Numerical Analysis of Segmental Post Tensioned Concrete Beams Exposed to High Fire Temperature

Authors

  • H. M. Hekmet Department of Civil Engineering, Al-Farabi University College, Iraq http://orcid.org/0000-0002-0985-5465
  • A. F. Izzet Department of Civil Engineering, University of Baghdad, Iraq
Volume: 9 | Issue: 5 | Pages: 4759-4768 | October 2019 | https://doi.org/10.48084/etasr.3059

Abstract

The main objective of this study is to characterize the main factors which may affect the behavior of segmental prestressed concrete beams comprised of multi segments. The 3-D finite element program ABAQUS was utilized. The experimental work was conducted on twelve simply supported segmental prestressed concrete beams divided into three groups depending on the precast segments number. They all had an identical total length of 3150mm, but each had different segment numbers (9, 7, and 5 segments), in other words, different segment lengths. To simulate the genuine fire disasters, nine beams were exposed to high-temperature flame for one hour, the selected temperatures were 300°C (572°F), 500°C (932°F) and 700°C (1292°F) as recommended by ASTM–E119. Four numerical models have been utilized to represent the unburned and the burned specimens at the three elevated temperatures. Calibration and simulation of the experimental work were conducted, while comparisons were made with the experimental results. These included the prestress effect, load-deflection relation under applied load, and load at failure of the reference beam and the beams after the exposure to fire.

Keywords:

burning temperature, fire flame, gradual cooling, segmental beam, numerical analysis

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References

M. A. Algorafi, A. A. A. Ali, I. Othman, M. S. Jaafar, M. P. Anwar, “Experimental study of externally prestressed segmental beam under torsion”, Engineering Structures, Vol. 32, No. 11, pp. 3528–3538, 2010 DOI: https://doi.org/10.1016/j.engstruct.2010.07.021

C. Sivaleepunth, J. Niwa, D. H. Nguyen, T. Hasegawa, Y. Hamada, “Shear carrying capacity of segmental prestressed concrete beams”, Doboku Gakkai Ronbunshuu E, Vol. 65, No. 1, pp. 63–75, 2009 DOI: https://doi.org/10.2208/jsceje.65.63

D. H. Nguyen, K. Watanabe, J. Niwa, T. Hasegawa, “Modified model for shear caryying capacity of segmental concrete beams with external tendons”, Doboku Gakkai Ronbunshuu E, Vol. 66, No. 1, pp. 53–67, 2010 DOI: https://doi.org/10.2208/jsceje.66.53

M. A. Al-Gorafi, A. A. A. Ali, I. Othman, M. S. Jaafar, M. P. Anwar, “Externally prestressed monolithic and segmental concrete beams under torsion: a comparative finite element study”, IOP Conference Series: Materials Science and Engineering, Vol. 17, Article ID 012041, IOP Publishing, 2011 DOI: https://doi.org/10.1088/1757-899X/17/1/012041

Y. N. Chan, X. Luo, W. Sun, “Compressive strength and pore structure of high-performance concrete after exposure to high temperature up to 800°C”, Cement and Concrete Research, Vol. 30, No. 2, pp. 247–251, 2000 DOI: https://doi.org/10.1016/S0008-8846(99)00240-9

C. S. Poon, S. Azhar, M. Anson, Y. L. Wong, “Comparison of the strength and durability performance of normal- and high-strength pozzolanic concretes at elevated temperatures”, Cement and Concrete Research, Vol. 31, No. 9, pp. 1291–1300, 2001 DOI: https://doi.org/10.1016/S0008-8846(01)00580-4

B. Georgali, P. E. Tsakiridis, “Microstructure of fire-damaged concrete. A case study”, Cement and Concrete Composites, Vol. 27, No. 2, pp. 255–259, 2005 DOI: https://doi.org/10.1016/j.cemconcomp.2004.02.022

F. Aslani, “Prestressed concrete thermal behaviour”, Magazine of Concrete Research, Vol. 65, No. 3, pp. 158–171, 2013 DOI: https://doi.org/10.1680/macr.12.00037

L. Zhang, Y. Wei, F. Au, “Mechanical properties of prestressing steel at elevated temperature and after cooling”, Australasian Conference on the Mechanics of Structures and Materials, Southern Cross University, Australia, December 9-12, 2014

A. H. Buller, M. Oad, B. A. Memon, S. Sohu, “24-hour Fire Produced Effect on Reinforced Recycled Aggregates Concrete Beams”, Engineering Technology and Applied Science Research, Vol. 9, No. 3, pp. 4213-4217, 2018 DOI: https://doi.org/10.48084/etasr.2764

U. Wickstorm, A Very Simple Method for Estimating Temperature in Fire Exposed Concrete Structures, Technical Report SP-RAPP 1986:45, Swedish National Testing Institute, 1986

Z. Wang, K. Tan, “Residual area method for heat transfer analysis of concrete-encased I-sections in fire”, Engineering Structures, Vol. 28, pp. 411-422, 2006 DOI: https://doi.org/10.1016/j.engstruct.2005.08.013

E. Ellobody, C. Bailey, “Modelling of unbonded post-tension concrete slabs under fire conditions”, Fire Safety Journal, Vol. 44, pp. 159-167, 2009 DOI: https://doi.org/10.1016/j.firesaf.2008.05.007

G. Liu, S. Quek, The Finite Element Method: A Practical Course, Butterworth-Heinemann, 2003

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How to Cite

[1]
H. M. Hekmet and A. F. Izzet, “Numerical Analysis of Segmental Post Tensioned Concrete Beams Exposed to High Fire Temperature”, Eng. Technol. Appl. Sci. Res., vol. 9, no. 5, pp. 4759–4768, Oct. 2019.

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