Problem stabilnosti stupova

undergraduate thesis

• Title (english): Column Stability Problem
• Author: Nikola Oreb
• Mentor: Marko Bartolac (mentor)
• Committee member: Diana Šimić Penava (predsjednik povjerenstva)
• Committee member: Marko Bartolac (član povjerenstva)
• Committee member: Marina Frančić Smrkić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Civil Engineering; (Engineering Mechanics); Zagreb
• Defense date and country: 2023-09-26, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract

Predmet ovog završnog rada je analiza gubitka stabilnosti stupova opterećenih tlačnom silom uslijed izvijanja. Prilikom analize čeličnih vruće valjanih IPE profila promatran je utjecaj imperfekcije štapa (početna zakrivljenost) i ekscentričnost opterećenja na pojavu izvijanja. Parametarska analiza dovela je do zaključka da imperfekcije štapa i opterećenja imaju značajan utjecaj na kritičnu silu, koja se porastom vrijednosti imperfekcija može smanjiti i oko 50 %. Zatim se promatralo kako se ugradnjom jedne ili više bočnih stabilizacija povećava krutost IPE profila u slabijoj glavnoj ravnini. Na temelju provedenih analiza za različite duljine izvijanja i položaje bočnih stabilizacija, uočen je trend da IPE profilima većih dimenzija bočna stabilizacija treba biti postavljena na manjem razmaku kako bi se dobile približno jednake kritične sile u obje glavne ravnine. Rad nadalje prikazuje smjernice dimenzioniranja elemenata na izvijanje koje su popraćene riješenim primjerima dimenzioniranja zglobno učvršćenih štapova. Na temelju provedenih parametarskih analiza i dobivenih grafova dani su zaključci o ponašanju čeličnih IPE profila koji su izloženi izvijanju.

Abstract (english)

The subject of this paper is the analysis of the loss of stability of columns loaded with compressive force due to buckling. In the analysis of hot-rolled steel IPE sections, the influence of the imperfection of the bar (initial curvature) and the eccentricity of the load on the occurrence of buckling was observed. The parametric analysis led to the conclusion that bar and load imperfections have a significant influence on the critical force, which can be reduced by about 50% with an increase in the value of the imperfections. It was then observed how the stiffness of the IPE profile in the weaker plane increases with the installation of one or more lateral stabilisations. Based on the analyses performed for different buckling lengths and positions of the lateral stabilisation, a trend was found that for IPE sections with larger dimensions, the lateral stabilisation should be placed at a smaller distance to obtain approximately equal critical forces in both main planes. The paper also provides guidelines for the design of elements subject to buckling, accompanied by solved examples for the design of articulated bars. Based on the parametric analyses carried out and the diagrams obtained, conclusions were drawn about the behaviour of IPE steel sections at risk of buckling.

• Keywords: stup; stabilnost; izvijanje; tlačna sila
• Keywords (english): column; stability; buckling; compressive force
• Language: croatian
• URN:NBN: urn:nbn:hr:237:066641
• Study programme: Title: Civil Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka građevinarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka građevinarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-10-24 09:18:02