Case studies of structural natural frequencies assessment and application in SHM and the calibration of FEM models

Scientific paper - Original scientific paper

• Author: Davor Uglešić
• Author: Ante Uglešić
• Author's institution: University of Zagreb; Faculty of Civil Engineering
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract (english)

In this paper, we will present the equipment and method by which we assess the natural
frequencies on site. The data motivated us to start estimating the eigenfrequencies of structures
and apply the results to calibrate FEM models. Several case studies will be presented in which
the calibration method of FEM models via structural natural frequencies identified onsite were
applied. The application of this method is very useful during the assessment of the safety of
existing buildings and the design of their renovation, reinforcement or rehabilitation. FEM
programs with very high possibilities of static and dynamic analysis of structures in the linear and
nonlinear field are in use now. We can expect reliable analysis results from a well-calibrated model.
Calibration is required to make the model, which includes, at least indirectly, any imperfection that
exists in the structure, and which cannot be registered in any other way. Our experience with
low-rise structures with great stiffness will be compared with the published experience of other
authors. The possibilities of structural health monitoring will be shown also, by comparing the
natural frequencies obtained by measurements at different times: before, during and after the
structural rehabilitation. This method is not omnipotent, therefore, except for the advantages, we
shall show limitations of method related to the type of structure, weather conditions and other.
In second part we shall present some case studies from the literature. In order to motivate the
owners, as well as the fellow designers, at the end some accidents that may have been avoided if
this or other SHM methods had been used will be shown

• Keywords (english): microtremors, natural frequencies, structural health monitoring, FEM, calibration
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Unknown
• Publication version: Published version
• Publication title: 1st Croatian Conference on Earthquake Engineering 1CroCEE
• Numbering: pp. 1345-1356
• p-ISSN: 3043-8071
• DOI: https://doi.org/10.5592/CO/1CroCEE.2021.200
• URN:NBN: urn:nbn:hr:237:804176
• Publication: 2021-03
• Conference: Title: st Croatian Conference on Earthquake Engineering; Location: Zagreb, Croatia; Start date: 2021-03-22; End date: 2021-03-24; Assembly type: Lecture
• Type of resource: Text
• Publisher: Sveučilište u Zagrebu Građevinski fakultet
• Access conditions: Open access
• Created on: 2024-08-30 07:57:22