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http://dx.doi.org/10.12989/sem.2009.32.5.635

Experimental study on fire performance of axially-restrained NSC and HSC columns  

Wu, Bo (State Key Laboratory of Subtropical Building Science, South China University of Technology)
Li, Yi-Hai (State Key Laboratory of Subtropical Building Science, South China University of Technology)
Publication Information
Structural Engineering and Mechanics / v.32, no.5, 2009 , pp. 635-648 More about this Journal
Abstract
This paper describes fire performance of eight axially restrained reinforced concrete (RC) columns under a combination of two different load ratios and two different axial restraint ratios. The eight RC columns were all concentrically loaded and subjected to ISO834 standard fire on all sides. Axial restraints were imposed at the top of the columns to simulate the restraining effect of the rest of the whole frame. The axial restraint was effective when the column was expanding as well as contracting. As the results of the experiments have shown, the stiffness of the axial restraint and load level play an important role in the fire behaviors of both HSC and NSC columns. It is found that (a) the maximum deformations during expanding phase were influenced mostly by load ratio and hardly by axial restraint ratio, (b) For a given load ratio, axial restraint ratio had a great impact on the development of axial deformation during contraction phase beyond the initial equilibrium state, (c) increasing the axial restraint increased the value of restraint force generated in both the NSC and HSC columns, and (d) the development of column axial force during the contracting and cooling phase followed nearly parallel trend for columns under the same load ratio.
Keywords
high-strength concrete; column; fire performance; axial restraint; cooling phase;
Citations & Related Records

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1 Wang, Y.C. (1999), "The effects of structural continuity on the fire resistance of concrete filled columns in nonsway frames", J. Constr. Steel Res., 50(2), 177-197   DOI   ScienceOn
2 Wang, Y.C. and Davies, J.M. (2003a), “An experimental study of non-sway loaded and rotationally restrained steel column assemblies under fire conditions: analysis of test results and design calculations”, J. Constr. Steel Res., 59(3), 291-313   DOI   ScienceOn
3 Wang, Y.C. and Davies, J.M. (2003b), "An experimental study of the fire performance of non-sway loaded concrete-filled steel tubular column assemblies with extended end plate connections", J. Constr. Steel Res., 59(7), 819-838   DOI   ScienceOn
4 Wang, Y.C. and Davies, J.M. (2003c), "Fire tests of non-sway loaded and rotationally restrained steel column assemblies", J. Constr. Steel Res., 59(3), 359-383   DOI   ScienceOn
5 Ali, F. and O'Connor, D. (2001), "Structural performance of rotationally restrained steel columns in fire", Fire Safety J., 36(7), 679-691   DOI   ScienceOn
6 Ali, F., Nadjai, A., Silcock, G. and Abu-Tair, A. (2004), "Outcomes of a major research on fire resistance of concrete columns", Fire Safety J., 39(6), 433-445   DOI   ScienceOn
7 Ali, F.A., Shepherd, P., Randall, M., Simms, I.W., O'Connor, D.J. and Burgess, I. (1998), "The effect of axial restraint on the fire resistance of steel columns", J. Constr. Steel Res., 46(1-3), 305-306   DOI   ScienceOn
8 Benmarce, A. and Guenfoud, M. (2005), "Behaviour of axially restrained high strength concrete columns under fire", Construction and Building Materials, V. In Press, Corrected Proof, No. pp. 476   DOI
9 Cabrita Neves, I. (1995), "The critical temperature of steel columns with restrained thermal elongation", Fire Safety J., 24(3), 211-227   DOI   ScienceOn
10 Cabrita Neves, I., Valente, J.C. and Correia Rodrigues, J.P. (2002), "Thermal restraint and fire resistance of columns", Fire Safety J., 37(8), 753-771   DOI   ScienceOn
11 Huang, Z.F., Tan, K.H. and Ting, S.K. (2006), "Heating rate and boundary restraint effects on fire resistance of steel columns with creep", Eng. Struct., 28(6), 805-817   DOI   ScienceOn
12 Eurocode2 (2004), European Committee for Standardization (Cen), Design of Concrete Structures: Part 1.2. General Rules – Structural Fire Design. Bs En 1992-1-2., Brussels (United Kingdom)
13 Huang, Z.F. and Tan, K.H. (2004), "Effects of external bending moments and heating schemes on the responses of thermally restrained steel columns", Eng. Struct., 26(6), 769-780   DOI   ScienceOn
14 Huang, Z.F., Tan, K.H. and Phng, G.H. (2007), "Axial restraint effects on the fire resistance of composite columns encasing I-section steel", J. Constr. Steel Res., 63(4), 437-447   DOI   ScienceOn
15 Rodrigues, J.P.C., Cabrita Neves, I. and Valente, J.C. (2000), "Experimental research on the critical temperature of compressed steel elements with restrained thermal elongation", Fire Safety J., 35(2), 77-98   DOI   ScienceOn
16 Tan, K.H., Toh, W.S., Huang, Z.F. and Phng, G.H. (2007), "Structural responses of restrained steel columns at elevated temperatures. Part 1: Experiments", Eng. Struct., 29(8), 1641-1652   DOI   ScienceOn
17 Valente, J.C. and Neves, I.C. (1999), "Fire resistance of steel columns with elastically restrained axial elongation and bending", J. Constr. Steel Res., 52(3), 319-331   DOI   ScienceOn
18 Wang, Y.C. (1997), "Effects of structural continuity on fire resistant design of steel columns in non-sway multistorey frames", Fire Safety J., 28(2), 101-116   DOI   ScienceOn