1. OpenSees Capabilities & Integration with NEES Silvia Mazzoni, Frank McKenna, Gregory L. Fenves University of California, Berkeley NEES Annual Meeting – June 2008

2. Silvia Mazzoni, NEESam 2008 Introduction OpenSees & NEES goals: Large-Scale Structural and Geotechnical Simulations Community support and development –open-source software architecture –NEES-researcher contributing to OpenSees model/solution library Education and training of academics and industry in: –Structural and geotechnical mechanics and modeling –Advanced computing and simulation Cyberinfrastructure –Web portal –Upload simulation data to NEEScentral –High-performance computing –Databases –Visualization tools IT integration

3. Silvia Mazzoni, NEESam 2008 Numerical-Simulation Update Released in April 2008: –OpenSees 2.0 Standalone single-processor executable –OpenSeesSP HPC Application for large models. –OpenSeesMP HPC Application for both large models and Monte-Carlo type simulations –BuildingTcl Library of Tcl procedure for building-frame simulation

4. Silvia Mazzoni, NEESam 2008 Structural Modeling UniaxialMaterial Contributions in 2007-2008: –SMA Material: superelastic shape-memory alloy material model Davide Fugazza, Reginal DesRoches, Ferdinando Auricchio – Italy –SelfCentering Material – Flag-Shaped Hysteresis with Slip Deformation and Bearing Jeff Erochko -- U. Toronto, Canada –Hyperbolic Gap Material Matthew Dryden, Patrick Wilson -- UCB & UCSD –Concrete06 – represent concrete behavior in membrane elements Leo Massone, Kutay Orakal, John Wallace – UChile BounTurkey UCLA –Concrete07 – Chang & Mander’s 1994 Concrete Model Sri Sritharan, Jonathan Waugh -- Iowa State U Element Contributions in 2007-2008 –Flexure-Shear Interaction Displacement-Based Beam-Column Element Leo Massone, Kutay Orakal, John Wallace – UChile BounTurkey UCLA –Fiber Section for Interaction Model Leo Massone, Kutay Orakal, John Wallace – UChile BounTurkey UCLA –zeroLengthContact Element Gang Wang & Nicolas Sitar – Geometrix & UCB

5. Silvia Mazzoni, NEESam 2008 Large-Scale Building-Frame Nonlinear Time-History Analyses Tall-Building Initiative Colleen McQuoid, Jack P. Moehle, UC Berkeley Building: –Reinforced concrete frame structure –22 Stories above ground w/ 3 stories below 2-D Model: –Includes 1 lateral frame and 2 gravity frames –Approx. 340 Nodes, 575 Elements –Nonlinear BeamColumns, Beams with Hinges, and Zero-Length Elements –Uniaxial and Fiber Sections 57 pairs of ground motions X 4 scaling factors = 456 analyses –Approx. 260 recorders each recording up to 26 locations –560 GB of results –Post-processing in Matlab to investigate correlation between building demand parameters and ground motion parameters Use: OpenSeesMP – parallel version of OpenSees – on NEESit Teragrid Colleen McQuoid UC Berkeley

6. Silvia Mazzoni, NEESam 2008 Numerical Simulation of Bridge Model Numerical simulation of laboratory-model response Unique to OpenSees: perform an eigenvalue each shaking table test  Track the K degradation  Measure structural damage Matthew Dryden UC Berkeley 0 0.1 0.2 0.3 0.4 0.5 0.6 Period (sec) Test 2-Span Bridge Fundamental Period in the Transverse Direction NEESR-SG Seismic Performance of Bridge Systems with Conventional and Innovative Materials PI: Professor Saiid Saiidi, University of Nevada, Reno co-PI: Professor Gregory L. Fenves, UC Berkeley Student performing numerical simulation: Matthew Dryden, UC Berkeley 4-Span Shaking Table Test at Univ. of Nevada, Reno (graphic provided by Robby Nelson)

7. Silvia Mazzoni, NEESam 2008 2-Span Bridge-Model Comparison Global Response: Drift Ratio Local Response: Curvature Matthew Dryden UC Berkeley

8. Silvia Mazzoni, NEESam 2008 Type of Geotechnical Problems that can be solved using OpenSees Static Problems –Deformation analyses (1D, 2D, or 3D) –Consolidation problems –Soil-structure interaction problems Shallow foundations (e.g. bearing capacity, deformation) Pile foundations (e.g. vertical and lateral capacity) Dynamic (earthquake problems) –Free-field analysis –Liquefaction-induced problems –Soil structure interaction problems (e.g. response of pile foundations, bridge bents, or complete structures embedded in soils to earthquake excitations) Key Contributors to Geotechnical modeling UC Davis: B. Jeremic –Computational Geomechanics –Free-field vs. SSI UC San Diego: A. Elgamal –Large-Scale Simulations Pedro Arduino University of Washington, 2007

