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CIVIL AND STRUCTURAL ENGINEERING COMPUTATIONAL TECHNOLOGY
Edited by: B.H.V. Topping and Y. Tsompanakis
Numerical Modelling and Analysis of Composite Structures subject to Extreme Loading
R.Y. Xiao1, Z.W. Gong1, C.S. Chin1 and C.G. Bailey2
1Department of Urban Engineering, Faculty of Engineering, Science and Built Environment, London South Bank University, United Kingdom
R.Y. Xiao, Z.W. Gong, C.S. Chin, C.G. Bailey, "Numerical Modelling and Analysis of Composite Structures subject to Extreme Loading", in B.H.V. Topping and Y. Tsompanakis, (Editor), "Civil and Structural Engineering Computational Technology", Saxe-Coburg Publications, Stirlingshire, UK, Chapter 10, pp 279-299, 2011. doi:10.4203/csets.28.10
Keywords: composite structure, connections, composite floor, composite frame, finite element method, elevated-temperature, fire.
A composite structure is constructed by steel columns, steel beams and a composite floor. It has been widely used in the modern construction industry as a result of their advantages such as higher strength and stiffness, a shorter construction period and easier handing on site. However, arising from the significant difference in the thermal properties of steel and concrete elements, the composite structure could be quite different when subject to a fire situation compared with that of a bare steel or concrete structure.
This chapter highlights the fire resistance behaviour of composite structures and provides in-depth understanding of the performance of a whole structure with the interactions between each of its elements under the fire condition. In the research the finite element model has been developed to simulate the behaviour of composite connections, floors and frames under fire by using the ANSYS software. The composite structure is simulated under exposure to the ISO834 standard fire, and the modelling results showed agreement with the fire test.
The finite element results have been compared with experimental data. The results obtained showed good agreement in both elastic and plastic stages. The degradation of the connection strength and stiffness with the increasing temperatures is well predicted by the model. This demonstrates that the finite element technique is capable of predicting connection response at elevated temperature. For the composite flooring system, the thermal analysis indicates that the temperature distribution in the same section of the concrete slab is different along the same plane. The full finite element models on connections and composite floor have been successfully implemented to full scale composite frame analysis. This has provided a robust tool for designing composite structure under fire.
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