS method; In the case of limited data, feature selection methods can improve the accuracy of the Kriging surrogate model, but the K-means clustering algorithm cannot effectively improve the accuracy of the results; The high cost of obtaining training data is a limiting factor for the application of Kriging surrogate models in the field of structural seismic analysis.

     

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