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Fast Hybrid Simulation with Geographically Distributed Substructures

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Abstract

This is considered a historical resource. At the time it was developed (2003-2005), the FASTMOST project had the objective of exploring the capabilities of distributed testing, and the software developed was considered innovative. A key feature was the development of the NTCP secure communication protocol. New software packages, such as MUSTSIM and OpenFresco, have replaced the FASTMOST software for distributed testing that allow for better integration with multipurpose program for structural analysis. A distributed control strategy is presented that supported the implementation of hybrid (pseudodynamic) testing with geographically distributed substructures. The objectives of the distributed controller were: (1) to provide a scalable framework for multiple substructure testing at distributed sites and (2) to improve the reliability of the test results by minimizing strain-rate and force relaxation errors in the remote experimental substructures. The control strategy was based on a multi-threaded simulation coordinator combined with an event-driven controller at the remote experimental sites. The multi-threaded coordinator was applied to simultaneously load multiple remote substructures at different sites. The event-driven remote site controller allowed for the implementation of continuous hybrid simulation algorithms on distributed models where computation, network communication and other tasks may have had random completion times. The advantage of this approach was that the hold phase in conventional ramp-hold psudodynamic testing was minimized, if not eliminated. The effectiveness of this procedure was demonstrated by computing the earthquake response of a six-span bridge model with five remote experimental and numerical column substructures distributed within NEES facilities. Further, the distributed control strategy was implemented on NEESGrid to provide a secure network link between the distributed NEES equipment sites. Citation of a journal publication that resulted from this work:

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Researchers should cite this work as follows:

  • Gilberto Mosqueda; Bozidar Stojadinovic; Jason Hanley; Siva Mettupalayam; Andrei M Reinhorn (2013), "Fast Hybrid Simulation with Geographically Distributed Substructures," http://nees.org/resources/5685.

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