Vol. 15, No. 2, pp. 185-191 (2019)
FIRE RESISTANCE PERFORMANCE ANALYSIS OF HIGH STRENGTH STEEL
Q550 COLUMNS UNDER AXIAL COMPRESSION
Sheng-Gang Fan*, Shuai Li, Bing-Bing He, Lian-Lian Jia, and Run-Min Ding
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University,
School of Civil Engineering, Southeast University, Nanjing 210096, China;
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 04 June 2018; Revised: 09 September 2018; Accepted: 15 September 2018
DOI:10.18057/IJASC.2019.15.2.8
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ABSTRACT
With the improvement in steel production technology, high-strength steel, as a building material, has become a new current in civil engineering. To reveal the mechanical behavior of axially compressed high-strength steel Q550 (a nominal yield strength fy≥550 MPa) columns without axial constraint at elevated temperatures, the finite element method was used to establish several transient analysis models with the software ABAQUS. The accuracy of the finite element model was verified by comparison with the results of prior experiments. To investigate the mechanical behavior and failure mechanism of high-strength steel Q550 columns in fire, the fire resistance of Q550 columns was numerically simulated and analyzed based on effective finite element models. The effects of the parameters on the fire resistance of high-strength steel Q550 column with a rectangular hollow section under axial compression were studied with an emphasis on the load ratio, initial imperfection amplitude, slenderness ratio and sectional dimensions. The results indicate that the load ratio is the main factor affecting the fire resistance performance of high-strength steel Q550 columns.
KEYWORDS
High-strength steel Q550, Axial compression, Fire resistance performance, Critical temperature
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