STAINLESS STEEL IN FIRE (SSIF) - Steel-stainless.org

4 WP2: COMPOSITE MEMBERS IN FIREDetailed descriptions of the activities carried out under this work package are given in the relevant FinalWork Package Report listed in Section 11.4.1 ObjectivesThe objective of this work package was to develop design guidance for composite members in fire by aprogramme of fire tests on concrete filled columns and floor beams with concrete fire protection.4.2 Experimental work4.2.1 Composite columnsSeven columns were tested, each consisting of square hollow sections (SHS) filled with concrete whichwas reinforced in some tests and unreinforced in others. The details of the columns are given inTable 4.1. The columns were grade 1.4401 stainless steel.Table 4.1Structural details of composite columns with hollow steel sectionsColumnCrosssectionb×e (mm)StainlessSteel gradediameterRebarCover 1)(mm)Load(KN)LoadingFireresist.Lengtheccentricity (min) (mm)n°1 150×8 EN 1.4401 none - 400 5 mm 30 4000n°2 200×8 EN 1.4401 none - 240 0.25×b 2) 60 4000n°3 200×8 EN 1.4401 4Φ14 30 630 5 mm 30 4000n°4 200×8 EN 1.4401 4Φ14 30 240 0.25×b 2) 60 4000n°5 300×8 EN 1.4401 none - 750 0.5×b 2) 30 4000n°6 300×8 EN1.4401 4Φ22 30 1000 0.125×b 2) 60 4000n°7 300×8 EN 1.4401 4Φ22 30 800 0.25×b 2) 60 40001) Distance between the axis of longitudinal reinforcements and the border of concrete core2) External side of hollow steel sectionColumns were subjected to a compressive load and exposed to controlled heating following the EN1363-1 standard fire curve. The specimens were pinned at both ends; they were free to rotate about onedirection but were restrained against rotation about the perpendicular direction. Figure 4.1 shows thearrangement of the columns in the furnace.29