9. Silvia Mazzoni, NEESam 2008 UCD: Computational Geomechanics Research UCD numerical simulation platform is based on: Uses OpenSees framework UCD Computational Geomechanics libraries: –nDarray (tensor, matrix and vector manipulations) –FEMtools (dry and saturated elements (u–p–U, u–p) –Template3DEP (elastic–plastic algorithms and material models, Dafalias Manzari for example... ) –I Plastic–Domain–Decomposition (PDD, for parallel computing) –Domain Reduction Method (DRM, for seismic input) Equation solvers (PETSc (LBL), UMFpack (UF), ColSol (UCD)) Graph partitioner ParMETIS (UMN) Boris Jeremic UC Davis, 2008

10. Silvia Mazzoni, NEESam 2008 Example Application: 3D Liquefaction Simulation of Bridge Pier–Pile in Sloping Liquefied Soils Boris Jeremic UC Davis, 2008

11. Silvia Mazzoni, NEESam 2008 Bilinear Kent-Scott-Park model PEER Testbed: Nonlinear Soil-Foundation-Structure Interaction Transverse and Longitudinal Response Ahmed Elgamal UC San Diego, 2008 UCSD: A. Elgamal, J. Conte, Z. Yang, L. Yan Humboldt Bay Middle Channel Bridge

12. Silvia Mazzoni, NEESam 2008 OpenSees Petascale Computing and Visualization 30,237 nodes 1,140/280 linear/nonlinear BC elements 81 linear shell elements 23,556 solid brick elements 1,806 zero-length elements Ahmed Elgamal UC San Diego, 2008

13. Silvia Mazzoni, NEESam 2008 OpenSeesPL: 3D Soil Island and Pile/Pile-group user-Interface  A 3D seismic analysis tool for single pile in a half-space Soil strata Pile Soil strata definition Input motion definition Pile definition Mesh viewer Model builder Pushover option http://cyclic.ucsd.edu/openseespl/ Ahmed Elgamal UC San Diego, 2008

14. Silvia Mazzoni, NEESam 2008 High-Performance Computing Frank McKenna, UC Berkeley Two OpenSees interpreters: –OpenSeesSP: Large models. –OpenSeesMP: Large models Monte-Carlo type simulations. Parallel applications run on: –Windows multicore machine or windows cluster –Mac multicore machine or mac cluster –Teragrid machine Training workshop held in April 2008 –47 participants, of which 16 NEES-affiliated & 10 industry- affiliated

15. Silvia Mazzoni, NEESam 2008 Example Usage OpenSeesMP: Steel Building Parameter Study 7200 ground-motion records Single Processor: 2 min/record = 240 hrs/7200 records (10 days) 2000 Processors on teragrid: ~3.6 min/record = <15 minutes/7200 records Farzin Zareian UCIrvine, 2008

16. Silvia Mazzoni, NEESam 2008 OpenSees & NEESit Integration NEEScentral RDV NEESforge SimPortal SDSC Teragrid & Co.

17. Silvia Mazzoni, NEESam 2008 SimPortal T. Haupt, A. Kalyanasundaram, I. Zhuk Mississippi State University T. Haupt Mississippi State University

18. Silvia Mazzoni, NEESam 2008 OpenSees SimPortal Model: Edit Check Visualize Submit Monitor Results T. Haupt Mississippi State University

19. Silvia Mazzoni, NEESam 2008 & Silvia Mazzoni, UC Berkeley BuildingTcl and BuildingTclViewer provide a library of Tcl procedures that can be used within OpenSees to: –Build a simulation-model library for building frames –Visualize models –Run simulations interactively –View results interactively

20. Silvia Mazzoni, NEESam 2008 BuildingTclViewer: Results -- Static Pushover RC Frame

21. Silvia Mazzoni, NEESam 2008 BuildingTclViewer: Results – Dynamic Time History RC Frame

22. Silvia Mazzoni, NEESam 2008 BuildingTclViewer: Results Diagrams RC Frame CurvatureShear ForceAxial ForceAxial Strain

23. Silvia Mazzoni, NEESam 2008 BuildingTclViewer: Dynamic-Analysis Diagrams Steel Frame CurvatureShear ForceAxial ForceAxial Strain

24. Silvia Mazzoni, NEESam 2008 OpenSees Days 2008 September 8-9, 2008 @ UCB-Richmond Field Station 2 Days: –Annual User Workshop Revised to be more hands-on & Interactive WebCast, possibly –Modeling Workshop Building Modeling Bridge Modeling Geotechnical Modeling Monday, September 8, 2008 Tuesday, September 9, 2008