Simplified calculation of flexural strength deterioration of reinforced concrete T-beams exposed to ISO 834 standard fire

  • Nguyen Truong Thang Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering, 55 Giai Phong road, Hai Ba Trung district, Hanoi, Vietnam
  • Nguyen Hai Viet Consultancy Company Limited of Hanoi University of Civil Engineering, 55 Giai Phong road, Hai Ba Trung district, Hanoi, Vietnam
Keywords: beam, reinforced concrete, T-shaped, flexural strength, standard fire

Abstract

Reinforced concrete (RC) T-shaped cross-section beam (so-called T-beam) is a common structural member in buildings where beams and slabs are monolithically cast together. In this paper, a simplified calculation method based on Russian design standard SP 468.1325800.2019 is introduced to determine the flexural strength of RC T-beams when exposed to ISO 834 standard fire. The idea of 500oC isotherm method, which is stipulated in both Eurocodes (EC2-1.2) and SP 468, is applied associated with specifications of temperature distribution on T-beams’ cross sections and the temperature-dependent mechanical properties of concrete and reinforcing steel. A case study is conducted to explicitly calculate the flexural strength deterioration (FSD) of T-beams compared to that at ambient temperature. A calculation sheet is established for parametric studies, from which the results show that the FSD factor of RC T-beams is adversely proportional to the dimensions of the beam’s web and flange. However, the effect of these components of T-beams is not significant.

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Published
31-10-2021
How to Cite
Thang, N. T., & Viet, N. H. (2021). Simplified calculation of flexural strength deterioration of reinforced concrete T-beams exposed to ISO 834 standard fire. Journal of Science and Technology in Civil Engineering (STCE) - HUCE, 15(4), 123-135. https://doi.org/10.31814/stce.huce(nuce)2021-15(4)-11
Section
Research Papers