Vol.7, No 1, 2009 pp. 43 - 55
UDC 624.014.2:024.075.24:64.072.22(045)
DOI: 10.2298/FUACE0901043V
EXPERIMENTAL ANALYSIS OF AN ORIGINAL TYPE OF STEEL SPACE TRUSS NODE JOINT
Todor Vacev1, Srđan Kisin2, Slobodan Ranković3
1MIN Institute Niš, Serbia, E-mail: ttomas@eunet.rs
2Faculty of Technical Sciences, Novi Sad, Serbia, E-mail: office@kkonsalting.com
3Faculty of Civil Engineering and Architecture, Niš, Serbia, E-mail: raca@gaf.ni.ac.rs
In the paper is presented experimental analysis of an original type of node joint for a steel space truss. The joint sample was loaded by spatial set of forces that simulate real condition of the structure with eight balanced member forces (4 chord and 4 diagonal members), up to structure failure. It was realized in a specially designed test facility. Tested node joint samples were made in real scale, according to the model originated after FE analysis and optimization. Basic idea was to construct and test a node joint that can be made in average technology conditions, without special tools and requirements. Besides, results of a stress-strain FE analysis are presented and comparison of the two analyses is given for the most critical regions of the node joint. Values of measured and calculated strains across model samples and characteristic measuring points are presented.
Key words: Experimental analysis, node joint, space truss, finite element analysis
EKSPERIMENTALNA ANALIZA ORIGINALNOG REŠENJA ČVORNE SPOJNICE ČELIČNE PROSTORNE REŠETKE
U radu je prikazana eksperimentalna analiza originalnog rešenja čelične čvorne spojnice prostorne rešetke. Uzorak spojnice je opterećivan prostornim rasporedom sila koji simulira realno stanje u konstrukciji sa 8 uravnoteženih sila u štapovima (4 pojasna i 4 dijagonalna štapa), sve do loma konstrukcije. Ovo je realizovano u posebno konstruisanom ispitnom ramu. Ispitivani uzorci čvorne spojnice izrađeni su u pravoj veličini, prema modelu nastalom nakon MKE analize i optimizacije. Osnovna ideja je bila da se konstruiše i ispita čvorna spojnica koja se može izraditi u prosečnim tehnološkim uslovima - bez primene posebnih alata i zahteva. Osim toga, dati su rezultati MKE naponsko-deformacijske analize i izvršena uporedna analiza rezultata u najkritičnijim zonama čvorne spojnice. Prikazane su vrednosti merenih i računskih dilatacija po uzorcima i karakterističnim mernim mestima.
Ključne reči: Eksperimentalna analiza, čvorna spojnica, prostorna rešetka, analiza konačnih elemenata.