Text of BRIDGE EXPLORATIONS ïƒ What makes bridges stay up ïƒ What makes bridges fall...
BRIDGE EXPLORATIONS What makes bridges stay up What makes bridges fall down Different types of bridges You will design and construct a bridge You will test your bridges load capacity
The Tarr Steps England Circa 1000 B.C.
KOCHER VIADUCT, AUTOBAHN, GERMANY 185 m HIGH, 1128 m LONG
Top of beam is in compression and bottom is in tension. The middle of the beam is neutral the middle is in neither compression or tension.
Making a beam stiffer: I Beams move most of the beams material away from the neutral axis which is underutilized. This results in a stiffer beam.
Arch Bridges PONT DU GARD, FRANCE, 63 BC-13 BC 47.4 m HIGH
Arches are made of wedge-shaped stones in compression. Without the keystone the two sides of the arch will fail. The wedged stones at the bottom must be prevented from moving outwards using abutments (stones anchored into the soil).
MOSTAR BRIDGE, YUGOSLAVIA 1566-1567 27.3 m SPAN, 19 m HIGH
Cabin John Bridge, Washington D.C.
RHINE RIVER, BONN- BUEL, 1948
FRANCIS SCOTT KEY BRIDGE, WASHINGTON, DC
HEILBRONN, AUT0BAHN, GERMANY
Truss Bridges A truss is a hinged triangle
TENMON BRIDGE, KUMAMOTO PREFECTURE, JAPAN SPAN 100 + 300 +100 m 42 m CLEARANCE, 1966
Why are trusses so common? The members are in either experiencing compression or tension; the members are not bending. Trusses can be arranged into many shapes.
Truss Bridge with a moveable center section.
Cabin John Bridge, under construction using timber false work
Cantilever Truss Bridge
Cantilever is a beam supported at only one end. Cantilever Bridges
The Forth Rail Bridge c.1882-1889 Scotland One the worlds most massive bridges.