what goes up, must come down: lessons from the cather ......music: “spinning wheel” by blood,...

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