Lecture+02 - Board Meeting HWY07MH024 440:221 Intro to...

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Unformatted text preview: Board Meeting HWY07MH024 440:221 Intro to Engineering Mechanics: Statics 1 Lecture 2 Engineering Case Study Spring 2011 Slides from http://www.ntsb.gov/events/2008/Minneapolis-MN/presentations.htm Alberto Cuitino, Kimberly Cook-Chennault, Kathryn Higgins Instructors Gulsad Kucuk, Stephen Indyk, Tushar Saraf Assistants Office of Research and Engineering Bridge Description and Collapse Jim Wildey Board Meeting HWY07MH024 Presentations 1. Bridge description and collapse 2. Construction activities on bridge at time of collapse 3. Gusset plate inadequacy 4. Finite element modeling analysis 5. Design and review process 6. Bridge load rating and bridge load analysis 7. Bridge inspections 8. Gusset plate inspections Board Meeting HWY07MH024 Bridge Description and Collapse 1. General description of bridge Structural elements Bridge modifications 2. Sequence of collapse Initiation location Secondary damage and fractures 3. Factors excluded Board Meeting HWY07MH024 Bridge Description and Collapse 4QBOT 4QBOT 4QBOT U10 West North Deck truss South approach North approach Board Meeting HWY07MH024 General Description of the Bridge Bridge Description and Collapse a Board Meeting HWY07MH024 Deck truss original weight: 18.3 million pounds 1977 Modification Deck thickness increased Added over 3 million pounds 1998 Modification Barriers / deicing system Added 1.2 million pounds General Description of Bridge Board Meeting HWY07MH024 Sequence of Collapse Deck truss Camera Video Evidence Pre-Collapse North South Board Meeting HWY07MH024 Video Evidence Video Evidence Video Evidence Pre-Collapse North South Video Evidence Collapse Video - Frame #1 North South L11W Video Evidence Collapse Video - Frame #2 L11W North South Video Evidence Collapse Video - Frame #3 North South L11W Video Evidence Collapse Video - Frame #4 North L11W South Video Evidence Collapse Video - Frame #5 North South Video Evidence Collapse Video - Frame #6 North South Video Evidence Collapse Video - Frame #7 North South Video Evidence Collapse Video - Frame #8 North South Video Evidence Collapse Video - Frame #9 North South Video Evidence Collapse Video - Frame #10 North South Video Evidence Collapse Video - Frame #11 North South Video Evidence Pre-collapse North South Board Meeting HWY07MH024 Video Evidence No initiation in center section or north section Collapse initiated south of node L11 Node L11W remained intact after collapse initiated Deck lifted from stringers above node L11 and further to the south Board Meeting HWY07MH024 Basis of Collapse Sequence Video evidence Fracture and damage patterns Finite element analysis Board Meeting HWY07MH024 Fracture and Deformation North Lower chords Upper chord Upper chord U10E U10W Board Meeting HWY07MH024 Sequence of Collapse Methodology Initiating event occurs from forces acting along the members Buckling under compression Board Meeting HWY07MH024...
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Lecture+02 - Board Meeting HWY07MH024 440:221 Intro to...

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