Multi-Site Soil-Structure-Foundation Interaction Test (MISST) PI: Bill Spencer, Illinois Co-PIs: Amr Elnashai, Dan Kuchma, Illinois Jim Ricles, Richard Sause, Lehigh Tarek Abdoun, Ricardo Dobry, RPI Researcher/Personnel: Sung Jig Kim, Curtis Holub, Naru Nakata, Hassan Radwan, Tommy Marullo, Sogata Roy

Overview  Pre-NEES R MISST; funding $30k per site, $90k total  Project is a demo that has the objective: To provide a realistic test bed application with which to verify and extend all components of NEESgrid as well as all components of the sites taking part in the distributed simulation

Basis  Communication between modules conducted through NTCP  Advanced analytical geotechnical modeling under dynamic loading  Advanced analytical structural modeling under dynamic loading  Advanced structural testing using multi-degrees-of-freedom testing facilities Aspect of the Simulation

UI-SIMCOR Design Concept  Hybrid simulation: Integration of analysis and experiments  Interoperability of modules: Number of experimental sites, analytical modules, and their role in the PSD test are not restricted.  NEESgrid compatibility: Data communication through NEES Tele- Operations Control Protocol (NTCP) UI-SIMCOR MUST-SIM Facility, UIUC

UI-SIMCOR Design Concept  Hybrid simulation: Integration of analysis and experiments  Interoperability of modules: Number of experimental sites, analytical modules, and their role in the PSD test are not restricted.  NEESgrid compatibility: Data communication through NEES Tele- Operations Control Protocol (NTCP) UIUC Lehigh UI-SIMCOR FEDEASLab Experiment User defined Matlab functions via API FEDEAS Lab

UI-SIMCOR Design Concept  NEESgrid compatibility: Data communication through NEES Tele- Operations Control Protocol (NTCP) UI-SIMCOR Courtesy of NEESit Updated protocols can be readily integrated into framework if API is maintained

Objectives  Connect three sites on line and run a structural-geotehcnical system that demonstrates the potential of NEES to investigate systems that could not be studied before  Harden simulation coordination software UI-SIMCOR and refine its capabilities  Secondary: Demonstrate that complex shear failure modes observed in the field (in this case, on the C-D 36, part of the I-10 Santa Monica Freeway in LA damaged by the 17 January 1994 Northirdge earthquake) can be duplicated in the NEES hybrid simulation environment Three Site Five Component Distributed Hybrid Bridge System

MISST Test Structure  The MISST structure is based on the Collector-Distributor 36 of the I-10 Santa Monica Freeway –Damaged during the 17 January 1994 Northridge Earthquake  Idealization of the original structure: –To utilize current NEES experimental facilities and for simplification –Large-scale NEES facilities of both UIUC and Lehigh University –Geotechnical modeling at RPI

Zeus-NL UI-SIMCOR UIUC Lehigh RPI OpenSees Multi-Site Simulation System NEESgrid Simulation Approach Configuration of MISST

Experimental Setup UIUC Lehigh

Input Motions and Test Sequence  Santa Monica City Hall Grounds – PGA=0.37g –Small Amplitude Test: 998 steps (4.99 sec) –Large Amplitude Test: 2354 steps (11.42 sec)  Newhall Fire – PGA=0.583g –Final (failure) Test: 1210 steps (6.05 sec) Northridge Earthquake Records Santa Monica Station Newhall Fire Station PGA: 0.583g

Final Test Results  Comparison with analytical prediction Significant Shear CrackFailureSecond Failure UIUCLehighUIUCLehighUIUC Step Displ. X (in) Force X (kips)  Comparison between UIUC and Lehigh piers UIUC Lehigh

Lateral Force - UIUC Load-sharing between UIUC and Lehigh During Testing UIUC Lehigh

Synchronized Still Image Cameras

High Resolution Video

Failure Modes LehighUIUC Illinois and Lehigh

Conclusions  The multi-site test of three sites, UIUC, Lehigh and RPI, for a five-component hybrid (testing-analysis) system was conducted successfully using UI-SimCor as a simulation coordinator.  The redistribution of forces between the two sites with bridge piers as either of the two suffered partial failure shows that full interaction was taking place between the distant sites, at each time step.  The failure modes obtained are similar to those observed in the Northridge earthquake, thus opening the door to formulating design and retrofitting approaches to avoid such failures in the future. Three Site Distributed Hybrid Bridge System