OpenSees.exe User Requirements

Implemented Requirements

• Element
  • Beam-Column Elements
  • Truss Elements
  • 2D Wall Elements

• Section
  • Elastic Section
  • Fiber Section
  • Section Aggregator
  • Elastic Membrane Plate Section
  • Plate Fiber Section
  • Bidirectional Section
  • Isolator2spring Section: Model to include buckling behavior of an elastomeric bearing

• uniaxialMaterial
  • Steel & Reinforcing-Steel Materials
    • Steel01 Material
    • Steel02 Material -- Giuffré-Menegotto-Pinto Model with Isotropic Strain Hardening
    • Hysteretic Material
  • Concrete Materials
    • Concrete01 Material -- Zero Tensile Strength
    • Concrete02 Material -- Linear Tension Softening
    • Concrete03 Material -- Nonlinear Tension Softening
  • Multi-Purpose Materials
    • Elastic Material
    • Elastic-Perfectly Plastic Material
    • Elastic-Perfectly Plastic Gap Material
    • Elastic-No Tension Material
    • Parallel Material
    • Series Material
    • Hardening Material
  • Contributed uniaxialMaterial
    • BARSLIP Material
    • Bond_SP01 - - Strain Penetration Model for Fully Anchored Steel Reinforcing Bars
    • Concrete04 Material -- Popovics Concrete Material
    • Concrete07 – Chang & Mander’s 1994 Concrete Model
    • Fatigue Material
    • Hyperbolic Gap Material
    • Limit State Material
    • PINCHING4 Material
    • PyTzQz uniaxialMaterials
    • Reinforcing Steel Material
    • SelfCentering Material – Flag-Shaped Hysteresis with Slip Deformation and Bearing
  • Elastic Isotropic Material
  • J2 Plasticity Material
  • Plane Stress Material
  • Plate Fiber Material
  • UCDavis Soil Models
    • Template Elasto-Plastic Material
  • UCSanDiego Soil Models
    • FluidSolidPorousMaterial
    • PressureDependMultiYield Material
    • PressureDependMultiYield02 Material
    • PressureIndependMultiYield Material
    • updateMaterialStage
    • updateParameter

• Recorder
  • Node
    • Node
    • EnvelopeNode
    • Drift
  • Element
    • Element
    • EnvelopeElement
  • Section
    • Element
    • EnvelopeElement
  • Fiber
    • Element
    • EnvelopeElement
  • Basic Visualization recorders
    • Display
    • Plot
    • playback Command

• Other

Under-Development Requirements

• Element
  • 2D/3D Wall Elements
  • 3d nonlinear frame element with full interaction (axial, flexure, torsion and subsequently shear)
• Section
• Material
  • Improved concrete materials
  • Improved reinforcing-steel materials
• Recorder
• Other

To-Be-Developed Requirements

• Element
  • Buckling-Brace Elements
  • Flexible Diaphragm
  • 2d Timoshenko beam element
  • 3d frame element with bond-slip of reinforcing steel
  • 3d frame element with slip between components, e.g. composite beam, composite column
  • 3d concentrated plasticity element with return map algorithm
  • 2d SIZE (spreading inelastic zone) beam element
  • Nonlinear geometry developments
    • Extension of corotational theory to membranes and shells
    • Reformulation of 3d frame nonlinear geometry such that any element can take advantage of nonlinear transformation (currently not the case); quaternions vs. rotation nodal variables require either a change in global solution strategy or the mapping back and forth between quaternions and node rotations.
  • The following elements include linear or corotational geometry for membranes and shells under large displacements
    • 3 to 6 node triangle
    • 4 to 9 node quad
    • 4 node quad with incompatible modes
    • 4 to 9 node RC panel (quad)
    • 4 to 9 node Mindlin layer plate/shell
    • 4 to 9 node Mindlin RC layer plate/shell
    • Discrete Kirchoff triangle plate/shell element

• Section
  • 2d normal and shear stress interaction

• Material
  • 3d J2 plasticity with kinematic and isotropic hardening
  • 3d plastic-damage concrete constitutive model Lee-Fenves

• Recorder

• Other

Continual-Development Requirements

• Documentation

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