Flexural behavior of composite structural insulated panels with magnesium oxide board facings
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(2020) 20:105
ORIGINAL ARTICLE
Flexural behavior of composite structural insulated panels with magnesium oxide board facings Łukasz Smakosz1 · Ireneusz Kreja1 · Zbigniew Pozorski2 Received: 2 June 2020 / Revised: 15 July 2020 / Accepted: 24 August 2020 © The Author(s) 2020
Abstract The current report is devoted to the flexural analysis of a composite structural insulated panel (CSIP) with magnesium oxide board facings and expanded polystyrene (EPS) core, that was recently introduced to the building industry. An advanced nonlinear FE model was created in the ABAQUS environment, able to simulate the CSIP’s flexural behavior in great detail. An original custom code procedure was developed, which allowed to include material bimodularity to significantly improve the accuracy of computational results and failure mode predictions. Material model parameters describing the nonlinear range were identified in a joint analysis of laboratory tests and their numerical simulations performed on CSIP beams of three different lengths subjected to three- and four-point bending. The model was validated by confronting computational results with experimental results for natural scale panels; a good correlation between the two results proved that the proposed model could effectively support the CSIP design process. Keywords Sandwich panel · Composite structural insulated panel · Magnesium oxide board · Bimodular material · Flexure test · Finite element analysis
1 Introduction Sandwich structures are becoming increasingly popular in civil engineering applications, as their use allows for a reduction of dead weight, improvement of sustainability, and overall cost-efficiency [1–3]. The low weight makes even large modular elements easy to handle, significantly improving the speed of transport and assembly [2, 4]. Some notable examples of sandwich structure applications in civil engineering can be found in the housing industry [2, 4] and footbridges [5, 6]. The general idea of a sandwich structure is to combine two thin high-strength facings and a light structural core, to create a panel of considerable strength and stiffness [7, 8]. An essential advantage of the sandwich concept is its versatility. It can be tailored, through the use of different geometric proportions and various combinations of facing
* Łukasz Smakosz [email protected] 1
Gdańsk University of Technology, Gdańsk, Poland
Poznan University of Technology, Poznań, Poland
2
and core materials, to acquire properties required for a particular purpose [9, 10]. Structural insulated panel (SIP) is a type of sandwich structure designed for use in single- and two-story buildings. SIPs are typically composed of a thick foam core and woodbased facings (e.g., oriented strand board), and distinguish themselves by the threefold role they play in a structure: (1) enveloping functionality, (2) thermal insulation, (3) transfer of structural loads. They are applied as structural parts of walls, floors, and roofs for a quick assembly of energyefficient, “green” buildings resista
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