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NEES Annual Meeting – June 2008. OpenSees Capabilities & Integration with NEES. Silvia Mazzoni, Frank McKenna, Gregory L. Fenves University of California, Berkeley. Introduction. OpenSees & NEES goals: Large-Scale Structural and Geotechnical Simulations Community support and development

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opensees capabilities integration with nees

NEES Annual Meeting – June 2008

OpenSees Capabilities&Integration with NEES

Silvia Mazzoni, Frank McKenna, Gregory L. Fenves

University of California, Berkeley


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
numerical simulation update
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
structural modeling
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
large scale building frame nonlinear time history analyses
Large-Scale Building-FrameNonlinear 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

numerical simulation of bridge model


2-Span Bridge

Fundamental Period in the Transverse Direction



Period (sec)






Numerical Simulation of Bridge Model

NEESR-SG Seismic Performance of Bridge Systems with Conventional and Innovative Materials

PI: Professor Saiid Saiidi, University of Nevada, Renoco-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)

  • 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

2 span bridge model comparison
2-Span Bridge-Model Comparison

Global Response: Drift Ratio

Local Response: Curvature

Matthew Dryden

UC Berkeley

type of geotechnical problems that can be solved using opensees
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

ucd computational geomechanics research
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

example application
Example Application:

3D Liquefaction

Simulation of Bridge Pier–Pile in

Sloping Liquefied Soils

Boris Jeremic

UC Davis, 2008

peer testbed nonlinear soil foundation structure interaction transverse and longitudinal response

Humboldt Bay Middle Channel Bridge

PEER Testbed: Nonlinear Soil-Foundation-Structure InteractionTransverse and Longitudinal Response

UCSD: A. Elgamal, J. Conte, Z. Yang, L. Yan

Kent-Scott-Park model


Ahmed Elgamal

UC San Diego, 2008

opensees petascale computing and visualization
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

openseespl 3d soil island and pile pile group user interface
OpenSeesPL: 3D Soil Island and Pile/Pile-group user-Interface

  • A 3D seismic analysis tool for single pile in a half-space

Pile definition

Soil strata





Input motion


Soil strata

Mesh viewer

Model builder

Ahmed Elgamal

UC San Diego, 2008

high performance computing
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
example usage openseesmp steel building parameter study
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

opensees neesit integration
OpenSees & NEESit Integration


Teragrid & Co.






T. Haupt, A. Kalyanasundaram, I. Zhuk

Mississippi State University

T. Haupt

Mississippi State University

opensees simportal
OpenSees SimPortal
  • Model:
  • Edit
  • Check
  • Visualize
  • Submit
  • Monitor
  • Results

T. Haupt

Mississippi State University


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
buildingtclviewer results diagrams rc frame
BuildingTclViewer: Results DiagramsRC Frame


Shear Force

Axial Force

Axial Strain

buildingtclviewer dynamic analysis diagrams steel frame
BuildingTclViewer: Dynamic-Analysis DiagramsSteel Frame


Shear Force

Axial Force

Axial Strain

opensees days 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