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Transcript of BRIDGE PROJECT
Images from Shutterstock.com
Roman bridges were the first known bridges to have been constructed at Rome over the Tiber
TYPES OF BRIDGES
By: Morgan McLinden, Kailey McCoy, Bridget Krumholz, Elsa Fering, Savannah Kiffmeyer, Ali Ryan-Mosley
Push or pull in any direction
Weight, wind, air resistance, or moving vehicles are all forces that have an effect on bridges
Newton’s third law of motion:
Each action has an equal and opposite reaction
****Must take all into consideration while making bridges
how hard atoms/molecules are pushed/pulled as a result of external forces
from stress, we learn that we need to use hardwood because hardwood handles more stress
Beam bridge because it's identified by a series of triangles
forces are carried along the triangle
relies on axially loaded members acting
Rely on compression because forces carry out the curve of an arch
have large pylons
tall towers rising above the water
cables that hold up road deck
reaction to wind= bad
Intension or compression in tension or strain
*George Washington Bridges
2 dominating materials used in bridge construction:
Menai Bridge= first major suspension bridge built in 1826, with iron eye bar chains as main cable
came into play in the mid 19th century
St. Louis Bridge (1874)
Brooklyn Bridge (1883)
Firth of Forth Bridge (1889)
Evolution of Bridges
Humans started building bridges many thousands of year ago; 4 mains types:
*All 4 existed for a very long time, but not as
Used natural construction materials:
Our bridges today are bigger,
stronger,and more sophisticated.
What effects the evolution of bridge technology?
2 Main Eras in Bridge Evolution:
Arch Era (2000 BC- 1850 AD)
Contemporary Era (1850 AD- now)
iron and steel
The Morinators Task:
A bridge needs be built in Hastings, Minnesota
Current bridge is unstable, has worsened over the years with corrosion, broken bearings, rotting sidewalks, and crumbling concrete
Solution: Our proposed bridge is to replace the Hastings bridge which spans the Mississippi River in Hastings on Hwy 61
During the construction, the bridge will still be accessible for vehicles
Two lanes of traffic will be switched to a new bridge in 2013
All 4 lanes will be open by end of 2013
Construction completed by 2014
Total cost= $120 million
This budget takes into consideration the cost of construction materials, labor costs, archeological and historical investigations, location surveys, environmental studies surveys, and soil testing.
Under this venture Morinators Design and Construction (MDC) can earn a bonus of up to $300,000 by getting the four lanes open before the 2013 deadline.
The bridge will be financed through a combination of $2 million from the federal government, State tax levies, and the 2008 Transportation Funding Package.
This bridge should last for up to 100 years with our maintenance plan
Our firm will independently inspect the bridge every 5 years and mend anything needing repairs of the bridge
The insurance covers damage and destruction to the bridge in the event of fire, flood and explosion
Bridge will be maintained and inspected by the local municipalities, MN state department of transportaion, and the federal department of transportation.
These organizations will share responsibility of any damage the bridge may undergo including corrosion, erosion and unnatural problems.
12-foot wide pedestrian path under the bridge
A plaza south of 2nd Street
Parking beneath the bridge
An anti-icing system