Abstract
The fire resistance of double skin composite wall (DSCW) system composed of two profiled steel sheets and concrete infill is investigated through use of finite element (FE) methods. The fire resistance of DSCW when exposed to elevated temperature and a constant axial compressive load with different infill materials such as self-consolidating concrete (SCC), engineered cementitious concrete (ECC) and ultra-high performance concrete (UHPC) is investigated. The influence of parameters such as load level, thickness of steel sheets, depth of concrete core and fastener arrangement on the fire resistance of the DSCW are established. The performance of SCC-based DSCW has the best fire resistance followed by ECC and UHPC-based composite walls. The increase in load level decreases the fire resistance while the increase in depth of concrete infill increases the fire resistance of the composite wall. The fastener arrangement and steel thickness have no significant influence on the resulting fire resistance.
Highlights
This chapter summarizes results and findings of finite element (FE) and experimental analyses of past studies relevant to the research conducted in this thesis
This suggested that circular cross-sections provided the highest fire resistance, while rectangular cross-sections provided the lowest fire resistance when sectional shapes are compared with equal compressive capacity (Group 1) (Dai et al 2012)
The resulting curves obtained from the FE analysis for engineered cementitious concrete (ECC), self-consolidating concrete (SCC) and ultra-high strength/performance concrete (UHPC) walls are presented
Summary
This chapter summarizes results and findings of finite element (FE) and experimental analyses of past studies relevant to the research conducted in this thesis. Brief discussions on the results of experimental tests on the axial load behaviour of various types of composite walls including double skin composite wall (DSCW) are included This is followed by a discussion on experimental and finite element (FE) studies on the fire resistance of concrete filled steel tubular (CFST) columns. This chapter describes finite element (FE) modelling of the axial compressive behaviour of double skin composite wall (DSCW) system made of engineered cementitious composite (ECC), ultra-high performance/strength concrete (UHPC) and self-consolidating concrete (SCC) acting as concrete infill. The heat transfer results for DSCW model were generated and validated against test results on the thermal behaviour of concrete filled steel tubular (CFST) columns obtained from the literature Once both the compressive and heat transfer models were validated, a sequentially coupled thermal-mechanical analysis was conducted to determine the fire resistance of ECC, SCC and UHPC-based DSCWs
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