A Real-Time Hybrid Fire Simulation Method Based on Dynamic Relaxation and Partitioned Time Integration

AbstractThe 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 intern...

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Bibliographic Details
Published in:Journal of engineering mechanics 2020-09, Vol.146 (9)
Main Authors: Abbiati, Giuseppe, Covi, Patrick, Tondini, Nicola, Bursi, Oreste S, Stojadinović, Božidar
Format: Article
Language:English
Subjects:
Algorithms
Computer simulation
Creep (materials)
Data exchange
Equations of motion
Finite element method
Geometric accuracy
High temperature
Internal forces
Real time
Simulation
Software reuse
Steel frames
Strain rate
Stress relaxation
Substructures
Technical Papers
Temperature dependence
Testing time
Time dependence
Time integration
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Summary:AbstractThe 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.
ISSN:0733-9399
1943-7889
DOI:10.1061/(ASCE)EM.1943-7889.0001826