摘要
Abstract
When fire disaster occurs in the steel structure buildings,the mechanical properties of steel such as yield strength and elastic modulus decrease severely at high-temperature,which will lead to the decrease of steel structure's bearing capacity.So,it is particularly significant to investigate the mechanical properties of steel material at high-temperature.But for now,there is no unified formula for different types of steel to express the mechanical properties at high-temperature at home and abroad.This paper reviewed the research status of the steel mechanical properties at high-temperature at home and abroad,which including stress-strain curves,yield strength and elastic modulus,and so on,by contrasting the existing test results of ordinary steel,high-strength steel,and stainless steel with European standard Eurocode 3 (hereafter referred to as EC3) and domestic standard 《 Technical code for fire safety of steel structure in buildings》CECS200:2006 (hereafter referred to as technical code for fire safety),so as to evaluate the applicability of these standards.It can be seen form the results of the comparison,relative to the other stress-strain models,EC3 model is more flexible;the yield strength reduction factor at high temperature determined by the EC3 and technical code for fire safety is applicable to ordinary steel higher than 600 ℃,but it is unsafe for high strength steel and the ordinary steel below 600 ℃;The reduction factor of elastic modulus is suitable for ordinary steel but conservative for high strength steel;for the stainless steel,there is no unified calculation formula is given by EC3 and technical code for fire safety.关键词
高温/钢结构/力学性能Key words
high-temperature/steel structures/mechanical properties
