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

Freitas, Cleirton; Bezerra, Luciano Mendes; Araújo, Rafael; Sousa, Emanuel; Araújo, Geverson; Bezerra, Édipo

doi:10.18057/ijasc.2017.13.1.2

Cited by 5 publications

(7 citation statements)

References 9 publications

(15 reference statements)

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“…12 exemplifies the simulation step previously described. For the stress analysis carried out in this study, the von Mises equivalent stress criterion was adopted as a reference, given its wide applicability in the steel structures' field [3,5,[34][35][36]. Due to the ideal conditions pertinent to the numerical modeling process, it appears that the results obtained represent an upper limit of critical load when designing bars with stamped ends.…”

Section: Resultsmentioning

confidence: 99%

“…Despite this fact, some of its critical features, such as potential bending moments generated by eccentricity in the connections and the reduced rigidity due to the flattening process, must be duly considered in the designing process Silva et al [3]. It is imperative to establish specific normative criteria that provide an efficient and safe application of this type of structural element Freitas et al [4][5]. Fig.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of isolated end-flattened steel bars under compression in space trusses

Cruz

Bezerra

Silva

et al. 2022

Frattura Ed Integrità Strutturale

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This research aims to characterize the behavior of isolated end-flattened steel bars under compressive loading, in which global instabilities or excessive local deformations represent a significant part of the causes of structural collapse. The association of numerical analyses using the finite element method (FEM) with previously collected experimental data is performed, and their respective results are the core object of critical analysis in this work. Numerical simulations are based on the modified Riks method, complemented in part by modal analysis, whose results demonstrate the occurrence of the aforementioned failure modes in prototypes with slenderness ratios varying in the spectrum from 20 to 200. Finally, the analytical formulations that describe the phenomenon from the approach of global and local instabilities incorporated into current normative expressions are applied in a comparison with the results gathered in the numerical approach.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical analysis of isolated end-flattened steel bars under compression in space trusses

Cruz

Bezerra

Silva

et al. 2022

Frattura Ed Integrità Strutturale

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“…Trabalhos anteriores com distanciadores mostraram-se eficazes (Freitas, 2008) e (Freitas et al, 2016), (Silva et al, 2018 Diâmetro do Espaçador: 85 mm com altura de 25 mm Diâmetro do Parafuso com ø 10 mm de alta resistência Placa de aço de reforço: 100x100mm ASTM A 36 Diâmetro de todos os tubos em aço 1020 com ø 38 mm Comprimento da estampagem da barra de 120 mm Figura 7 -Detalhe da Conexão com distanciador para correção da excentricidade…”

Section: Características Dos Protótiposunclassified

“…Figura 11 -Processo construtivo dos distanciadores de polímero reforçado com fibra de sisal, (Freitas et al, 2016) 4 Ensaios Experimentais Figura 12 -Elementos distanciadores submetidos à força de compressão 0,00 1,00 2,00 3,00 4,00 5,00 6,00 7,00 8,00 9,00 10,00 130,00 0,00 1,00 2,00 3,00 4,00 5,00 6,00 7,00 8,00 9,00 10,00…”

Section: Materiais Utilizados Nos Protótiposunclassified

Análise experimental de treliça tridimensional com correção da excentricidade na ligação estampada usando espaçadores de aço e com polímero reforçado com fibra de sisal

Silva¹,

Bezerra²,

Freitas³

et al. 2019

REA

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Experimental analysis of spatial trusses with eccentricity correction on stamped connection using spacers of steel, sisal fiber reinforced polymer ResumoOs sistemas de treliças tridimensionais, desenvolvidos na Europa e nos Estados Unidos a partir da 2º Guerra Mundial, surgiram como uma excelente possibilidade estrutural para cobertura de grandes vãos livres. A limitação quanto ao uso dessas estruturas estão relacionadas principalmente à fragilidade dos nós, especificamente os classificados de nós típicos devido à excentricidade gerada pela ligação estampada. Diante disso, foi executado seis protótipos de treliças espaciais com dimensões de 9 x 6 m, com correção da ligação típica por meio de dois elementos distanciadores, aço e sisal. Os ensaios experimentais mostraram que os distanciadores aumentam aproximadamente 48% a capacidade resistente da estrutura, evitando principalmente o colapso na ligação. De modo que, nos protótipos com distanciadores o colapso aconteceu por flambagem das barras.

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“…The analytical procedure indicates the importance of studies on the real behavior of elements under compression due to the instability of the connection, and for some types of nodes, the buckling coefficient of the bars can exceed 1.3. Souza 2003, Andrade, et al 2005, Bezerra, et al 2009, Freitas, et al 2013and Freitas, et al 2017 analysed the structural behavior of steel space structures using flattened-ends hollow sections and evaluated the use of structural reinforcements in order to increase the resistant capacity of the structures. Some of them showed favorable behavior, others, on the other hand, did not achieve the purpose of reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of truss systems with stiffened flattened end-bars

Mazon

Sarmanho

Nunes

et al. 2018

Lat. Am. j. solids struct.

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Circular hollow sections are usually used in long-span roof truss systems. One of the typology for connecting elements in such structures involves the flattening of bar ends. This article presents the numerical analysis of a plane truss composed of circular hollow sections, in which diagonal bars have flattened ends. In this sense, a new flattening typology called stiffened flattening is proposed, characterized by a non-flat geometry, with the creation of stiffeners in the lateral edges of the diagonal flattened ends. The diagonal connecting system with the chord members uses connecting plates. The plates are welded to the chords and the diagonals are connected to latter through a single bolt. The numerical analysis using finite elements method was developed in two stages through ANSYS software with the Parametric Design Language APDL , in which parameters such as geometry, materials, element types, boundary conditions and loads are specified. A non-linear analysis was performed using shell elements on the chords, diagonals, plates and welds, and contact elements between the diagonals with stiffened flattened ends and the connecting plates. Initially, a numerical study of the connecting node and the stiffened flattened end was performed, and the results directed the modeling of the plane truss. The numerical results were calibrated with the experimental truss results in full scale. The numerical result of the plane truss was also compared to a theoretical study, considering the axial load eccentricity applied in the diagonal with stiffened flattened ends. The study was based on the consideration of combined effects of axial force and bending moment provided by the Brazilian standard ABNT NBR 8800:2008. The final results indicate that the numerical model proposed is efficient and has good correlation with the experimental and theoretical results.

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

Cited by 5 publications

References 9 publications

Numerical analysis of isolated end-flattened steel bars under compression in space trusses

Numerical analysis of isolated end-flattened steel bars under compression in space trusses

Análise experimental de treliça tridimensional com correção da excentricidade na ligação estampada usando espaçadores de aço e com polímero reforçado com fibra de sisal

Numerical analysis of truss systems with stiffened flattened end-bars

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