Lsn5 - ME4123/6123 Lesson 5 Discuss A Failure Analysis...

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1 Discuss A Failure Analysis Method Steps Principles Questions Case Study: Hartford Civic Center Objectives 1. Discuss steps of a Failure Analysis procedure 2. Understand guiding principles of failure analysis 3. Review areas of interest about which to ask questions ME4123/6123 – Lesson 5
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2 Case Study: Hartford Civic Center The Structure Built in 1972-73 $70M structure Capacity: 12,500 seats plus affiliated shops Home of the New England Whalers The Roof Weight: 1400 tons Size: 2.5 acres (360’ x 300’ x 21’) Design: Steel Space Truss, flat profile, 4-point support Conditions January 1978 4.8 inches of heavy wet snow Collapse happened hours after a college basketball game
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3 Case Study: Hartford Civic Center Hartford Civic Center Plan View
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4 Case Study: Hartford Civic Center Hartford Civic Center Space Frame Detail
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5 Case Study: Hartford Civic Center
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6 Case Study: Hartford Civic Center What Happened? Computerized design Problems during construction Sags (2X design) Hole misalignment welds used rather than bolts on fascia pieces Weight of roof was 25% over spec Buckling of longest span under weight of snow … BUT … Weight of roof + snow < design maximum load “House of cards” effect Impact Loss of location for over 300 events annually Loss of focal point of urban renewal Loss of $20 million in revenue 1.5 to 2 years to rebuild
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7 Why study failure? Change something so it won’t happen again
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Lsn5 - ME4123/6123 Lesson 5 Discuss A Failure Analysis...

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