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master's thesis
Usporedba eksperimentalnog i numeričkog modela stabilnosti tlačno opterećenog štapa spregnutog presjeka
2024. urn:nbn:hr:157:807788
Mandić, Drago
University of Rijeka
Faculty of Civil Engineering
Department of Load Bearing Structures and Technical Mechanics
Chair of Technical Mechanics

Cite this document

Mandić, D. (2024). Usporedba eksperimentalnog i numeričkog modela stabilnosti tlačno opterećenog štapa spregnutog presjeka (Master's thesis). Rijeka: University of Rijeka, Faculty of Civil Engineering. Retrieved from https://urn.nsk.hr/urn:nbn:hr:157:807788

Mandić, Drago. "Usporedba eksperimentalnog i numeričkog modela stabilnosti tlačno opterećenog štapa spregnutog presjeka." Master's thesis, University of Rijeka, Faculty of Civil Engineering, 2024. https://urn.nsk.hr/urn:nbn:hr:157:807788

Mandić, Drago. "Usporedba eksperimentalnog i numeričkog modela stabilnosti tlačno opterećenog štapa spregnutog presjeka." Master's thesis, University of Rijeka, Faculty of Civil Engineering, 2024. https://urn.nsk.hr/urn:nbn:hr:157:807788

Mandić, D. (2024). 'Usporedba eksperimentalnog i numeričkog modela stabilnosti tlačno opterećenog štapa spregnutog presjeka', Master's thesis, University of Rijeka, Faculty of Civil Engineering, accessed 23 November 2024, https://urn.nsk.hr/urn:nbn:hr:157:807788

Mandić D. Usporedba eksperimentalnog i numeričkog modela stabilnosti tlačno opterećenog štapa spregnutog presjeka [Master's thesis]. Rijeka: University of Rijeka, Faculty of Civil Engineering; 2024 [cited 2024 November 23] Available at: https://urn.nsk.hr/urn:nbn:hr:157:807788

D. Mandić, "Usporedba eksperimentalnog i numeričkog modela stabilnosti tlačno opterećenog štapa spregnutog presjeka", Master's thesis, University of Rijeka, Faculty of Civil Engineering, Rijeka, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:157:807788

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TitleUsporedba eksperimentalnog i numeričkog modela stabilnosti tlačno opterećenog štapa spregnutog presjeka
Title (english)Comparison of Experimental and Numerical Stability Models of a Compression-loaded Rod With a Coupled Cross-section
AuthorDrago Mandić
MentorDragan Ribarić (mentor)
MentorLeo Škec (komentor)
Committee memberTeo Mudrić (predsjednik povjerenstva)
Committee memberLeo Škec (član povjerenstva)
Committee memberDragan Ribarić (član povjerenstva)
GranterUniversity of Rijeka
Faculty of Civil Engineering
(Department of Load Bearing Structures and Technical Mechanics)
(Chair of Technical Mechanics)
Rijeka
Defense date and country2024-09-26, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Basic Technical Sciences
Technical Mechanics (Mechanics of Rigid and Deformable Bodies)
Abstract
U ovom diplomskom radu analizirana je stabilnosti dvodijelnog spregnutog štapa kroz eksperimentalnu, analitičku i numeričku analizu. Analizirani štap sastoji se od dvije čelične ploče međusobno povezane s dva stupca vijaka. Zbog zračnosti rupa i deformabilnosti vijaka, takvo sprezanje je popustljivo pa je potrebno ustanoviti njegovu efikasnost. Prvo je problem teorijski razrađen, definiran tip presjeka i očekivane teorijske granice kritične sile za izvijanje. Nakon toga izveden je eksperiment u kojem je štap opterećen osno u tlaku uz mjerenje sile i pomaka (osnih i poprečnih) do kojih dolazi prije i nakon što štap izgubi stabilnost. U sljedećem koraku su izrađeni geometrijski nelinearni ravninski (2D) i prostorni (3D) numerički model za simulaciju eksperimenta koji omogućava da se štap (uz početnu imperfekciju) izvije uslijed djelovanja tlačne sile. Modeli su pretpostavljali da su vijci deformabilni te da je veza između vijaka i čeličnih ploča nepopustljiva. Na kraju su rezultati eksperimenta, analitičkog proračuna i numeričkih simulacija međusobno uspoređeni radi provjere točnosti i pouzdanosti modela. Ustanovljeno je da zbog nepredviđenih pomaka uzorka tijekom ispitivanja i slabijeg stvarnog stupnja sprezanja od onog predviđenog modelom dolazi do određenih odstupanja analitičkog proračuna i numeričkih modela u odnosu na eksperiment.
Abstract (english)
This thesis analyzes the stability of a two-part composite column through experimental, analytical, and numerical approaches. The analyzed column consists of two steel plates connected by two rows of bolts. Due to the clearance in the bolt holes and the deformability of the bolts, such a connection is flexible, and its efficiency needs to be determined. First, the problem is theoretically addressed, defining the cross-section type and the expected theoretical limits of the critical buckling force. Following that, an experiment was conducted where the column was subjected to axial compression, with measurements of force and displacement (both axial and lateral) taken before and after the column loses stability. In the next step, geometrically nonlinear planar (2D) and spatial (3D) numerical models were developed to simulate the experiment, allowing the column (with an initial imperfection) to buckle under compressive force. The models assumed that the bolts were deformable and that the connection between the bolts and the steel plates was rigid. Finally, the results of the experiment, analytical calculations, and numerical simulations were compared to verify the accuracy and reliability of the models. It was found that, due to unforeseen displacements of the sample during testing and a lower actual degree of connection than that predicted by the model, there were certain discrepancies between the analytical calculations, numerical models, and the experiment.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:157:807788
Study programmeTitle: University graduate study of Civil Engineering; specializations in: Geotechnical Engineering, Hydraulic Engineering, Engineering Modelling of Structures, Structures, Transportation Engineering, Urban Engineering
Course: Structures
Study programme type: university
Study level: graduate
Academic / professional title: sveučilišni magistar inženjer građevinarstva/sveučilišna magistra inženjerka građevinarstva (sveučilišni magistar inženjer građevinarstva/sveučilišna magistra inženjerka građevinarstva)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
Terms of useLicence In copyright icon
Created on2024-11-19 10:15:09