Bozidar Stojadinovic Gilberto Mosqueda UC Berkeley NEES FAST-MOST

2 Objectives  Improve reliability of results from geographically distributed hybrid simulations  Increase speed of test Reduce the time it takes to load experimental substructures Minimize network communication  Implement algorithms for continuous loading of experimental substructures

3 Challenges  Continuous methods are based on real- time algorithms Network communication time is random Integration task time may be random  Need fault-tolerant mechanism to deal with uncertainties Occasional event: network delays Rare event: integrator crashes or communication with remote site is lost.

4 Current Status  Simulation only code is complete Code is adapted from July MOST developed at UIUC Structural model changed to 6-span bridge model  Deck and one column are numerical models  Other 4 columns are independent experimental models  Simple to add or remove number of experimental sites Event-driven model in Simulink was distributed to ‘fast_hybrid’ list in December  Remaining tasks Need to determine who is involved as experimental and computations sites; schedule a simulation run Sites to implement event-driven model and link to MOST code and experimental setup Optimize NTCP for speed, relax constraints on control of test from ‘simulation coordinator’ point of view – to discuss

5 Structural Model  6-span bridge model  Span and one column are numerical models  Other 4 columns are experimental models Experimental Sites: Berkeley Boulder UIUC Buffalo Lehigh Computational Sites: UIUC/NCSA

6 Current NTCP Configuration Source:MOST presentation (Spencer et al.) m1m1 f1f1 f2f2 NCSA Computational Model SIMULATIONCOORDINATOR UIUC f1f1 m1m1 f2f2 U. Colorado Computational Model TCP/IP Link

7 Proposed NTCP Configuration f2f2 UIUC Computational Model m1m1 f1f1 f2f2 NCSA SIMULATIONCOORDINATOR f1f1 m1m1 U. Colorado Computational Model TCP/IP Link

8 Comparison of NTCP Configuration  Existing Protocol: 1. propose(comp) getResponse(comp) 2. Execute(comp) getResponse(comp) 3. For No of SITES propose(expsite) getResponse(expsite) 4. For No of SITES querry(expsite) getResponse(expsite) 5. For No of SITES execute(expsite) 6. For No of SITES getResponse(expsite)  Proposed Protocol with integrated simulation coordinator and computational site: 1. For No of SITES propose(expsite) 2. For No of SITES getAcceptResponse(expsite) 3. For No of SITES if accepted getResponse(expsite) else pause simulation

9 Conclusion  Which sites will be involved as experimental sites; provide specimen characteristics  Sites must try out the Matlab Fast-MOST code and Simulink model and verify if they can run it; provide comments or suggestions  Develop time line for doing a computer-only simulation  Develop a time line for doing a hybrid simulation