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An Empirical Component-Based Model for High-Strength Bolts at Elevated Temperatures
Jonathan M Weigand1,2, Rafaela Peixoto3,4, Luiz Carlos Marcos Vieira3,5
1Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland, United States.
This study models high-strength structural bolts (grade A325 and A490) at elevated temperatures. The component-based model accurately predicts bolt strength and stiffness degradation in steel structures during fires.
Area of Science:
- Structural Engineering
- Materials Science
- Fire Safety Engineering
Background:
- High-strength structural bolts are critical components in steel building construction.
- Accurate modeling of bolt behavior at elevated temperatures is essential for fire safety assessments.
Purpose of the Study:
- To empirically derive mechanical properties of A325 and A490 bolts at high temperatures.
- To develop and validate a component-based model for predicting bolt behavior under fire conditions.
Main Methods:
- Component-based modeling approach.
- Empirical derivation of ultimate tensile strength and modulus of elasticity.
- Double-shear testing of 25 mm (1 in) diameter bolts at elevated temperatures.
Main Results:
- Derived temperature-dependent mechanical properties for A325 and A490 bolts.
- Validated component-based model accurately predicts shear strength and stiffness degradation.
- Model accounts for various bolt diameters and load reversal.
Conclusions:
- The developed component-based model effectively simulates the performance of high-strength bolts in fire scenarios.
- This research provides a valuable tool for assessing the fire resistance of steel structures.
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