Composite beam generally connected: Analytical model

Focacci, Francesco; Foraboschi, Paolo; Stefano, Mario De

doi:10.1016/j.compstruct.2015.07.044

Cited by 50 publications

(18 citation statements)

References 70 publications

(192 reference statements)

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“…However, it is important to underline that welding generates induced stresses and local effects (reduction of section, imperfections, stress concentration, and so on), which cannot be properly taken into account through an FE analysis at the panel scale [22,24,28,29]. A complete understanding of local behavior around the contact area between connectors and welded mesh is possible only through future experimental campaigns or local FE models.…”

Section: Fe Resultsmentioning

confidence: 99%

“…Previous research on sandwich panels suggest that the nonlinear behavior of connectors is the main complexity of this system, being caused by the interaction between concrete layers and connectors [6,23,24]. Experimental campaigns show that the formation of cracks in the concrete layers is the most critical aspect in terms of structural resistance because it causes instability of the panels and increases stress in connectors [8].…”

Section: Introductionmentioning

confidence: 99%

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A More Sustainable Way for Producing RC Sandwich Panels On-Site and in Developing Countries

et al. 2017

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Abstract:The purpose of this work is to assess if traditionally used welded connectors for joining the two skins of reinforced concrete (RC) sandwich panels, used as structural walls and horizontal structural elements, can be substituted with bent ones. In this way, the scope of the effort is to reduce drastically the energy required during manufacturing, thus having a much more sustainable building product. Wire mesh on site production, in fact, requires a large amount of energy for the welding process, as stated by several Environmental Product Declaration (EPD). In addition, the production of sandwich panels with bent connectors requires a low level of automation and no qualified labor allowing the diffusion in developing countries. The procedures used to execute the work were both experimental and numerical. Structural performances were examined by testing full-scale sandwich panels under (axial and eccentric) compression and flexural loads. Additionally, a Finite Element (FE) study was developed to investigate and to optimize the dimension of welded mesh and the number of connectors. The major findings show that it is possible to substitute welded connectors with bent ones without compromising the structural performance of the tested RC sandwich panels, thus having a more sustainable way for producing these last ones.

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Section: Fe Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A More Sustainable Way for Producing RC Sandwich Panels On-Site and in Developing Countries

et al. 2017

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“…Many tests have been performed to explore the post-yield behavior of the steel columns encased in structural concrete [1,2,3,4,5,6]. An analytical model that predicts the behavior of steel–concrete composite and hybrid structures were also developed by [7] in which the mechanical behavior of composite beams was described, under no restrictive assumptions on the connection and interaction. Stresses, strains, and displacements due to loads that induce elastic or inelastic behavior in the connection were predicted.…”

Section: Introductionmentioning

confidence: 99%

Part I: The Analytical Model Predicting Post-Yield Behavior of Concrete-Encased Steel Beams Considering Various Confinement Effects by Transverse Reinforcements and Steels

Nguyen

Hong

2019

Materials

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The purpose of the work was to propose analytical model considering double confinements (provided by both transverse reinforcements and a wide flange steel section), which was verified by the nonlinear finite element analysis considering concrete-damaged plasticity. The scope of the effort and the procedures to achieve the aim of this study included the identification of the concrete confinements provided by both transverse reinforcements and a wide flange steel section based on the elasto-plastic model in tension for both rebar/steel sections and elasto-buckling for rebars in compression. The influence of rebar buckling in the compression zone on flexural moment strength was also investigated with and without considering confining effects offered by steel sections. The analytical approach predicted a post-yield behavior of composite beams based on the confining effect offered by both the shear reinforcement and wide steel flange sections. However, for beams without axial loads, the compressive zones with high and partial confinements for concrete sections at the yield and maximum load limit state were limited when compressive buckling failure was not considered, preventing the confining factors from significantly influencing the flexural load resisting capacity. An accurate flexural capacity of composite beams can be obtained when rebar was modeled with buckling in the compression zone.

