International journal of steel structures (국제강구조저널)

Korean Society of Steel Construction (한국강구조학회)
권호 표지
DOI QR코드

DOI QR Code

Analytical Behavior of Eccentrically Loaded Concrete Encased Steel Columns Subjected to Standard Fire including Cooling Phase

  • Du, Er-Feng (School of Civil Engineering, Southeast University) ;
  • Shu, Gan-Ping (Key Lab of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University) ;
  • Mao, Xiao-Yong (School of Civil Engineering, Suzhou University of Science and Technology)
  • Published : 2013.03.31
⟨ Previous Next ⟩

Abstract

A nonlinear 3-D finite element analysis (FEA) model was developed to predict the behavior of eccentrically loaded concrete encased steel (CES) columns subjected to ISO-834 standard fire including heating and cooling phases. The finite element model has been validated against published tests conducted at elevated temperatures. Comparisons between the predicted results and the test results show that this model can accurately predict the behavior of CES columns under fire. The FEA model was then used to investigate the typical temperature-time curve and mid-height lateral deformation-time curve of eccentric compression CES columns in a complete loading history including initial loading, heating and cooling. It is shown that the temperature delay is obvious at the inner layers of concrete. The fire resistance of a CES column should be checked for the full process of fire exposure until temperatures everywhere in the column start to decrease. The lateral deformation of the column still gradually increases during the cooling phase and the column may fail during that phase. There is a large residual deformation after the fire exposure. Furthermore, the variables that influence the behavior of the CES columns under fire were investigated in parametric studies. It is found that the main parameters which influence the lateral deformation-time curve of the column during the full process of fire exposure are load ratio, slenderness ratio, duration time, depth to width ratio and steel ratio, and the main parameters which influence the residual deformation ratio of the column after fire are load ratio, duration time, cross-sectional depth and steel ratio.

