Naslov
Analysis of a simple model for inverse estimation of material parameters from three-point bending of beams

Autori
Kožar, Ivica ; Sulovsky, Tea ; Plovanić, Marina

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
10th International Congress of Croatian Society of Mechanics, Book of Abstracts / - : Hrvatsko društvo za mehaniku (HDM), 2022, 165-166

Skup
10th International Congress of Croatian Society of Mechanic (ICCSM 2022)

Mjesto i datum
Pula, Hrvatska, 28.09.2022. - 30.09.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Three-point beam bending ; fiber reinforced concrete ; mathematical model ; parameter estimation

Sažetak
Laboratory experiments provide us with a large amount of data, and estimation of properties and parameters from measurements is becoming increasingly important. Usually, the data are linked to a mathematical model that must establish the appropriate connections between the parameters. The mathematical model is based on simple beam theory and a fractured cross section discretized into layers [1]. The material behavior is different in tension and compression. The material behavior of concrete and steel is related in the equilibrium equations - the force balance and the the moment balance. At this stage of development, we perform only a parametric analysis ; the optimal parameters are determined by testing from a set of solutions. Further work would involve an inverse procedure for parameter estimation, similar to [1] and [1]. Three beams of each type were tested ; dimensions were 70 x 70 x 280 mm with 210 mm span between supports, without and with steel fibers. For the beams with fibers, several steel fibers were placed in a row in the notch. The bending tests were performed with a servo-controlled hydraulic machine in the laboratory of the Faculty of Civil Engineering in Rijeka. The resulting force-displacement curve was recorded until the failure of the beam, i.e. until a deflection of at least 3 mm, in order to determine the post-peak behavior. During the experiments, we recorded three parameters in the middle cross section of the tested beam: Deflection, Crack Opening Deflection (CMOD) and the loading force. All data are recorded together with the magnitude of the time step. We perform a verification of the model using a parametric analysis. At this stage, it is important that we obtain numerical results that are mathematically similar to the experimental data. Further work will include appropriate inverse methods to estimate the relevant parameters.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo, Temeljne tehničke znanosti

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