ODEn OpenSees Design Environment

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ODEn OpenSees Design Environment

• Adam Markowitz, Alisa Neeman,
• Boris Jeremic, Alex Pang
• University of California, Santa Cruz and
  University of California, Davis

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Motivation

• OpenSees earthquake engineering simulation
  requires hand-coding C or Tcl
• User creates a mesh in Abaqus or GiD
• Creation of materials
• Creation of elements
• one by one or
• user may write single-use Matlab script to assist
• Process is cumbersome and error-prone
• No visual cues to aid user

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The Dream
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Pieces of ODEn

• Abconv
• Convert Abaqus data to OpenSees XML document
• ODEn (GUI)
• Visualize, modify, and persist OpenSees XML
  Documents
• Osgen
• Generate OpenSees source code (C, Tcl, etc.)
  from OpenSees XML documents

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Why use XML?

• Well formatted
• Automated validation
• Human readable
• Machine readable
• Platform Independent
• XML does half the work of a compiler
• Facilitates translation to other formats

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Main Capabilities

• Automate mesh-to-element transformation
• Provide visual interface so user can check design
  for errors
• Automate creation of materials
• Facilitate assignment of materials and/or
  material properties
• To single elements
• To groups of elements
• Persist models for future modifications

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Abconv

• Read mesh data from Abaqus
• Convert mesh data into an OpenSees XML document

Part, nameSoil Node 1, 30368., 0.,
13520. 2, 23504., 0., 13520.
./abconv mesh.inp
ltNodeGroup name"Soil"gt ltNode id"1"
Crd1"30368" Crd2"0" Crd3"13520" /gt ltNode
id"2" Crd1"23504" Crd2"0" Crd3"13520" /gt
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ODEn

• Domain inspector
• Allows selection and modification (materials,
  etc.) of finite elements and finite element
  groups
• Reads in OpenSees XML documents
• Generated by abconv
• Serialized from OpenSees Domain (printXMLModel)
• Persist OpenSees XML document with properties
  such as materials, etc.

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ODEn interface
Element group
Material properties
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ODEn interface
Saved Materials
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osgen

• osgen (OpenSees Generator) takes an OpenSees
  XML instance document, and validates against the
  OpenSees XML Schema. This XML instance document
  represents a serialized OpenSees Domain and is
  used to generate runnable source code
  automatically. Essentially, osgen acts like a
  compiler from XML to C or Tcl.

XMLschema
GenerateC
XML domain
validate
GenerateTcl
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Big Picture

• ODEn allows visualization, design, and
  modification of properties for OpenSees objects
  using an intuitive Graphical User Interface
• Input OpenSees XML document, Abaqus mesh data,
  etc.
• Output OpenSees XML document, C or Tcl source
  code

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Future Work

• Version Control Integration to version Domain XML
  Documents
• Code generation plugins (such as Tcl)
• Architecture already in place!
• Multi-platform GUI support

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Thanks!
Working prototype can be found at NEESforge as
part of the VEES project Were looking for
volunteers to code and participate in user
studies http//neesforge.nees.org/projects/vees/