EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF WATER-COOLED Q355 STEEL AFTER BEING SUBJECTED TO HIGH TEMPERATURE

YANG Caijun; ZHANG Chuntao

doi:10.13204/j.gyjzG21022608

Volume 51 Issue 11

Mar. 2022

Turn off MathJax

Article Contents

Article Navigation > INDUSTRIAL CONSTRUCTION > 2021 > 51(11): 165-170,38

YANG Caijun, ZHANG Chuntao. EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF WATER-COOLED Q355 STEEL AFTER BEING SUBJECTED TO HIGH TEMPERATURE[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(11): 165-170,38. doi: 10.13204/j.gyjzG21022608

Citation:

YANG Caijun, ZHANG Chuntao. EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF WATER-COOLED Q355 STEEL AFTER BEING SUBJECTED TO HIGH TEMPERATURE[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(11): 165-170,38. doi: 10.13204/j.gyjzG21022608

Citation:

PDF( 5856 KB)

EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF WATER-COOLED Q355 STEEL AFTER BEING SUBJECTED TO HIGH TEMPERATURE

doi: 10.13204/j.gyjzG21022608

YANG Caijun,
ZHANG Chuntao^,

School of Civil Engineering and Architecture, Southwest University of Science and Technology,Mianyang 621010, China

Received Date: 2021-02-26
Available Online: 2022-03-29

Abstract

Abstract

The Chinese National Standard High Strength Low Alloy Structural Steels(GB/T 1591-2018) requires that Q345 steel must be replaced by Q355 steel from February 1, 2019. Its residual mechanical properties after a fire are the key indicators for post-fire safety evaluation. As a widely-used fire extinguishing method in fire, water cooling is the fastest and most efficient firefighting method. Therefore, a uniaxial tensile test was conducted on the domestic Q355 steel specimens after water cooling from high temperature. The stress-strain curves and related mechanical properties of Q355 steel after water cooling from high temperature were obtained, and the variations of the residual mechanical properties of Q355 steel after water cooling high temperature were analyzed. The differences in mechanical properties of Q355 steel and Q235, Q460 and Q690 steels after cooling from high temperatures were also compared and analyzed. The results showed that when the heating temperature was lower than 600 ℃, the mechanical properties of Q355 steel had relatively small changes, and the maximum changes in yield strength and elastic modulus did not exceed 10%. When the temperature exceeded 600 ℃, the yield strength of Q355 steel after being immersed in water was cooled. And the ultimate strength increased with the increase of temperature, but the elongation decreased with the increase of temperature. After cooling from high temperatures, the Q355 steel had similar changes with Q235, Q460 and Q690 steels in mechanical properties, but the specific change range had differences. Finally, based on the test results, a mathematical model of the change in mechanical parameters of Q355 steel cooled by water was established. This model could be used to effectively evaluate the mechanical properties of Q355 steel after fire.
- Q355 steel,
- high temperature,
- mechanical property,
- immersion cooling,
- mathematical model

FullText(HTML)

References(16)

References

[1]	潘韵,焦远帆,仵桂仓,等.我国钢结构的应用与发展前景[J].现代经济信息,2018(1):349.
[2]	LI G Q,LYU H B,ZHANG C.Post-Fire Mechanical Properties of High Strength Q690 Structural Steel[J].Journal of Construction Steel Research,2017,132:108-116.
[3]	张有桔,朱跃,赵升,等.高温后不同冷却条件下钢材力学性能试验研究[J].结构工程师,2009,25(5):104-109.
[4]	陈光鹏,张春涛.泡沫灭火后Q460高强钢力学性能试验研究[J].材料导报,2021,35(6):6151-6156.
[5]	张春涛,金汉林,朱立.高温自然冷却后Q345钢材疲劳性能试验研究[J].建筑结构学报,2020,41(10):78-85.
[6]	中国国家标准化管理委员会.金属材料拉伸试验第1部分:室温试验方法:GB/T 228.1-2010[S].北京:中国标准出版社,2010.
[7]	SAJID H U,KIRAN R.Influence of Stress Concentration and Cooling Methods on Post-Fire Mechanical Behavior of ASTM A36 Steels[J].Constr.Build.Mater,2018,186:920-945.
[8]	BALESHAN B,MAHENDRAN M.Numerical Study of High Strength LSF Floor Systems in Fire[J].Thin-Walled Structures,2016,101:85-99.
[9]	SAJID H U,KIRAN R.Post-Fire Mechanical Behavior of ASTM A572 Steels Subjected to High Stress Triaxialities[J].Engineering Structures,2019,191:323-342.
[10]	ZHOU H,WANG W,WANG K,et al.Mechanical Properties Deterioration of High Strength Steels After High Temperature Exposure[J].Construction and Building Materials,2019,199:664-675.
[11]	陈建锋,曹平周.高温后结构钢力学性能试验[J].解放军理工大学学报(自然科学版),2010,11(3):328-333.
[12]	WANG W,LIU T,LIU J.Experimental Study on Post-Fire Mechanical Properties of High Strength Q460 Steel[J].Journal of Construction Steel Research,2015(114):100-109.
[13]	LI G Q,LYU H,ZHANG C.Post-Fire Mechanical Properties of High Strength Q690 Structural Steel[J].Journal of Construction Steel Research,2017(132):108-116.
[14]	KANG L,SUZUKI M,GE H,et al.Experiment of Ductile fracture Performances of HSSS Q690 After a Fire[J].Journal of Construction Steel Research,2018,146:109-121.
[15]	LU J,LIU H,CHEN Z,et al.Experimental Investigation into the Post-Fire Mechanical Properties of Hot-Rolled and Cold-Formed Steels[J].Journal of Construction Steel Research,2016,121:291-310.
[16]	中国国家标准化管理委员会.低合金高强结构钢:GB/T 1591-2018[S].北京:中国标准出版社,2018.