design flaws

Engineering Design FlawsEngineering Design Flaws

Hyatt Regency DisasterHyatt Regency DisasterJuly 17, 1981July 17, 1981

What happens when poor What happens when poor choices are made and specifics choices are made and specifics in engineering are overlooked?in engineering are overlooked?

Trade Off DecisionsTrade Off Decisions

Cutting back on money to finance one Cutting back on money to finance one area to finish a project or add to another area to finish a project or add to another area of the project. area of the project.

Skywalk collapsed; killed 114; injured 200 moreSkywalk collapsed; killed 114; injured 200 more

Hyatt RegencyHyatt Regency

40-story hotel40-story hotel

Deadliest structural collapse in U.S. Deadliest structural collapse in U.S. historyhistory

Original designOriginal design

New designNew design

More mistakes…More mistakes…C-beams welded together as supportsC-beams welded together as supportsRods went through the welds.Rods went through the welds.

Hyatt VideoHyatt Video

http://www.youtube.com/watch?v=czmQS81k9eMhttp://www.youtube.com/watch?v=czmQS81k9eM

Bridge DisastersBridge Disasters

Minneapolis I35 BridgeMinneapolis I35 Bridge13 victims13 victims60 injured60 injuredhttp://http://

www.youtube.com/watch?v=O6ommRCUcsgwww.youtube.com/watch?v=O6ommRCUcsghttp://www.youtube.com/watch?v=ObzQjrjUjl8http://www.youtube.com/watch?v=ObzQjrjUjl8

Tacoma BridgeTacoma Bridge

19401940http://www.civeng.carleton.ca/Exhibits/Tacoma_Narrows/http://www.civeng.carleton.ca/Exhibits/Tacoma_Narrows/

http://www.youtube.com/watch?v=j-zczJXSxnwhttp://www.youtube.com/watch?v=j-zczJXSxnw

Design FlawsDesign Flaws

Oversight – moving Oversight – moving ahead with a project ahead with a project even though there might even though there might be dangers. be dangers.

Oversights….. Oversights…..

Can you think of any events in history that Can you think of any events in history that would fall into this category? would fall into this category?

Why was this an oversight?April 15, 1912

TitanicTitanic Liner heading to New York from South Hampton, UK. Liner heading to New York from South Hampton, UK. Hit the iceberg on 11:40 pm on April 14, 1912. Sank 2 Hit the iceberg on 11:40 pm on April 14, 1912. Sank 2

hours, 14 minutes later. hours, 14 minutes later. More than 1500 deaths, 710 survivors. More than 1500 deaths, 710 survivors. Enough lifeboats for only 1,178 people. Enough lifeboats for only 1,178 people.

http://www.youtube.com/watch?v=FSGeskFzE0shttp://www.youtube.com/watch?v=FSGeskFzE0s http://dsc.discovery.com/tv-shows/discovery-presents/videos/deep-inside-the-titanic-the-icebergs-gash.htmhttp://dsc.discovery.com/tv-shows/discovery-presents/videos/deep-inside-the-titanic-the-icebergs-gash.htm http://www.youtube.com/watch?v=vjKGYJac0GUhttp://www.youtube.com/watch?v=vjKGYJac0GU

Ford Pinto

1971-1980 Ford Pinto1971-1980 Ford Pinto

Over 3 million sold in the 10 year period. Over 3 million sold in the 10 year period. Recall of the car in 1978Recall of the car in 1978Gas tank was placed in the rear of the car, Gas tank was placed in the rear of the car,

causing it to explode upon rear impact causing it to explode upon rear impact accidents. accidents.

http://www.youtube.com/watch?v=rcNeorjXMrEhttp://www.youtube.com/watch?v=rcNeorjXMrE

Space Shuttle ChallengerSpace Shuttle Challenger

Space Shuttle ChallengerSpace Shuttle Challenger

January 28, 1986. January 28, 1986. Broke apart 73 seconds into its flight, Broke apart 73 seconds into its flight,

leading to the deaths of its 7 crew leading to the deaths of its 7 crew members. members.

