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

Eid, Nathalie; Joó, Attila László

doi:10.1155/2022/1207885

Cited by 4 publications

(3 citation statements)

References 26 publications

(46 reference statements)

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“…The purpose of the current study is to have a deeper understanding of the equivalent spring model (ESM) of Eid et al [13] and to compare its performance to a detailed 3-D solid FE model (later on referred as SMOD). The ESM was developed for and verified against C-sections.…”

Section: Aimsmentioning

confidence: 99%

“…Spring stiffness was calculated using Eq. ( 1) [13], where a, b, c, d, e and f are constants according to Table 2. Plate length, width and thickness was set as described before.…”

Section: Esm Fem Developmentmentioning

confidence: 99%

“…The numerical analysis of PAC-encased CFS structural members using solid finite elements is time-consuming, thus the need for an easy-to-use modelling technique has arisen. Eid et al [13] introduced a simplified finite element model for analyzing such elements in which the encasing material (PAC) was considered fully elastic, and its volume was substituted by equivalent springs representing Winklertype foundation. A modelling framework for structural members was developed where the equivalent spring stiffness was defined based on the critical buckling stress using the approximated equation in [14].…”

Section: Introduction 1advancement In Cold-formed Steelmentioning

confidence: 99%

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Assessing the Equivalent Spring Method for Modelling of Lightweight-concrete Encased Cold-formed Steel Elements in Compression

Alabedi,

Hegyi

2023

Period. Polytech. Civil Eng.

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Using concrete for filling and bracing is one of the most crucial ways to improve cold-formed steel (CFS) elements' stability behavior and performance. An example is the novel building system made up by CFS encased in ultra-lightweight concrete. The numerical analysis of such structural members using solid finite elements is time-consuming, thus the need for an easy-to-use modelling technique has arisen. As a result, a simple time-efficient equivalent spring model (ESM) has been introduced as a viable method for properly analyzing complex structural behavior in numerous cases, replacing the concrete solid with one-directional springs applying the Winkler foundation. This study aims to examine the validity and limitations of the ESM by comparing it to 3D solid model (SMOD) results for internal plate elements. The analysis results indicate that the ESM could provide accurate results in the b/t range of 100 or less for a wide range of PAC modulus (50–250 MPa) with an error of less than 5%; hence, using spring in modelling PAC within these limits is deemed acceptable. Nevertheless, for larger b/t values up to 175, doubled the calculated spring stiffness is highly recommended. In addition, the results reveal that the applicability of ESM is limited for b/t above 175; the model fails to predict the ultimate failure load, and the failure mode. Finally, this study ends by recommending one equation for calculating equivalent foundation spring stiffness for internal components that ensure optimal performance of the ESM analysis.

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Section: Aimsmentioning

confidence: 99%

“…Spring stiffness was calculated using Eq. ( 1) [13], where a, b, c, d, e and f are constants according to Table 2. Plate length, width and thickness was set as described before.…”

Section: Esm Fem Developmentmentioning

confidence: 99%

Section: Introduction 1advancement In Cold-formed Steelmentioning

confidence: 99%

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Assessing the Equivalent Spring Method for Modelling of Lightweight-concrete Encased Cold-formed Steel Elements in Compression

Alabedi,

Hegyi

2023

Period. Polytech. Civil Eng.

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Simplified Numerical Model Development of Lightweight‐concrete Encased Cold‐formed Steel Column‐end Joints and Panels

Eid¹,

Joó²

2022

ce papers

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Simplified numerical model development for advanced design of lightweight-concrete encased cold-formed steel shear wall panels

Eid,

Joó

2023

SN Appl. Sci.

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Since cold-formed steel (CFS) elements are susceptible to complex buckling phenomena that decrease their structural capability, many strengthening trends have been developed so far. One of these methods is the use of polystyrene aggregate concrete (PAC) as bracings in order to restrain the global and distortional buckling modes of CFS members, where a new structural system comprising CFS elements encased in PAC has been proposed. In this research, PAC-encased CFS shear panels have been investigated numerically, where a simplified finite element model was developed to predict the structural behavior and capacity of such members. This goal was achieved using ANSYS software, where a geometrically and materially nonlinear analysis with imperfections (GMNI) was used to solve the problem of PAC-encased CFS shear panels. The full detailed volume-contact element-based concrete model was replaced by spring elements perpendicular to the plate’s plane with equivalent properties, and beam elements that could represent the concrete block more accurately regarding the global lateral stiffness and shear resistance. Consequently, for this case, the combination of local and global stiffness of PAC could produce the actual shear behavior of PAC-filled wall panels. The developed model was validated against previous experimental tests from the literature. Parametric studies were conducted in terms of the imperfection amplitudes, the stiffness of springs and the properties of PAC. Finally, the structural performance of PAC-encased panels under combined axial and shear loading was examined, where the effect of different axial load levels on the lateral strength was determined, and an interaction equation was proposed.

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

Cited by 4 publications

References 26 publications

Assessing the Equivalent Spring Method for Modelling of Lightweight-concrete Encased Cold-formed Steel Elements in Compression

Assessing the Equivalent Spring Method for Modelling of Lightweight-concrete Encased Cold-formed Steel Elements in Compression

Simplified Numerical Model Development of Lightweight‐concrete Encased Cold‐formed Steel Column‐end Joints and Panels

Simplified numerical model development for advanced design of lightweight-concrete encased cold-formed steel shear wall panels

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