Experiment on Mechanical Properties of Domestic Ultrahigh Strength Steel Q890 at Elevated Temperatures(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2018年03期
- Page:
- 1-6
- Research Field:
- Publishing date:
Info
- Title:
- Experiment on Mechanical Properties of Domestic Ultrahigh Strength Steel Q890 at Elevated Temperatures
- Author(s):
- LI Guo-qiang; HUANG Lei; ZHANG Chao
- State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University
- Keywords:
- domestic ultra-high strength steel; high temperature; steady-state test; mechanical property; material model
- PACS:
- -
- DOI:
- -
- Abstract:
- By steady-state test, an experimental study was conducted on the mechanical properties of domestic ultra-high strength steel Q890 under different fire temperature. The mechanical properties, stress-strain curves and experimental phenomena at elevated temperatures were obtained. The experimental results were compared with high temperature material models determined by fire resistant design of steel structures and literature on ultra-high strength steel. In order to obtain the mathematical models for mechanical properties of Q890 at elevated temperature, polynomial model and high temperature material model proposed by National Institute of Standards and Technology were employed for fitting the experiment data. The results show that the specimens with different temperatures have different appearance characteristics after the tests and different basic shapes of stress-strain curves. When the temperature is below 500 ℃, the elastic modulus and strength slightly decrease, and the elongation changes little. When the temperature is over 500 ℃, the declines of elastic modulus and strength obviously accelerate, and the elongation increases rapidly. The material models can be used for fire resistance of Q890 steel structure.
Last Update: 2018-05-31