Disintegrated over the Atlantic Ocean at Disintegrated over the Atlantic Ocean at 11:38 am EST. 11:38 am EST.

Space Shuttle ChallengerSpace Shuttle Challenger

Disintegration of the entire vehicle began Disintegration of the entire vehicle began after an O ring failure caused a breach in after an O ring failure caused a breach in the SRB joint it sealed, allowing the SRB joint it sealed, allowing pressurized hot gas from within the solid pressurized hot gas from within the solid rocket motor to reach the outside and rocket motor to reach the outside and impinge upon the adjacent SRB impinge upon the adjacent SRB attachment hardware and external fuel attachment hardware and external fuel tank. This led to the structural failure that tank. This led to the structural failure that was broken apart by aerodynamic forces. was broken apart by aerodynamic forces.

The CrewThe Crew It is believed that It is believed that

several crew survived several crew survived the initial breakup of the initial breakup of the spacecraft, the spacecraft, however, due to the however, due to the fact that there was no fact that there was no escape system, the escape system, the impact of the crew impact of the crew compartment with the compartment with the ocean would have ocean would have been too violent to be been too violent to be survivable. survivable.

The Challenger ExplosionThe Challenger Explosion

http://www.youtube.com/watch?v=j4JOjcDFtBEhttp://www.youtube.com/watch?v=j4JOjcDFtBEhttp://www.history.com/topics/challenger-http://www.history.com/topics/challenger-

disasterdisaster

Space Shuttle ColumbiaSpace Shuttle Columbia

Space Shuttle ColumbiaSpace Shuttle Columbia

February 1, 2003February 1, 2003Shortly before it was scheduled to Shortly before it was scheduled to

conclude its 28conclude its 28 thth mission, it disintegrated mission, it disintegrated over Texas and Louisiana during re-entry over Texas and Louisiana during re-entry into the Earth’s atmosphere. into the Earth’s atmosphere.

Space Shuttle ColumbiaSpace Shuttle ColumbiaDamage sustained during launch when a Damage sustained during launch when a

piece of foam insulation the size of a small piece of foam insulation the size of a small briefcase broke off from the external tank briefcase broke off from the external tank under the aerodynamic forces of launch. under the aerodynamic forces of launch. The debris struck the leading edge of the The debris struck the leading edge of the left wing, damaging the thermal protection left wing, damaging the thermal protection system which shields the vehicle from the system which shields the vehicle from the intense heat generated during re-entry. intense heat generated during re-entry.

NASA knew there was an issue while in NASA knew there was an issue while in space. space.

The crewThe crew

All 7 crew members were killed.

The Columbia ExplosionThe Columbia Explosion

http://www.youtube.com/watch?v=wF-http://www.youtube.com/watch?v=wF-qSOtTKssqSOtTKss

http://dsc.discovery.com/tv-shows/other-http://dsc.discovery.com/tv-shows/other-shows/videos/assignment-discovery-shows/videos/assignment-discovery-shorts-space-shuttle-columbia-shorts-space-shuttle-columbia-disaster.htmdisaster.htm

New York BlackoutNew York BlackoutJuly 14, 1977July 14, 1977Over 3500 arrests, 50 stolen cars, Over 3500 arrests, 50 stolen cars,

1000 fires1000 fireshttp://www.youtube.com/watch?http://www.youtube.com/watch?

v=B_nEGZpXeZgv=B_nEGZpXeZg

Engineering Design FlawsEngineering Design Flaws

Hyatt Regency Hotel Hyatt Regency Hotel Space Shuttle Challenger Space Shuttle Challenger TitanicTitanicPinto Pinto I35 BridgeI35 BridgeTacoma BridgeTacoma BridgeSpace Shuttle ColumbiaSpace Shuttle Columbia