Bayesian updating of tall timber building model using modal data

Kurent, Blaž (author), Friedman, Noemi (author), Ao, Wai Kei (author), Brank, Boštjan (author)

A framework for the probabilistic finite element model updating based on measured modal data is presented. The described framework is applied to a seven-storey building made of cross-laminated timber panels. The experimental estimates based on the forced vibration test are used in the process of model updating. First, a generalized Polynomial Chaos surrogate model is derived representing the map from the model parameters to the eigenfrequencies and the eigenvectors. To overcome the difficulties caused by mode switching, we propose a novel approach to mode tracking based on partitioning an extended and low-rank representation of the k mode shapes resulting from different setups of the finite element model into k clusters by the k-means clustering algorithm. Second, the surrogate model derived with the help of mode pairing is used to efficiently perform sensitivity analysis and uncertainty quantification of the first five frequencies and the correspon ding mode shapes. Finally, the surrogate-based Bayesian update of the model parameters is efficiently performed, providing engineers not only with a finite element model that gives a good fit to the experimental modal data, but also a stochastic model that represents the uncertainties originating from the initial model and the uncertainties of measuring modal properties.

• Language: English
• Keywords: Bayesian model updating, tall CLT building, Polynomial Chaos surrogate, Uncertainty quantification, mode pairing, modal data
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: 15 str.
• Numbering: Vol. 266, art. 114570
• PID: 20.500.12556/RUL-138559
• UDC: 624.011.1:624.07
• ISSN on article: 0141-0296
• DOI: 10.1016/j.engstruct.2022.114570
• COBISS.SI-ID: 115033603
• Publication date in RUL: 27.07.2022

Record is a part of a journal

• Title: Engineering structures
• Shortened title: Eng. struct.
• Publisher: Elsevier
• ISSN: 0141-0296
• COBISS.SI-ID: 7750666

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: Bayesovo posodabljanje modela, visoka lesena stavba, surogat na podlagi polinomičnega kaosa, kvantifikacija negotovosti, podobnost modalnih oblik, modalne karakteristike