Fire Science and Technology
Online ISSN : 1882-0492
Print ISSN : 0285-9521
ISSN-L : 0285-9521
41 巻, 1 号
  • Quoc Tuan Phan, Mamoru Kohno, Yukio Murakami, Hoang Long Nguyen
    2022 年 41 巻 1 号 p. 1-20
    発行日: 2022年
    公開日: 2022/08/26
    ジャーナル フリー
    Creeps is a significant component affecting steel's behavior at elevated temperatures. This paper describes an approach for using Abaqus finite element models to investigate the creep behavior of high strength steel H-SA700 with a yield strength of at least 700 MPa under high temperature conditions. The creep models developed in this research were used to characterize the creep behavior of steel column. They were based on a set of tensile tests conducted at temperatures ranging from 23 °C to 600 °C under constant temperature conditions. The mechanical properties of steel were adopted from the tensile test specified by JIS G 0567. The results of the tensile tests indicated that creep effects occur when the temperature of steel exceeds 400 °C and the creep effect is regarded to be strongest at 500 °C. Additionally, a user subroutine CREEP was designed to account for the creep effect of the high strength steel H-SA700. The factors affecting the time-dependent behavior of high strength steel, including the initial imperfection of columns, have been explored. The thermal expansion coefficients of this steel have been also identified. Taking creep behavior into account, it could be able to reasonably simulate the behavior of H-SA700 column during a fire test. Furthermore, this paper develops and explains a process for determining steel creep parameters without creep tests, which can be used to forecast the time-dependent behavior of other steel structures.
  • Vyto Babrauskas
    2022 年 41 巻 1 号 p. 21-31
    発行日: 2022年
    公開日: 2022/08/26
    ジャーナル フリー
    The Cone Calorimeter—ISO 5660 and ASTM E1354—has been the primary bench-scale test for measuring the heat release rate for fires ever since the early 1990s. The technical details of how to construct and operate the instrument has been well documented in the standards, in reports, and in published papers. But the background for its development had not been earlier published. Because the Cone Calorimeter represented a ground-breaking, new approach to heat release studies, the present paper describes some of the historical context and laboratory developments which led to the invention of the calorimeter.