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PEER/NEES Concrete Column Blind Prediction Contest

Quake Summit 2010, NEES & PEER Annual Meeting, October 8-9. October 9, 2010. PEER/NEES Concrete Column Blind Prediction Contest. MODELING APPROACH. 3D beam-column elements Moment-axial interaction Lumped plasticity at nodes ASCE 41 backbone curve ANSR-II for non-linear analysis.

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PEER/NEES Concrete Column Blind Prediction Contest

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  1. Quake Summit 2010, NEES & PEER Annual Meeting, October 8-9 October 9, 2010 PEER/NEES Concrete Column Blind Prediction Contest

  2. MODELING APPROACH • 3D beam-column elements • Moment-axial interaction • Lumped plasticity at nodes • ASCE 41 backbone curve • ANSR-II for non-linear analysis

  3. MODELING APPROACH • Moment-curvature to verify: • Section response • Strain hardening • Failure mechanism • Effective section properties: • SLS: 0.78Ig • ULS: 0.38Ig Per NZS 3101: 2006

  4. MODELING APPROACH Damping: Based on original stiffness SLS: 2.0% ULS: 2.5% Moderate unloading stiffness degradation: a = 0.3

  5. PERFORMANCE PREDICTIONS • Parameters that generally correlated well: • Displacement • Acceleration • Base moment • Shear force … with some exceptions! • Displacements for record 5 were significantly different • Accelerations for records 3 & 6 were lower than predicted

  6. PERFORMANCE PREDICTIONS • Parameters that did not correlate well: • Axial force • Curvature • Axial strain • Records 5 & 6 had the largest result scatter

  7. CONCLUSIONS & NEXT STEPS … Design office procedures in conjunction with ASCE 41 are capable of estimating global demand parameters with reasonable accuracy, on average. Macro modeling techniques are not well suited to capturing local member response: Curvature Strain etc. Tangent stiffness damping may be more appropriate for this type of structure With access to shake table test data, further improvement to these macro-modeling techniques can be expected

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