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Nguyen, T-T.; Tan, K-H.; Burgess, I.W. (2015)
Publisher: Elsevier
Languages: English
Types: Article
This paper presents the experimental observations and results of three one-quarter scale composite slab-beam systems, 3.15 m by 3.15 m in plan, and tested in fire conditions. The tests aimed to examine the effects of unprotected interior secondary beams and edge rotational restraint on the behaviour of floor assemblies. The test results show that continuity of reinforcement in the slab over the supporting beams, and the presence of interior beams, can reduce the slab deflection and enhance its load-bearing capacity. Interior beams can be left unprotected without leading to a structural failure. The interior beams play a major role in helping the slab to move from biaxial bending stage to membrane behaviour, enabling the slab to mobilize higher tensile membrane forces. Rotational restraint along the protected edge beams induces intense stress concentration above these beams, resulting in more severe concrete crushing at the four corners and wide cracks over the edge beams. In addition to the experimental study, a numerical model using ABAQUS has been developed to simulate the tests. The numerical predictions agree well with the experimental results, showing that the proposed model is reliable. A shortcoming of the study is that the fire resistance performance of the specimens cannot be compared with those in practical design because a real furnace fire and small-scale fire tests were used due to limits of the furnace. However, the experimental results do provide basic information on the membrane behaviour in fire and also allow analytical methods and numerical models to be validated.
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    • [8] Bailey CG, Toh WS. Small-scale concrete slab tests at ambient and elevated temperatures. Engineering Structures. 2007;29:2775-91.
    • [3] Izzuddin BA, Elghazouli AY. Failure of lightly reinforced concrete members under fire. I: Analytical modeling. J Struct Eng-ASCE. 2004;130:3-17.
    • Bailey CG, White DS, Moore DB. The tensile membrane action of unrestrained composite slabs simulated under fire conditions. Engineering Structures. 2000;22:1583- 95.
    • Bailey CG, Moore DB. Structural behaviour of steel frames with composite floor slabs subject to fire: Part 1: Theory. The Structural Engineer. 2000;78:19-27.
    • Bailey CG, Moore DB. Structural behaviour of steel frames with composite floorslabs subject to fire: Part 2: Design. The Structural Engineer. 2000;78:28-33.
    • [16] EN 1992-1-1: Eurocode 2. Design of Concrete Structures. Part 1-1: General Rules and Rules for Buildings. European Committee for Standardization (CEN), Brussels, 2004.
    • [17] EN 1993-1-8: Eurocode 3. Design of Steel Structures. Part 1-8: Design of joints. European Committee for Standardization (CEN), Brussels, 2005.
    • [18] ABAQUS/CAE User's Manual 6.9: Dassault Systèmes Simulia Corp., Providence, RI, USA; 2009.
    • [19] EN 1994-1-2: Eurocode 4. Design of composite steel and concrete structures. Part 1-2: General Rules - Structural fire design. European Committee for Standardization (CEN), Brussels, 2005.
    • [20] Nguyen TT, Tan KH. Numerical Investigations of Composite Slab-Beam Floor Systems Exposed to ISO Fire. Applications of Structural Fire Engineering. Prague, Czech Republic, 2011.
    • [21] Bailey CG, Toh WS. Behaviour of concrete floor slabs at ambient and elevated temperatures. Fire Safety Journal. 2007;42:425-36.
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