Experimental study on stress-strain-temperature models for structural steel

YANG Xiu-ying^1,2, ZHAO Jin-cheng¹

1.Dept.of Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China;2.School of Architecture and Civil Engineering,Liaocheng University,Liaocheng 252059,China



Abstract:

For the research on steel structure in fire,it is very important to determine the properties of structural steel at elevated temperature.Up to now,the high-temperature properties of material is believed to be related to only temperature state,which is not precise enough to simulate the behavior of steel structures under different combinations of heating,cooling,loading,and unloading.To analyze the influence of the temperature-load history on the steel properties,a series of tests were carried out under different temperature-load paths about steel Q235,which is widely used in steel structures in China.In this paper,the method to set the temperature-load paths was introduced;the variety regulation of steel properties changing with temperature was analyzed under different paths;according to experimental results,the formulas of elastic modulus and yield strength at elevated temperature were fitted,and the stress-strain-temperature 3D relationships of structural steel under different paths were presented.

Key words:  structure steel  high-temperature material test  temperature-load history  stress-strain-temperature relationship

DOI：10.11916/j.issn.1005-9113.2011.01.002

Clc Number:TG142.1

Fund: