Numerical Analysis of Segmental Post Tensioned Concrete Beams Exposed to High Fire Temperature
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
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
How to Cite
MetricsAbstract Views: 297
PDF Downloads: 139
Authors who publish with this journal agree to the following terms:
- Authors retain the copyright and grant the journal the right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) after its publication in ETASR with an acknowledgement of its initial publication in this journal.