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First National Educational Competition on Predicting Progressive Collapse Resistance of Reinforced Concrete Structural S

First National Educational Competition on Predicting Progressive Collapse Resistance of Reinforced Concrete Structural Systems. Presentation by: Jesse Conklin Group Members: J.P. Telemaque & Mike Milano. Level 1 – Undergraduate University of Massachusetts Amherst.

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First National Educational Competition on Predicting Progressive Collapse Resistance of Reinforced Concrete Structural S

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  1. First National Educational Competition onPredicting Progressive Collapse Resistance of Reinforced Concrete Structural Systems Presentation by: Jesse Conklin Group Members: J.P. Telemaque & Mike Milano Level 1 – Undergraduate University of Massachusetts Amherst

  2. Competition OutlineLevel 1 – Undergraduate • 1/8” scale 2-D model of a RC frame with 3 stories and 4 bays • 2 Step procedure: • Instantaneously removing the glass column at first floor in the center of the frame • If the frame remained standing, the structure was tested with static loads only and tested until failure • Predicted displacements and total static loading after instantaneous removal of center column

  3. 1/8th Model Frame

  4. Full Size 2-D Exterior Frame

  5. 1/8th Scale Model of 2-D Exterior Frame

  6. SAP2000 1/8th Scale Analytical Model

  7. 1/8th Scale Cross-sections

  8. Maximum Deflection of Frame • Used SAP2000 Analysis for Deflection • Actual Results: • Maximum - .21” • Residual - .20” • Calculated Results: • Maximum - .15” • Residual - .08”

  9. Material Properties • Dimensions of scaled model are 1/8 of full scale model • Applied loads are 1/64 of full scale applied loading to maintain approximate equal amounts of stress as compared to full scale model • f’c = 7,000 psi • fy = 55 ksi, fu = 75 ksi

  10. XTract • Each cross section was modeled in XTract to determine moment-curvature behavior • Ultimate moment values from XTract were compared to moment values from SAP2000 full size analytical model • Confined concrete - Mander model

  11. SAP2000 Full Size Analytical Model

  12. Static Loading • 1st Hinge – Reached Moment Capacity • Section B-B @ face of middle column – both sides • Load = 1015 lbs • Added pin at plastic hinge location – moment redistributed, checked deflection and curvature capacity • 2nd Hinge – Reached Moment Capacity • Section B-B @ 6 ft. from face of column B – both sides • FAILURE • Load = 1454 lbs • Predicted Collapse Load = 1454 lbs • Actual Collapse Load = 1800 lbs

  13. Collapse

  14. Predicting Collapse Improvements • Deflection • Correct dimensions of 1/8th scale frame • Calculation of Ic • Collapse Load • XTract – 1/8th scale cross-section moment-curvature analysis

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