EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS Earthquake Engng Struct. Dyn. 2007; 36:2307–2323 Published online 27 June 2007 in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/eqe.729
ISEE: Internet-based Simulation for Earthquake Engineering—Part II: The application protocol approach Kung-Juin Wang1, † , Keh-Chyuan Tsai1, ∗ , Shiang-Jung Wang1 , Wei-Choung Cheng2 and Yuan-Sen Yang2 1 Department
of Civil Engineering, National Taiwan University, and National Center for Research on Earthquake Engineering, Taipei, Taiwan 2 National Center for Research on Earthquake Engineering, Taipei, Taiwan
SUMMARY This paper develops new techniques for integrating a number of different structural laboratories together through the Internet in order to jointly conduct a single structural experiment. A computer-networking platform, called Platform for Networked Structural Experiments (PNSE), was developed to achieve this goal. PNSE runs directly on top of the Transmission Control Protocol/Internet Protocol (TCP/IP). It is a multi-client system consisting of a number of client programs, which include one command generation program and a number of facility control programs, connected to a server program via TCP point-topoint connections across the Internet. An associated application protocol, called Networked Structural Experiment Protocol (NSEP), was developed to work with the PNSE. In addition to communication rules, the NSEP defines general experimental information, significant laboratory events, commands and signals, as well as obligated behaviours of all PNSE programs. Both domestic and transnational pseudo-dynamic (PSD) tests were performed to verify the validity and efficiency of the PNSE. Test results showed that on the PNSE: signals were correctly transmitted; significant laboratory events were promptly reflected; and data transmission was remarkably efficient, with the round-trip time (RTT) between Taiwan and the United States less than 0.1701 s. The characteristic of environment independency was also demonstrated through the successful collaboration of different facility control programs running on different operating systems. Copyright 2007 John Wiley & Sons, Ltd. Received 15 June 2006; Revised 16 May 2007; Accepted 17 May 2007 KEY WORDS:
internet; hybrid testing; ISEE; pseudo-dynamic; TCP/IP; application protocol
∗ Correspondence
to: Keh-Chyuan Tsai, Department of Civil Engineering, National Taiwan University, and National Center for Research on Earthquake Engineering, Taipei, Taiwan. † E-mail:
[email protected] Contract/grant sponsor: National Science Council; contract/grant number: NSC91-2711-3-319-200
Copyright
2007 John Wiley & Sons, Ltd.
