Experimental analysis of an original type of steel space truss node joint

Abstract

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

Mathematical modeling of materially nonlinear problems in structural analyses, Part II: Application in contemporary software

“…On the basis of [8] and [9] for tangent modulus of elasticity of bilinear-kinematic model of steel adopted:…”

New Experimental Results of the Research on Reinforced Node in Space Truss

“…In Brazil, the most widely connection utilized in 3D trusses is the staking flattened-end connection (also known as typical connection, Figure 4) and the steel node ( Figure 5). Vacev's research [7] presented experimental analysis of the steel node. The joint was loaded by spatial set of forces that simulate real condition of the structure.…”

“…Figure 5. Steel Node [7] The advantages of the flattened-end connection ( Figure 4) are price and installation time compared to the steel node ( Figure 5). However, such connection (Typical Flattened-end) has disadvantages like eccentricities and stiffness weakening of the tubular members.…”