Abstract
Sandwich panels with textile-reinforced cement (TRC) faces merge both structural and insulating performance into one lightweight construction element. To design with sandwich panels, predictive numerical models need to be thoroughly validated, in order to use them with high confidence and reliability. Numerical bending models established in literature have been validated by means of local displacement measurements, but are missing a full surface strain validation. Therefore, four-point bending tests monitored by a digital image correlation system were compared with a numerical bending model, leading to a thorough validation of that numerical model. Monitoring with a digital image correlation (DIC) system gave a highly detailed image of behaviour during bending and the strains in the different materials of the sandwich panel. The measured strains validated the numerical model predictions of, amongst others, the multiple cracking of the TRC tensile face and the shear deformation of the core.
Highlights
Structural insulating sandwich panels combine a lightweight insulating core with two thin stiff faces, they can improve the energy efficiency of the building and provide the necessary structural capacity
This paper presents a detailed comparison between a numerical prediction and experimental papersandwich presents a beams detailedunder comparison between a numerical prediction andThe experimental resultsThis of textile-reinforced cement (TRC)
Numerical model results of TRC sandwich beams under four-point bending by means of digital image correlation (DIC)
Summary
Structural insulating sandwich panels combine a lightweight insulating core with two thin stiff faces, they can improve the energy efficiency of the building and provide the necessary structural capacity. Pre-cast concrete sandwich panels are frequently used for walls in residential and commercial buildings, since their energy efficiency and structural capacity are well-known [1,2,3,4] The weight of these concrete sandwich panels can be drastically reduced by replacing the steel-reinforced concrete faces by textile-reinforced cement (TRC) faces. Due to the use of textiles instead of steel, the thick concrete cover (needed for durability reasons in case of steel) can be avoided This reduces the thickness of the faces, and the weight as well
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