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Double-shear tests of high-strength structural bolts at elevated temperatures
R M Peixoto1, M S Seif2, L C M Vieira1
1University of Campinas, Campinas, Brazil.
Fire Safety Journal
|October 31, 2024
Summary
This study tested high-strength structural bolts (A325, A490) under elevated temperatures and shear loads. Results reveal significant degradation in mechanical properties, crucial for fire safety analysis.
Area of Science:
- Structural Engineering
- Materials Science
- Mechanical Engineering
Background:
- Behavior of high-strength structural steel under elevated temperatures, particularly shear loading, is not well-documented.
- Understanding bolt performance during fire events is critical for structural integrity and safety assessments.
Purpose of the Study:
- To investigate the shear behavior of high-strength structural bolts (A325 and A490) at elevated temperatures.
- To characterize the degradation of mechanical and material properties of these bolts as temperature increases.
Main Methods:
- Conducted double shear loading tests on A325 and A490 bolts.
- Tested three bolt diameters (19 mm, 22 mm, 25.4 mm) at five temperatures (20 °C, 200 °C, 400 °C, 500 °C, 600 °C).
- Performed at least three tests for each parameter combination.
Main Results:
- Quantified the degradation in stiffness, strength, and deformation at fracture for high-strength bolts at elevated temperatures.
- Provided experimental data filling a critical knowledge gap in the literature.
Conclusions:
- Established the shear behavior of high-strength structural bolts under fire conditions.
- Detailed the impact of increasing temperatures on the mechanical and material properties of structural bolts.
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