1 Presentation by: Jesse Conklin Group Members: J.P. Telemaque & Mike Milano First National...
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Transcript of 1 Presentation by: Jesse Conklin Group Members: J.P. Telemaque & Mike Milano First National...
1
Presentation by:
Jesse Conklin
Group Members:
J.P. Telemaque & Mike Milano
First National Educational Competition onPredicting Progressive Collapse Resistance of
Reinforced Concrete Structural Systems
Level 1 – UndergraduateUniversity of Massachusetts Amherst
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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
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Maximum Deflection of Frame
Used SAP2000 Analysis for Deflection
Actual Results:
• Maximum - .21”
• Residual - .20”
Calculated Results:
• Maximum - .15”
• Residual - .08”
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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
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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
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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