Experimental investigation of S690 high strength steel square and rectangular hollow section stub columns after exposure to fire

• Main Author: Goh, Jian Ming
• Other Authors: Zhao Ou
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2020
• Subjects: Engineering::Civil engineering::Structures and design
• Online Access: https://hdl.handle.net/10356/138486
• Institution: Nanyang Technological University

Presented in this project is the numerical as well as experimental investigation of the structural behaviour and material properties of S690 high strength steel (HSS) square hollow section (SHS) and rectangular hollow section (RHS) stub columns after being exposed to target elevated temperatures. This study is done on 3 cold-formed S690 HSS RHS and SHS which includes initial geometric imperfection measurements, coupon material tensile tests and stub column compressive test after being exposed to targeted elevated temperatures of 30 °C, 400 °C, 600 °C, 800 °C and 1000 °C, after which a numerical simulation programme was created to complement the study of the experimental data where a finite element model (FE) was initially developed to generate a variety of cross-section geometric size for parametric study. Due to the absence of design provisions for HSS structures after fire exposure, the ambient temperature design codes of Europe, America and Australia were used to evaluate post-fire performance of S690 HSS SHS and RHS stub columns. The findings concluded that all codified slenderness limits in all the 3 considered codes were found to be adequately accurate for cross section classifications of post-fire S690 RHS and SHS stub columns with the European and American code being able to safely predict compression resistances for non-slender cross-sections but unsafe for slender sections. The Australian standard was able to give consistent and accurate predictions for compression resistance of the cross sections of both slender and non-slender members for post-fire S690 HSS SHS and RHS stub columns.