isee: internet-based simulation for earthquake engineering part (i): the database approach yuan-sen...
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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
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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.
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Laboratories in Taiwan• Present:
– Earthquake engineering laboratories distribute in Taiwan
– Laboratories have
diverse characteristics
• Future challenge:– Collaborative
experiments
– Resource sharing
NCREE
NTU NTUST
NCU
NCHU
NCKU
NKFUST
NCTU
NCNU
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ISEE Today• Database Approach
– Communicating by SQL commands
FCM #1 FCM #2
ServerCGM
Camera Camera
PNSEcommandsresponses
Video server Video server Web server Database
Experimental data
Viewer #1 Viewer #2
FCM #1 FCM #2
ServerCGM
Camera Camera
PNSEcommandsresponses
Video server Video server Web server Database
Experimental data
Viewer #1 Viewer #2
FCM #1 FCM #2
ServerCGM
Camera Camera
PNSEcommandsresponses
Video server Video server Web server Database
Experimental data
Viewer #1 Viewer #2
FCM #1 FCM #2
ServerCGM
Camera Camera
PNSEcommandsresponses
Video server Video server Web server Database
Experimental data
Viewer #1 Viewer #2
• Application Protocol Approach– Communicating by
TCP/IP commands
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Overview of Database Approach
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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
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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
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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 l
aboratoriesNCREE actuator controller
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Three-Layer Concept
• Three-layer concept
WWWBrowser
UserLayer
MiddleLayer
DataLayer
WWWServer
Database
AnalysisEngine
FacilityController
Access Interface
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Network Fault Tolerance
Facility Controller
Analysis Engine
Workstation
Data Center
Experiment time
Restart output file
Network message passing File I/O
Network disconnection!
Step1 ... Step(i-1) Step i
Facility Controller
Analysis Engine
Workstation
Data Center
Experiment time
Restart output file
Network message passing File I/O
Step1 ... Step(i-1) Step i
Previousrestart file
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A BRB Frame Test (1/2)• A steel Buckling-Restrained-Brace frame (BRB)
BRB frame at NCREE
Data Viewers
Data Center
BRB Frame Facility Controller
Analysis Engine
Numerical model
Network configuration of BRB test
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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
Elapsed Time (each step) (sec.)
0.0
2.0
4.0
6.0
8.0
Time Step
Elapsed Time (each step) (sec.)
0.0
2.0
4.0
6.0
8.0
Time Step
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DSCFT Experiment (1/2)
NTU Lab. NCREE Lab.
Analysis EngineData Center
Concrete infilled
Double tubeBi-axial controlled
DSCFT column
Analysis model of a 4-pier bridge
C1 C2 C3 C4
B1 B2 B3
6m2m 2m
2.37m2.
37m
Real DSCFT specimenNumerical simulated component
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NTU Lab. NCREE Lab.
Analysis EngineData Center
DSCFT Experiment (2/2)
At NCREE Lab. At NTU Lab.
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RCS Frame Experiment
• The RCS experiment– A single-site experiment
– Data sharing via WWW
• Real-time data plot
• Real-time video
Network configuration of RCS test
Real-time video image
Real-time data plot
(Available at http://RCS.ncree.gov.tw)
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ISEE: Future• Basic components
Analysis
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ISEE: Future
Security
Database
Video stream
Visualization
Message board/Messenger
File transferring
(Compound images)
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ISEE: Future
• ISEE Grid NCREE
NTU NTUST
NCU
NCHU
NCKU
NKFUST
NCTU
NCNU
Analysis
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International EE Network• International Collaborations
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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.