Keywords

References

  1. ANSYS Inc. (2009). Release 12.1, Documentation for ANSYS. ANSYS Inc., Pennsylvania, USA.
  2. Du, E. F. (2009). The mechanical performance of SRC columns during the whole period of standard fire. Dissertation for the Master Degree in Engineering, School of Civil Engineering, Suzhou University of Science and Technology, Suzhou, China (in Chinese).
  3. Du, E. F. and Mao, X. Y. (2009). "Calculation of temperature field of steel reinforced concrete columns under fire." Journal of Suzhou University of Science and Technology (Engineering and Technology), 22(1), pp. 15-18 (in Chinese).
  4. EC3 (2005). Eurocode 3:Design of Steel Structures - Part 1-2: General Rules - Structural Fire Design. British Standards Institution, BS EN 1993-1-2, London, UK.
  5. Ellobody, E. and Young, B. (2010). "Investigation of concrete encased steel composite columns at elevated temperatures." Thin-Walled Structures, 48(8), pp. 597-608. https://doi.org/10.1016/j.tws.2010.03.004
  6. Hass, R. (1986). Practical rules for the design of reinforced concrete and composite columns submitted to fire. Technical Rep., No. 69, Institute für Baustoffe, Massivbau und Brandschutz der Technischen University Braunschweig, Braunschweig, Germany (in German).
  7. 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." Journal of Constructional Steel Research, 63(4), pp. 437-447. https://doi.org/10.1016/j.jcsr.2006.07.001
  8. ISO-834 (1980). Fire-Resistance Tests-Elements of Building Construction. Amendment 1, Amendment 2, International Standard.
  9. Jiang, D. H., Li, G. Q., Wang, S. W., and Zhang, B. (2005). "Research on the fire resistant capacity of SRC columns subjected to axial compression." Steel Construction, 20(82), pp. 87-91 (in Chinese).
  10. Jiang, D. H., Li, G. Q., and Zhang, B. (2006). "Research on the fire resistant capacity of eccentric loaded SRC columns." Progress in Steel Building Structures, 8(2), pp. 55-62 (in Chinese).
  11. Li, W. and Guo, Z. H. (1993). "Experimental investigation of strength and deformation of concrete at elevated temperature." Journal of Building Structures, 14(1), pp. 8-16 (in Chinese).
  12. Lie, T. T. (1994). "Fire resistance of circular steel columns filled with bar-reinforced concrete." Journal of Structural Engineering, ASCE, 120(5), pp. 1489-1509. https://doi.org/10.1061/(ASCE)0733-9445(1994)120:5(1489)
  13. Lie, T. T. and Denham, E. M. A. (1993). "Factors affecting the fire resistance of circular hollow steel columns filled with bar-reinforced concrete." NRC-CNRC Internal Report, No. 651, Ottawa. Canada.
  14. Malhotra, H. L. and Stevens, R. F. (1964). "Fire resistance of encased steel stanchions." Proc. Institution of Civil Engineers ICE, Vol. 27, pp. 77-97.
  15. Mao, X. Y. and Kodur, V. K. R. (2011). "Fire resistance of concrete encased steel columns under 3- and 4-side standard heating." Journal of Constructional Steel Research, 67(3), pp. 270-280. https://doi.org/10.1016/j.jcsr.2010.11.006
  16. Song, T. Y., Han, L. H., and Yu, H. X. (2011). "Temperature field analysis of SRC-column to SRC-beam Joints subjected to simulated fire including cooling Phase." Advances in Structural Engineering, 14(3), pp. 353-366. https://doi.org/10.1260/1369-4332.14.3.353
  17. Wang, Z. H. and Tan, K. H. (2006). "Residual area method for heat transfer analysis of concrete-encased I-sections in fire." Engineering Structures, 28(3), pp. 411-422. https://doi.org/10.1016/j.engstruct.2005.08.013
  18. Yu, J. T., Lu, Z. D., and Xie, Q. (2007). "Nonlinear analysis of SRC columns subjected to fire." Fire Safety Journal, 42(1), pp. 1-10. https://doi.org/10.1016/j.firesaf.2006.06.006
  19. Young, B. and Ellobody, E. (2011). "Performance of axially restrained concrete encased steel composite columns at elevated temperatures." Engineering Structures, 33(1), pp. 245-254. https://doi.org/10.1016/j.engstruct.2010.10.019
  20. Zheng, Y. Q. and Han, L. H. (2006a). "Fire performance and design method of steel reinforced concrete (SRC) columns (I)." Progress in Steel Building Structures, 8(2), pp. 22-29 (in Chinese).
  21. Zheng, Y. Q. and Han, L. H. (2006b). "Fire performance and design method of steel reinforced concrete (SRC) columns (II)." Progress in Steel Building Structures, 8(3), pp. 24-33 (in Chinese).

Cited by

  1. Experimental research on the behaviour of eccentrically loaded SRC columns subjected to the ISO-834 standard fire including a cooling phase vol.16, pp.2, 2013, https://doi.org/10.1007/s13296-016-6014-0
  2. Numerical analysis on mechanical property of concrete filled steel tube reinforced concrete (CFSTRC) columns subjected to ISO-834 standard fire vol.17, pp.4, 2013, https://doi.org/10.1007/s13296-017-1223-8
  3. Analysis on Extension Length of Shape Steel in Transfer Columns of SRC-RC Hybrid Structures vol.18, pp.3, 2013, https://doi.org/10.1007/s13296-018-0038-6
  4. Failure Sensitivity Analysis of Tall Moment-Resisting Structures Under Natural Fires vol.16, pp.12, 2018, https://doi.org/10.1007/s40999-017-0248-x
  5. On the interaction between span length and opening ratio of RC frames under natural fires vol.171, pp.6, 2013, https://doi.org/10.1680/jstbu.17.00044
  6. Observation on microstructure and shear behavior of mortar due to thermal shock vol.121, pp.None, 2021, https://doi.org/10.1016/j.cemconcomp.2021.104106