Experimental study on fire resistance of glulam-lightweight concrete composite slabs with inclined crossing screws

Abstract

Composite slabs made of lightweight concrete and glulam (TLCC) are sustainable and structurally efficient construction elements, since they combine the compressive strength of concrete with the flexural resistance of glulam. However, there is a lack of information in standards and codes about its behavior in fire conditions. The study of its fire resistance represents an innovative contribution that will increase its use in the construction sector. An experimental study following UNE-EN 1363-1:2021 standard was carried out to determine the fire resistance of TLCCs, made with local and northern European woods, joined with inclined crossing screws. During the tests, all the slabs met the integri-ty and insulation criteria indicated in the standard, bearing capacity being the one that determined their completion. In all cases, test stopped when the deflection speed limit indicated in the standard was exceeded. Once the results were analyzed, it was determined that only TLCC made with Chest-nut offers R30 fire protection.