A Real-Time Hybrid Fire Simulation Method Based on Dynamic Relaxation and Partitioned Time Integration
Publication: Journal of Engineering Mechanics
Volume 146, Issue 9
Abstract
The use of simplified numerical substructures in hybrid fire simulation is clearly advantageous as long as the resulting simulation accuracy is sufficient. However, excluding geometrical and material nonlinearities from the numerical substructure might make a significant difference in internal force redistribution and reduce the simulation accuracy beyond acceptable levels. Also, materials at a high temperature very often exhibit time-dependent behavior, including strain-rate dependency, high-temperature creep, and stress relaxation, which prohibit the use of extended testing time scales. This standpoint motivated the development of the real-time hybrid fire simulation method presented in this paper. Dynamic relaxation is proposed to solve the static response of the hybrid numerical-experimental fire simulation. As an equivalent dynamic solution method, dynamic relaxation allows for coupling substructure equations of motion by using a partitioned time integration approach. Minimal data exchange between substructures and negligible computational overhead plus ease of reusability of verified finite-element software makes the proposed algorithm suitable for coordinating real-time hybrid fire simulations. The hybrid fire simulation of a virtual steel frame case study is reported as a validation example.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The first author wishes to acknowledge the Swiss Government for funding this research through the Swiss Government Excellence Scholarship Ref. 2014.0588 devoted to the “Development of Advanced Temperature Control Strategies for Hybrid Fire Simulation.” This work has received funding from the European Union’s Horizon 2020 research and innovation program under the SERA Grant Agreement No. 730900 and the related TA project EQUFIRE. Finally, the authors also acknowledge funding from the Swiss Federal Institute of Technology (ETH) Zurich, and the Italian Ministry of Education, University and Research (MIUR) in the frame of the Departments of Excellence Initiative 2018–2022 attributed to DICAM of the University of Trento.
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Published In
Journal of Engineering Mechanics
Volume 146 • Issue 9 • September 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Apr 24, 2019
Accepted: Apr 7, 2020
Published online: Jul 9, 2020
Published in print: Sep 1, 2020
Discussion open until: Dec 9, 2020
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