ISEE: Internet-based Simulation for Earthquake Engineering Part (I): The Database Approach

1. ISEE: Internet-based Simulation for Earthquake EngineeringPart (I): The Database Approach Yuan-Sen YANG, Shiang-Jung WANG, Kung-Juin WANG, Keh-Chyuan TSAI and Shang-Hsien HSIEH Joint NCREE/JRC Workshop Int’l Collaboration on Earthquake Disaster mitigation Research, Nov. 17-18, 2003

2. Related Research Work • Japan-Korea research • Networked real experiment in Japan (1998) • Networked simulated test in Korea (2000) • Networked simulated test between Japan and Korea (2001) • ED-net in E-Defense (Japan) (to be completed by 2005) • NEES project in US • 15 experiment sites with high performance Internet • To integrate experimentation, computation, theory, databases, and model-based simulation • To be completed by Sep., 2004.

3. Laboratories in Taiwan NCREE • Present: • Earthquake engineering laboratories distribute in Taiwan • Laboratories have diverse characteristics • Future challenge: • Collaborative experiments • Resource sharing NTU NTUST NCTU NCU NCHU NCNU NCKU NKFUST

4. ISEE Today • Application Protocol Approach • Communicating by TCP/IP commands • Database Approach • Communicating by SQL commands

5. Overview of Database Approach

6. Data Center • Data Center • A Database server • Microsoft SQL Server • A WWW interface • Microsoft IIS • A C++ class to communicate with Data Center • For the Facility Controllers and Analysis Engine to access data in the Data Center through Internet. • Tested on MS Visual C++ 6.0

7. Analysis Engine • Analysis Engine • OpenSees • a finite element program developed by PEER, USA (http://opensees.berkeley.edu/ ) • A user-defined element type • With user-defined initial stiffness, damping, and mass matrices of the specimen. • Communicates the experiment-analysis interaction data between OpenSees and Data Center

8. Facility Controllers • Facility Controller • A C++ program accessing the Data Center and controlling the facilities • Developed Facility Controllers • NCREE actuator controller • MTS Flex Test IIm controller • NTU actuator controller • MTS 407 controller • Other Facility Controllers • Different controllers in different laboratories NCREE actuator controller

9. Three-Layer Concept • Three-layer concept

10. Network Fault Tolerance

11. A BRB Frame Test (1/2) • A steel Buckling-Restrained-Brace frame (BRB) BRB frame at NCREE Network configuration of BRB test

12. A BRB Frame Test (2/2) • A substructure pseudo-dynamic test • Data Center:NCREE • Facility Controller:NCREE • Analysis Engine:Stanford Univ. • # of time steps: 2000 (10 sec.) • Total experiment time: 46 min 4 sec. (1.4 sec per time step) • Nearly 70% for network and database • Nearly 30% for facility controlling

13. DSCFT Experiment (1/2) Analysis model of a 4-pier bridge Concrete infilled Bi-axial controlled DSCFT column Double tube

14. DSCFT Experiment (2/2) At NCREE Lab. At NTU Lab.

15. RCS Frame Experiment • The RCS experiment • A single-site experiment • Data sharing via WWW • Real-time data plot • Real-time video Real-time data plot Real-time video image Network configuration of RCS test (Available at http://RCS.ncree.gov.tw)

16. ISEE: Future • Basic components

17. ISEE: Future Security Message board/ Messenger Video stream Database File transferring Visualization (Compound images)

18. ISEE: Future NCREE • ISEE Grid NTU NTUST NCTU NCU NCHU NCNU NCKU NKFUST

19. International EE Network • International Collaborations

20. Conclusions • ISEE: A prototype of an Internet-based environment is developed for collaborative networked pseudo-dynamic tests. • Reasonable elapsed time of networked pseudo-dynamic tests among laboratories at different locations. • Several tests present the feasibility of transnational collaborative experiments. • Future ISEE needs more efforts and cooperation.