Vol.9, No 3, 2011 pp. 367 - 378
UDC
624.071.34=111
DOI: 10.2298/FUACE1103367B
EXPERIMENTAL - THEORETICAL STUDY OF AXIALLY COMPRESSED COLD FORMED STEEL PROFILES
Miroslav Bešević*, Danijel Kukaras
Faculty of Civil Engineering Subotica, University of Novi Sad, Serbia
E-mail: *miroslav.besevic@gmail.com
Analysis of axially compressed steel members made of cold formed profiles presented in this paper was conducted through both experimental and numerical methods. Numerical analysis was conducted by means of "PAK" finite element software designed for nonlinear static and dynamic analysis of structures. Results of numerical analysis included ultimate bearing capacity with corresponding middle section force-deflection graphs and buckling curves. Extensive experimental investigation were also concentrated on determination of bearing capacity and buckling curves. Experiments were conducted on five series with six specimens each for slenderness values of 50, 70, 90, 110 and 120. Compressed simply supported members were analyzed on Amsler Spherical pin support with unique electronical equipment and software. Besides determination of force-deflection curves, strains were measured in 18 or 12 cross sections along the height of the members. Analysis included comparisons with results obtained by different authors in this field recently published in international journals. Special attention was dedicated to experiments conducted on high strength and stainless steel members.
Key words:
axially compressed members, experimental analysis, numerical analysis, finite element method, buckling curves, carbon steel, cold formed profiles, stainless steel, high-strength steel.
EKSPERIMENTALNO-NUMERIČKA STUDIJA NOSIVOSTI CENTRIČNO PRITISNUTIH ŠTAPOVA OD HLADNOOBLIKOVANIH ČELIČNIH PROFILA
Analiza rezultati numeričke simulacije su granična sila, odgovarajuća pomeranja-ugibi štapa sredine uzorka i krive izvijanja štapova. Sprovedena su i obimna eksperimentalna ispitivanja nosivosti štapova pri izvijanju. Eksperimentalna ispitivanja nosivosti obuhvatila su pet serija od šest uzoraka sa vrednostima vitkosti 50, 70, 90, 110 i 120. Pritisnuti prosti štapovi analizirane su kroz Amsler testove u kojima su korišćeni sferni oslonci. Korišćena je nova elektronska oprema i originalni softveri. Pored merenja nosivosti i deformacija beleženi su i rezultati istezanja u 18 do 20 tačaka duž poprečnog preseka.
Analizirani su i rezultati najnovija istraživanja različitih autora iz ove oblasti za visokovredne i nerđajuće čelike i izvršena su poređenja.
Ključne reči:
pritisnuti štapovi, eksperimentalna analiza, numerička analiza, metod konačnih elemenata, krive izvijanja, čelik, hop-profili, nerđajući čelik, čelik visoke čvrstoće
