What Goes Up, Must Come Down:Lessons from the Cather/Pound Demo
Richard L. Wood, Christine E. Wittich, Daniel G. LinzellDepartment of Civil Engineering
Larry ShippenUniversity Housing
Music: “Spinning Wheel” by Blood, Sweat & Tears
What Goes Up, Must Come Down:Lessons from the Cather/Pound Demo
Richard L. Wood, Christine E. Wittich, Daniel G. LinzellDepartment of Civil Engineering
Larry ShippenUniversity Housing
MOTIVATION: BUILDING COLLAPSE
TORNADO
EARTHQUAKE
VEHICULAR IMPACT
EXPLOSION & FIRE
Video Credits:TOMO News “Building Collapse Video: SUV High Speed Chase”
New York City Fire Department “HD Video of Fire and Major Building Collapse”
Video Credits:The Weather Channel “EF5 Tornado Rips Apart House”
abreuESrayado “Mexico City Earthquake (9/19/2017), building collapses”
HOW CAN WE LEARN MORE?
How does an explosion or blast impact a building?
How does a group of buildings or community respond during an extreme event?
What mechanisms contribute to a building’s collapse?
HOW CAN WE LEARN MORE?
How does an explosion or blast impact a building?
How can we retrofit or redesign buildings to enhance public health and safety in the face
of extreme events?
How does a group of buildings or community respond during an extreme event?
What mechanisms contribute to a building’s collapse?
CATHER‐POUND DEMOLITION
TIMELINE1963 Cather & Pound Halls Open2010 Feasibility Study for Renovation
Spring 2014 Cather Hall ClosesSpring 2017 Pound Hall ClosesOct. 2017 Demolition BeginsDec. 2017 Implosion Preparations
Dec. 22, 2017 Implosion Complete
First Discussions for Collaboration between UNL Housing & Civil Engineering
Civil Engineering Monitoring Begins
INSTRUMENTATION
ACCELEROMETERS LASER SCANNERS UNMANNED AERIAL VEHICLES
RESULTS: PRE‐IMPLOSION PROPERTIES
BEFORE DEMOLITION AFTER PARTIAL DEMOLITION
RESULTS: COLLAPSE MONITORING
RESULTS: COLLAPSE MONITORING
RESULTS: ADJACENT BUILDINGS
ABEL HALL
CATHER DINING COMPLEX
NEIHARDT RESIDENTIAL COMPLEX
CATHER‐POUND DEMO SITE
PEAK ACCELERATION: 0.08 gPEAK VELOCITY: 2.8 cm/s
PEAK ACCELERATION: 0.02 gPEAK VELOCITY: 0.8 cm/s
PEAK ACCELERATION: 0.002 gPEAK VELOCITY: 0.12 cm/s
RESULTS: ADJACENT BUILDINGS
Numerical Simulation of Building Implosion
PREPARING FOR THE FUTURE
Predictive Simulations: Localized Column Removal
PREPARING FOR THE FUTURE
ACKNOWLEDGMENTS
COLLABORATORS AND CONTRIBUTORS:• Matt WaiteCollege of Journalism and Mass Communications
• Craig ChandlerOffice of University Communications
• Ryan MeintsOlsson Associates, Lincoln, NE
• Mark DahmkeCommercial Photographer, Lincoln, NE
• Yashar Eftekhar AzamDepartment of Civil Engineering
• ARK WreckingTulsa, OK
• Controlled Demolition, Inc.Phoenix, MD • Kanchan Devkota
• Garrett Martindale• Chen Fang
• Yijun Liao• Ebrahim Mohammadi• Ahmed Rageh
PARTICIPATING CIVIL ENGINEERING GRADUATE STUDENTS:
Music: “Dust In the Wind” by Kansas