Operational modal analysis and finite element model correlation of the Braga Stadium suspended roof

2008 ◽  
Vol 30 (6) ◽  
pp. 1688-1698 ◽  
Author(s):  
Filipe Magalhães ◽  
Elsa Caetano ◽  
Álvaro Cunha
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Element Model ◽  
Operational Modal Analysis ◽  
Model Correlation ◽  
Suspended Roof

Comparing Measured Responses of an Offshore Structure with Operational Modal Analysis assisted Classical Model Approach

2020 ◽  
pp. 1-10
Author(s):  
Bruna Nabuco ◽  
Sandro D. Amador ◽  
Evangelos I. Katsanos ◽  
Ulf T. Tygesen ◽  
Erik Damgaard Christensen ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Element Model ◽  
Operating Conditions ◽  
Operational Modal Analysis ◽  
Mode Shapes ◽  
Wave Forces ◽  
Wave Load ◽  
Offshore Structure

Abstract Aiming to ensure the structural integrity of an offshore structure, wave-induced responses have been measured during normal operating conditions. Operational Modal Analysis is applied to the data obtained from continuously monitoring the structure. Sensors placed only on the topside of an offshore platform are sufficient to provide information to identify the modal properties of the structure, such as natural frequencies, damping ratios, and mode shapes. A finite element model is created and updated in line with the identified dynamic properties for applying a modal expansion technique in the interest of accessing information at any point of the structure. Wave radars are also placed at the platform from which the wave forces are calculated based on basic industrial standard models. In this way, the wave kinematics are estimated according to the linear wave theory associated with Wheeler stretching. Since this study is related to offshore structures composed by slender elements, the wave forces are estimated using Morison formulation. By assigning typical values to the drag and inertia coefficients, wave loads are estimated and applied to the updated finite element model. For the diffraction effect, the wave load has also been evaluated according to MacCamy and Fuchs theory. The responses obtained from this procedure are compared with measured responses. In addition to describing the process, this paper presents a case study to verify the theory using monitoring data from a tripod jacket. Results indicate realistic response estimation that contributes to the knowledge about the state of the structure.

Operational modal analysis and finite element model updating of a 230 m tall tower

Structures ◽  
2022 ◽  
Vol 37 ◽  
pp. 154-167
Author(s):  
Onur Avci ◽  
Khalid Alkhamis ◽  
Osama Abdeljaber ◽  
Anas Alsharo ◽  
Mohammed Hussein
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Model Updating ◽  
Element Model ◽  
Operational Modal Analysis ◽  
Finite Element Model Updating ◽  
Tall Tower

scholarly journals Operational Modal Analysis, Model Update and Fragility Curves Estimation, through Truncated Incremental Dynamic Analysis, of a Masonry Belfry

Buildings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 120
Author(s):  
Ilaria Capanna ◽  
Riccardo Cirella ◽  
Angelo Aloisio ◽  
Rocco Alaggio ◽  
Franco Di Fabio ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Seismic Analysis ◽  
Fragility Curves ◽  
Element Model ◽  
Operational Modal Analysis ◽  
Analysis Model ◽  
Ground Acceleration ◽  
Masonry Towers

Masonry towers, located in seismic zones, are vulnerable and prone to damages up to compromise their stability. The scatter of data on the mechanical properties of masonry, geometry and boundary conditions determine a lack of building knowledge on their expected behaviour. Therefore the assessment of the seismic capacity represents a critical task. This paper contributes to the issue of seismic analysis of masonry towers, focusing a meaningful case study: the St.Silvestro belfry in L’Aquila, Italy. The tower, severely damaged by the 2009 earthquake sequence, underwent extensive restoration works, endeavoured to mitigate its vulnerability. The observed seismic damage, the performed no-destructive testing campaign and the accomplished rehabilitation measures are described in the paper. The authors appraised the actual seismic performances of the St.Silvestro belfry, reinforced by the last restoration works. At first, the Operational Modal Analysis (OMA) is carried out to enhance building knowledge. In a second step, a refined finite element model is calibrated on the results from OMA to seize the actual dynamic response. Ultimately, by using the updated finite element model, the authors estimate the fragility curves in terms of peak ground acceleration using truncated incremental dynamic analyses.

Operational Modal Analysis and Finite-Element Model Updating of Pilot Concrete Wind Turbine Tower

2019 ◽  
Vol 145 (2) ◽  
pp. 05018003
Author(s):  
Edilson Alexandre Camargo ◽  
Jens Peder Ulfkjaer ◽  
Rune Brincker ◽  
Jens Nøergaard ◽  
Simon Steen Gadegaard
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Model Updating ◽  
Element Model ◽  
Operational Modal Analysis ◽  
Finite Element Model Updating ◽  
Wind Turbine Tower
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