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“…The failure processes of LG due to impact analyzed during pre-failure, failure and post-failure stages. Analytical models are commonly employed to describe the mechanical performance of LG for the pre and post-failure stages [46][47][48][49][50]. The post-failure response of LG is also explained by numerical simulations [51,52] and experiments.…”

Section: Literature Reviewmentioning

confidence: 99%

“…This functionality forces designers to use LG wherever there may be an injury risk due to glass fracture. A good no of theoretical studies [2][3][4][5][6][7][8], experimental studies [9][10][11][12][13][14][15][16][17][18][19][20][21][22] numerical studies [10,, LS DYNA and ABAQUS based studies [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] and discrete element (DE)/finite element (FE) based studies are reported to analyze impact failure of LG. The present work is focused on reviewing the numerical algorithms used to model the impact fracture of LG.…”

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confidence: 99%

Numerical Analysis of Impact Fracture of Laminated Glass - A Review

Vedrtnam¹

2017

MOJCE

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IntroductionLG comprises of two layers of glass and one or more layers of polymer film (inter-layer) that is sandwiched in-between by putting under heat and pressure. Inter-layer improves mechanical properties like impact strength, fracture toughness and failure mode of LG [1]. As area of impact increases there is possibility of increment of the impact resistance. The fracture of LG is designed so as to the Inter layer keeps together broken pieces that can possibly cause dangerous incidents or accidents. The LG dampens the energy of impact and improves the brittle fracture behavior when compared with monolithic glass. This functionality forces designers to use LG wherever there may be an injury risk due to glass fracture. A good no of theoretical studies [2][3][4][5][6][7][8], experimental studies [9][10][11][12][13][14][15][16][17][18][19][20][21][22] numerical studies [10,, LS DYNA and ABAQUS based studies [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] and discrete element (DE)/finite element (FE) based studies are reported to analyze impact failure of LG. The present work is focused on reviewing the numerical algorithms used to model the impact fracture of LG. Literature ReviewImpact failure analysis of LG is commonly done experimentally followed by numerical simulations. The failure processes of LG due to impact analyzed during pre-failure, failure and post-failure stages. Analytical models are commonly employed to describe the mechanical performance of LG for the pre and post-failure stages [46][47][48][49][50]. The post-failure response of LG is also explained by numerical simulations [51,52] and experiments. The literature frequently focuses on the principal damage pattern and glass-ply cracking. The commonly used numerical algorithms sighted in the literature for impact simulation are element deletion method (EDM), the continuum damage mechanics (CDM), the discrete element method (DEM), the combined discrete/finite element methods (DEM/FEMs), the extended finite element method (XFEM) and the cohesive zone model (CZM). The adhesion modeling is usually simulated using shared node method, the penalty-based methods and the intrinsic CZM. The EDM consist of removal of the mass of elements from the global mass matrix or set the stress of elements to zero, so as to represent the failure of these elements (used in LS-DYNA). This method is used in [53,54]. Xu et al. developed a numerical model on LG-PVB subjected to low-speed impact. The LG was impacted by a standard head form impactor at the speed of 8 m/s based on the LS-DYNA platform. The results were compared with the dynamic experiments of LG-PVB under head form impact to find the most accurate FE model [55]. Pyttel et al. [56] have found failure benchmark norm for the LG when subjected to impact loading. It has been stated that a hazardous energy threshold should be reached during a finite expanse before failure took place. To regulate the norm and estimate its precision, various tests with curved and plain samples of LG were p...

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Composite beam generally connected: Analytical model

Cited by 50 publications

References 70 publications

A More Sustainable Way for Producing RC Sandwich Panels On-Site and in Developing Countries

A More Sustainable Way for Producing RC Sandwich Panels On-Site and in Developing Countries

Part I: The Analytical Model Predicting Post-Yield Behavior of Concrete-Encased Steel Beams Considering Various Confinement Effects by Transverse Reinforcements and Steels

Numerical Analysis of Impact Fracture of Laminated Glass - A Review

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