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Numerical Model Classification Sheet 15WCEE Blind Test Challenge, September 2012

Team Name: Fatigue Group_____________________________________ Team Number: 092

Institution: Escuela Superior Politécnica del Litoral, University of British Columbia, Universidad

Técnica Particular de Loja Country: Ecuador Nº of elements:5

General description of the numerical model:

We develop a 3D model with Fiber Sections on Opensees framework, defining all material curves

and sections according with information proportionated by the challenge organization.

And using for elements: nonlinear beam-column elements, and elastic beam-column elements.

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PART I – Modelling Techniques

1. Formulation:

Framework method (finite element method, etc.): _Finite Element Method____________________

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Global formulation (structure level): ☒Equilibrium-based; ☐Compatibility-based; ☐Mixed; ☐Other.

Observations: ____________________________________________________________________

Local formulation (element level): ☒Equilibrium-based; ☐Compatibility-based; ☐Mixed; ☐Other.

Observations: ____________________________________________________________________

Model classification: ☐Phenomenological/Global response; ☒Fibre; ☐Local modelling; ☐Other.

Observations: ____________________________________________________________________

Geometrical formulation: ☐Linear; ☒Non-linear; ☐Other.

If Non-linear, specify type (e.g. P- effects): __ P- effects ________________________________

Observations: ____________________________________________________________________

Rigid-body movements are simulated: ☐Yes; ☒No.

If Yes, specify formulation: __________________________________________________________

2. Discretization:

Type: ☒Beam/shell elements; ☐Local discretization (e.g. concrete hexahedrons); ☐Both; ☐Other.

Observations: ____________________________________________________________________

3. Constitutive models:

Type: ☐RC global response; ☒Separate models for the materials; ☐Other.

Observations: ____________________________________________________________________

3.1 If you selected “RC global response”:

RC model description: _____________________________________________________________

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3.2 If you selected “Separate models for the materials”:

Concrete model description: _Mander Model for confined concrete with plastic hinges___________

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Reinforcing steel model description: __Giuffre-Mennegoto-Pinto model + Low Cycle Fatigue_____

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Other constitutive models (e.g. concrete-steel bond): _____________________________________

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Please select the mechanical effects included in the simulation (add effects if you want):

Concrete Reinforcing Steel Concrete-steel bond

☒ Compressive strength ☒ Yield and monotonic hardening ☐ Monotonic bond strength

☐ Tensile strength ☒ Cyclic and reverse loading response ☐ Cyclic and reverse loading response

☒ Biaxial stress states (confinement) ☒ Bauschinger effect ☐ Cyclic strength degradation

☐ Triaxial stress states ☐ Cyclic hardening ☐ Radial stress (confinement)

☒ Softening after peak stresses ☒ Low-cycle fatigue ☐ Loading-rate

☐ Localization phenomenon ☐ Buckling ☐ Bond heterogeneity

☒ Permanent deformations ☐ Loading-rate ☐ _____________________________

☐ Loading-rate ☐ Steel heterogeneity ☐ _____________________________

☐ Concrete heterogeneity ☐ _____________________________ ☐ _____________________________

☐ ____________________________ ☐ _____________________________ ☐ _____________________________

☐ ____________________________ ☐ _____________________________ ☐ _____________________________

☐ ____________________________ ☐ _____________________________ ☐ _____________________________

PART II – Implementation, Global Algorithms and Computational Characteristics

1. Implementation:

Software name: ____OPENSEES_____________________________________________________

Type: ☐Commercial; ☐Non-profit/Closed-Source; ☒ Non-profit/Open-Source; ☐Other.

Observations: ____________________________________________________________________

Operating system: ☒Windows; ☐Linux; ☐ Mac OS; ☐Other.

Observations: ____________________________________________________________________

Hardware architecture:

Type of implementation: ☐Distributed; ☒Local; ☐Other.

Observations: ____________________________________________________________________

Hardware characteristics:

Processing units (number and type): ___1 PC Intel Core I7 RAM 4 Gb _______________________

RAM Memory (amount and type): _4 GB______________________________________________

Computational architecture: ☒Sequential; ☐Concurrent (Parallel/Distributed); ☐ Other.

Observations: ____________________________________________________________________

2. Solution procedure:

Default method: ☒Newton-method; ☐Other.

If Newton-method, please describe the variant: __________________________________________

Other solving techniques (e.g. line-search, arc-length): ____________________________________

3. Time-integration method:

Method (e.g. -Method): ________________; Parameters: _______________________________

Observations: ____________________________________________________________________

Numerical damping: ☐Yes; ☐No;

If Yes, specify the formulation and damping level: ______________________________________

Observations: ____________________________________________________________________

4. Damping:

Type: ☒Proportional; ☐Other

If Proportional, specify damping level (e.g. 5% at x Hz and y Hz): __2% AT 10Hz , 2% at 2Hz___

Observations: ____________________________________________________________________

5. Problem-size:

Typical number of degrees-of-freedom or equivalent: _____330_______________________________

Typical computing time by scenario (approximately, in seconds):____200_______________________

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Notes: If your model does not fit the given options, please choose “Other” and specify your case in the

“Observations” line. If a specific item is not applicable to your case, please write “Not applicable” or “N/A”.