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Modelling Behaviour of Bridge Pylon for Test Load Using Regression Analysis with Linear and Non-Linear Process

Item

Title (Dublin Core)

eng Modelling Behaviour of Bridge Pylon for Test Load Using Regression Analysis with Linear and Non-Linear Process
hrv Modeliranje ponašanja pilona mosta na probno opterećenje primjenom regresijske analize kao linearan i nelinearan proces

Description (Dublin Core)

eng This paper presents the procedure for dynamic system identification regarding behaviour of bridge pylon for test load, and the numeric example had been illustrated by examination of ''Sloboda'' bridge in Novi Sad. Since pylon shifts, occurred during test load, were long-period in nature, static GPS method had been applied for measurements. To identify dynamic process of the construction, auto-regression model with external input (ARX) had been selected. The process had been approximated as linear and non-linear. Establishing model degree had been performed by autocorrelation function and parameter significance test. It had shown that the shifts of pylon along the longitudinal axis of the bridge, occurring due to the load action, must be described as a result of non-linear process; while shifts, occurring orthogonal to longitudinal axis of the bridge, occurring due to the temperature change, are the result of linear process. Model fitting was also analyzed, observing the pylon as both rigid and deformable body. Higher percentage of fitting (alignment) had been achieved when the construction had been viewed as a deformable body.
hrv U radu je opisan postupak identifikacije dinamičkog sustava ponašanja pilona mosta na probno opterećenje, a brojčani primjer ilustriran je ispitivanjem mosta „Slobode“ u Novom Sadu. Kako su pomjeranja pilona pri probnom opterećenju dugoperiodična, za mjerenja je primijenjena statička GPS metoda. Za identifikaciju dinamičkog procesa konstrukcije izabran je autoregresijski model s vanjskim pobuđivanjem (AutoRegressive with eXternal input – ARX). Proces je aproksimiran kao linearan i nelinearan. Za utvrđivanje stupnja modela primijenjena je autokovarijacijska funkcija i test značajnosti parametara. Pokazano je da se pomjeranja pilona mosta, u smjeru duže osi, koja nastaju pod utjecajem opterećenja, moraju opisati kao rezultat nelinearnog procesa; dok su okomita pomjeranja, koja nastaju uslijed promjene temperature, rezultat linearnog procesa. Također je analizirano fitovanje modela (suglasnost) kada je pilon promatran kao kruto i kao deformatibilno tijelo. Ostvaren je veći postotak fitovanja kada je pilon promatran kao deformatibilno tijelo.

Creator (Dublin Core)

Milovanović, Branko
Mišković, Zoran
Gospavić, Zagorka
Vulić, Milivoj

Subject (Dublin Core)

eng dynamic systems identification; regression analysis; linear and non-linear process; pylon
hrv identifikacija dinamičkih sustava; regresijska analiza; linearan i nelinearan proces; pilon

Publisher (Dublin Core)

Croatian geodetic society

Date (Dublin Core)

2011

Type (Dublin Core)

text
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

Format (Dublin Core)

application/pdf

Identifier (Dublin Core)

https://hrcak.srce.hr/77842
eng https://hrcak.srce.hr/file/115601

Source (Dublin Core)

Geodetski list
ISSN 0016-710X (Print)
ISSN 1849-0611 (Online)
Volume 65 (88)
Issue 3

Language (Dublin Core)

eng

Rights (Dublin Core)

info:eu-repo/semantics/openAccess
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