Experimental investigations on ultra-lightweight-concrete encased cold-formed steel structures

Hegyi, Péter; Dunai, László

doi:10.1016/j.tws.2016.01.003

Cited by 28 publications

(22 citation statements)

References 4 publications

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“…But normal-weight concrete mass increases the dead loads of the shear wall and consequently increases the building seismic base shear. Also, shear walls filled with low compressive strength (0.8-2.0 MPa) LFC, the shear strength was not efficiently improved (Hegyi and Dunai, 2016). used a higher strength LFC as a new type of LFC, which helped in improving the seismic performance of CFS shear walls in a better way.…”

Section: Literature Reviewmentioning

confidence: 99%

Finite element analysis of lateral response of lightweight foamed concrete-filled cold-formed steel walls

Alabbadi

Allouzi

2022

IJSI

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PurposeThe purpose of this study is to improve the lateral capacity of Cold-Formed Steel (CFS) frame walls filled with lightweight foamed concrete (LFC) and supported with straw boards by introducing structural foamed concrete and/or bracing.Design/methodology/approachFinite element models are developed and calibrated based on previous experimental work. Then, these models are extended to conduct a parametric study to quantify the effect of filling CFS walls and structural LFC and the effect of supporting CFS walls with bracing.FindingsResults of the study conclude that the finite element analysis can be used to simulate and analyze the lateral capacity of CFS walls effectively since the maximum deviation between calibrated and experimental results is 10%. The structural LFC usage in CFS walls improves the lateral capacity considerably by (25–75) % depending on the wall properties. Besides, the application of lateral bracing does not always have a positive effect on the lateral performance of these walls.Originality/valueAlthough CFS walls are preferred due to it is light in weight, low in cost, easy to install and recyclable, low seismic performance, buckling vulnerability, poor thermal insulation and sound insulation properties, low lateral stiffness, and low shear strength limit their use. This study proposes the use of structural foamed concrete and a different bracing method than what is available in the literature. This can overcome the drawbacks of the CFS walls alone which can permit the usage of such walls in mid-rise buildings and other applications.

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Section: Literature Reviewmentioning

confidence: 99%

Finite element analysis of lateral response of lightweight foamed concrete-filled cold-formed steel walls

Alabbadi

Allouzi

2022

IJSI

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“…The number of hybrid or multi-material structural solutions in use will increase significantly, targeting enhanced structural performance [ 17 ]. The composite behavior of CFS-concrete members has been investigated in the past, where the CFS profiles have also been considered as a replacement for traditional reinforcement bars, and others assessing the benefits and potential of composite structures combining CFS products and concrete [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. Several studies were undertaken to investigate the behavior of shear connectors and composite beams [ 19 , 20 , 22 , 27 , 28 , 29 , 30 , 31 ], showing high levels of ductility and load-bearing capacity.…”

Section: Introductionmentioning

confidence: 99%

Structural Fire Performance of Concrete-Filled Built-Up Cold-Formed Steel Columns

et al. 2022

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Concrete-filled composite columns are widely used in the construction industry, exploiting the benefits of combining steel and concrete, providing, for instance, high load-bearing capacities and enhanced fire resistance. These solutions are extensively used in high-rise buildings and/or when high fire resistance performance requirements are imposed. In this exploratory research, a new type of concrete-filled composite column is investigated using fire resistance tests. Promoting the use of cold-formed steel products and developing innovative solutions for low-rise buildings with lower passive fire protection requirements led to the solutions presented in this research. Hence, a set of fire-resistance tests were undertaken on concrete-filled closed built-up cold-formed steel columns, where single cold-formed steel shapes are combined and fastened to create a box-shaped cross-section. The experimental results were then compared with the corresponding bare steel solutions to assess, in detail, the observed enhancements. Additionally, the effect of restraint on thermal elongation was assessed.

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“…Nowadays, many novel research projects have been conducted to investigate new con gurations of thin-walled steel structures. For example, an experimental project was conducted at the Budapest University of Technology and Economics in Hungary to test CFS elements encased in lightweight concrete [1]. is experimental program was used in this paper to validate the numerical model.…”

Section: Introductionmentioning

confidence: 99%

“…e results showed that they showed better performance compared to normal-strength concrete (NSC) and high-strength concrete (HSC) lled columns. Likewise, the exural [6] and axial [1] behaviors of polystyrene aggregate concrete (PAC) braced CFS specimens were tested. In this case, only the local buckling mode was observed, and the capacity was enhanced.…”

Section: Introductionmentioning

confidence: 99%

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Simplified Numerical Model Development for Advanced Design of Lightweight‐Concrete Encased Cold‐Formed Steel Compressed Elements

Eid

Joó

2022

Advances in Civil Engineering

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The utilization of cold-formed steel (CFS) elements has become more popular recently, due to their cost efficiency and feasibility in construction work. Nevertheless, since such elements are subjected to a variety of complex stability issues, numerous approaches to strengthening have been examined. Namely, CFS members were braced by using lightweight concrete through a previous experimental program. A simplified finite element model was performed consistently with the previous experimental work, to estimate the ultimate load of encased CFS members subjected to compression. The main aim of this research was to overcome the difficulties of modeling the concrete block by substituting the volume element with springs. In addition, a practical equation was proposed to predict the stiffness of springs, and an imperfection amplitude was set to obtain the design capacity of braced CFS compressed elements.

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Experimental investigations on ultra-lightweight-concrete encased cold-formed steel structures

Cited by 28 publications

References 4 publications

Finite element analysis of lateral response of lightweight foamed concrete-filled cold-formed steel walls

Finite element analysis of lateral response of lightweight foamed concrete-filled cold-formed steel walls

Structural Fire Performance of Concrete-Filled Built-Up Cold-Formed Steel Columns

Simplified Numerical Model Development for Advanced Design of Lightweight‐Concrete Encased Cold‐Formed Steel Compressed Elements

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