Open AccessSimplified calculation of flexural strength deterioration of reinforced concrete T-beams exposed to ISO 834 standard fire
Author(s) -
Nguyễn Tất Thắng,
Nguyen Hai Viet
Publication year - 2021
Publication title -
khoa học công nghệ xây dựng
Language(s) - English
Resource type - Journals
eISSN - 2734-9489
pISSN - 2615-9058
DOI - 10.31814/stce.huce(nuce)2021-15(4)-11
Subject(s) - flexural strength , flange , eurocode , beam (structure) , structural engineering , parametric statistics , materials science , reinforced concrete , t beam , composite material , engineering , mathematics , statistics
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.