Numerical analysis of steel columns stabilized by sandwich panels

Ma, Zhongcheng; Havula, Jarmo; Heinisuo, Markku

doi:10.23998/rm.65309

Cited by 3 publications

(12 citation statements)

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“…The panels are connected to the flanges of the members by screws of 5.5 mm diameter at the corners of the panels with edge distance 30 mm in both directions. This case has been studied experimentally in [12] and by FEM in [17].…”

Section: Simply Supported Membermentioning

confidence: 99%

“…In the tests small eccentricities of L/1000 were present in both directions. The FEM calculations of [17] gave the result 419 kN. The FEM model included the same geometrical imperfections as the tests and measured [12] residual stresses of HEA120.…”

Section: Simply Supported Membermentioning

confidence: 99%

“…In the tests edge distances of screws with the diameter 5.5 mm was 30 mm in both directions. In the FEM results were detected some lateral-torsional displacements at the ultimate limit state [17], which were not reported in the tests [12]. Torsional restraints were not used in the FEM model, only the lateral restraints.…”

Section: Simply Supported Membermentioning

confidence: 99%

“…The theory of [12] was studied extensively in a European project EASIE [5] leading to the design recommendations [7]. In [17] are presented the FEM simulations and the results were in the good agreement with the tests of [12]. In [11] are presented analytical solutions of flexural buckling cases and parametric studies with different properties of panels and members.…”

Section: Introductionmentioning

confidence: 99%

“…The structure of this paper is as follows. In the chapter 1 are given comparisons between results of tests [12], FEM [17] and the analytic method aiming to demonstrate the usability of the analytic method in real structures. In the chapter 2 buckling of four Euler cases are presented and the comparisons are given with FEM.…”

Section: Introductionmentioning

confidence: 99%

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Buckling analysis of members restrained by sandwich panels

Heinisuo

2021

RakMek

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An analytic method is presented for the analysis of flexural restraint of members by sandwich panels. Using the method, which is based on the solutions of the fourth order differential equations, the restraint effect of sandwich panels can be approximated in practical cases. The reliability of the method is shown based on tests and finite element analyses. New results are shown using the analytic method for buckling cases and for P-δ analysis in the elastic range. The exact finite element method (FEM) formulation is given for more complicated cases.

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Section: Simply Supported Membermentioning

confidence: 99%

Section: Simply Supported Membermentioning

confidence: 99%

Section: Simply Supported Membermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Buckling analysis of members restrained by sandwich panels

Heinisuo

2021

RakMek

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FE Model Validation and Advanced Analyses of Steel Members with Steel Claddings at Elevated Temperatures

Ma¹,

Havula²,

Joó³

et al. 2021

ce papers

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In order to investigate the stabilization effect of distinct steel members by steel cladding system including trapezoidal sheeting and sandwich panels in fire using advanced analysis techniques, the computer models and modeling techniques must be validated by available experiment tests. However, the fire tests in this area are scarce. As part of a wider validation scheme, this paper presents the modeling method using Ls Dyna explicit solver and the comparison of FE analysis results with four experimental tests at elevated low to medium temperatures (150‐300 °C) in RFCS STABFI project. After the model validation, the advanced fire analyses of steel columns with two types of steel claddings such as trapezoidal sheeting and sandwich panel are carried out to investigate the stabilization effect. The analyses show that for the studied I‐section column under both axial compression and bending moment, the position of steel claddings, either connecting with the tension flange or the compression flange, has significant influence on the fire resistance of the steel columns. When the trapezoidal sheet is connected with the compression flange, the fire resistance of steel column is 17 % more than that without cladding. Sandwich panel cladding has influences on the deformational behavior of column during the fire exposure. However, the contribution of sandwich panels to the fire resistance of steel columns is negligible due to the delamination of inner panel sheet.

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Structural Fire Analysis of One‐storey Steel‐framed Buildings with Steel Claddings

Ma¹,

Havula²,

Mela³

et al. 2021

ce papers

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Traditionally the structural stability of steel building frames is ensured by frame action or bracing elements. Recent European research projects have demonstrated that significant cost savings can be achieved, if cladding panels forming the building envelope are used to provide stability. The purpose of the paper is to investigate the possible stabilization effect of steel structures by steel claddings in fire, without additional wind bracings using Finite Element Method. The Finite Element analyses for full‐scale steel‐framed buildings with steel claddings under fires are still challenging due to large number of elements in the steel claddings. In this paper, the equivalent orthotropic shell element is used to model the trapezoidal roof sheeting, and composite shell element with soft core is used to model the sandwich panel in the cool compartment. Due to the delamination of inner steel face in fire, the sandwich panels in the fire compartment can be either neglected or modeled with two‐layer composite shell ignoring the inner steel sheet. The comparative study is performed, and the results suggest that the difference is small and the sandwich panels in the fire compartment can be neglected. The stabilization effect of steel claddings in fire is studied by the comparison of deformation and force responses between buildings with traditional steel bracings and with steel cladding only. In case of ISO fire, the fire resistance of entire one‐storey building with steel claddings only is 22% longer than the one with traditional steel bracings.

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Numerical analysis of steel columns stabilized by sandwich panels

Cited by 3 publications

References 1 publication

Buckling analysis of members restrained by sandwich panels

Buckling analysis of members restrained by sandwich panels

FE Model Validation and Advanced Analyses of Steel Members with Steel Claddings at Elevated Temperatures

Structural Fire Analysis of One‐storey Steel‐framed Buildings with Steel Claddings

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