ISEE Internetbased Simulation for Earthquake Engineering Part I

ISEE: Internet-based Simulation for Earthquake Engineering Part (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

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.

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

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

Overview of Database Approach

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

Analysis Engine • Analysis Engine – Open. Sees • 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 Open. Sees and Data Center

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

Three-Layer Concept • Three-layer concept

Network Fault Tolerance

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

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

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

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

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)

ISEE: Future • Basic components

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

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

International EE Network • International Collaborations

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