An Analytic Method for the Residual Strength Evaluation of Fire-Damaged Reinforced Concrete Beam

  • Park, Won-jun (Department of Architecture, Graduate School of Hanyang University) ;
  • Park, Ki-bong (Department of Architectural Engineering, Kangwon National University) ;
  • Lee, Han-seung (Department of Architecture, Hanyang University)
  • Received : 2008.04.10
  • Published : 2008.12.30

Abstract

This study is to get the proper evaluation of the residual property of reinforced concrete beam exposed to fire. This study focused on the strength resistance and analytical evaluation of RC members exposed high temperature. And this study is the basis analytical research to conduct the other studies. To analysis by the finite element method, the Total-RC program was used to analysis it and the Total-Temp program was also used to analysis the temperature distributions at the section. All of results were compared with the pre-existing experimental data of simple supported beam. Using it, the parameters influencing the structural capacity of the high temperature-damaged RC members and residual strength estimation are investigated. The temperature distribution and the structural capacity at the section are calculated in this step. An application of this method is compared with the heating test result and residual property test for simple supported beam which is subjected to ISO 834 test fire. The results of this study are as follows; 1) The loads-displacement relationship of RC beam, considering initial thermal stress of cross section and heat transfer analysis are estimated comparing analytical value with pre-existing experimental results. 2) by the heating time (0, 1, 2 hours), the results of analysis with parameters show that the load capacity exposing at fire is affected.

Keywords

References

  1. Eurocode 2 (2004): 'Design of Concrete Structures'. BS EN 1992_1_2: 2004 Part 1_2: General rules- Structural fire design
  2. Kim, H.Y. (2005) 'An Experimental Study on the Mechanical Properties by Compressive Strength Areas at High Temperature' Journal of AIK, Vol.21, No.7:55-66
  3. Lie, T.T. (1992), Structural Fire Protection, ASCE Manuals and Reports on Engineering Practice No. 78, American Society of Civil Engineering, New York
  4. Kang, S.W. (2004), 'Analysis of the reinforced concrete flexural members subjected to high temperatures.' Graduate School of Seoul Univ.
  5. Han, S.H. and Lee, S.H. (2004) 'The Experimental Study on the Strength Reduction of the Reinforced Concrete Beam and Column Members under Heating Test' Journal of AIK , Vol.20, No.7:3-12
  6. ISO 834-1 (1999), Fire-resistance tests-Elements of building construction-Part 1: General requirements
  7. ACI 216R-89 (2001), 'Guide for Determining the Fire Endurance of Concrete Elements'
  8. KICT (2000), Fire Resistance Structure Research(2), Ministry of Construction & Transportation, 84-87
  9. Han, S.H. and Lee, S.H. (2004) 'A study on the flexural strength with thermal stress of the reinforced concrete members for the high temperature.' Journal of AIK, Vol.20, No.11:59-66
  10. Sim, J.S. (2003) 'Evaluation of bond strength of a firedamaged reinforced concrete structure'. Journal of KCI, Vol.15 No.2:211-214
  11. C. Chaing and C. -L. Tsai (2003), 'Time-temperature analysis of bond strength of a rebar after fire exposure', Cement and Concrete Research: 1651-1654