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Published on September 25, 2007

Author: Dabby


Demonstrating NEESgrid capabilities by altering the MOST model:  Demonstrating NEESgrid capabilities by altering the MOST model Garrett Erickson Dr. Christenson Colorado School of Mines Allen Au Dr. Johnson University of Southern California Dr. Mita Keio University 2004 REUJAT Program Outline:  Outline Background Setting up NEESgrid Node Altering MOST model Challenges in making changes Future Research Objectives Background: NEES and NEESgrid:  Background: NEES and NEESgrid Network for Earthquake Engineering Simulation 15 year, $100+ million NSF program Funded 'shared-use equipment sites' connected via the internet Created to share resources among institutions and make larger experiments possible Designed to promote collaboration within the earthquake research community Background: MOST experiment:  Background: MOST experiment Demonstrated NEESgrid capabilities Experiment consisted of geographically separate parts hybrid of computational and physical experiments - a computational model in the center and two physical columns on either side Setting up the NEESgrid Node: Computer Overview:  Setting up the NEESgrid Node: Computer Overview Three Computers NEESpop Matlab DAQ Setting up the NEESgrid node:NEESpop Computer:  Setting up the NEESgrid node: NEESpop Computer Installed prerequisite software Installed the NEESgrid NEESpop software Obtained NCSA certificates Ran tests to make sure installation was successful Setting up the NEESgrid node:Matlab Computer:  Setting up the NEESgrid node: Matlab Computer Setup Matlab on two computers Downloaded and installed prerequisite software Downloaded and installed NTCP Configured Matlab Tested NTCP and Matlab configuration Setting up the NEESgrid node:DAQ Computer:  Setting up the NEESgrid node: DAQ Computer Installed and configured LabView to communicate with the Matlab Tested communication with NEESpop Challenges in NEESgrid:  Challenges in NEESgrid Log files on the NEESpop were all in Japanese Matlab computer setup Firewall Instructions incomplete Experiment - Coupled Buildings:  Experiment - Coupled Buildings Original Experiment Variation of the MOST experiment Consists of two one story frames coupled by a rigid connection Rigid / Passive Damper Left Right Three Site Computational Simulation:  Three Site Computational Simulation Problems Encountered :  Problems Encountered Lack of any documentation Models too complicated for existing Mplugins Required reconfiguration to pass the correct output from each model to the Sim-Coordinator Errors related to model dimension Errors related to number of DOF, which led to matrix dimension mismatches Simplified Models:  Simplified Models Simplify the model or complicate the Mplugins Single DOF cantilever columns Future Research Objectives:  Future Research Objectives Continue to increase the complexity of the models Incorporate the physical model Change type of connection Passive damper model Existing Physical Model at Keio:  Existing Physical Model at Keio Collaborative Research:  Collaborative Research Coupled building experiment Existing 5 story frame model at Keio Cantilever column at CSM Modeled passive damper Eventually incorporate a controllable MR damper Concluding Remarks:  Concluding Remarks Hybrid experiments are very beneficial to coupled building research due the ease of modification and the money saving computational models. We hope to provide some documentation for the Matlab portion of NEESgrid to make it easier for end users to design and carry out their own experiments Acknowledgements:  Acknowledgements REUJAT, NSF, NEES Dr. Mita Dr. Dyke, Dr. Abdullah Dr. Christenson, Dr. Johnson Slide19:  Thank you for your kind attention! Any questions?

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