A truss bridge is a bridge composed of connected elements (typically straight) which may be stressed from tension, compression, or sometimes both in response to dynamic loads. Truss bridges are one of the oldest types of modern bridges. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by nineteenth and early twentieth century engineers. A truss bridge is economical to construct owing to its efficient use of materials.Tuesday, August 31, 2010
Research and Investigation:Pratt Truss
Pratt Truss
A truss bridge is a bridge composed of connected elements (typically straight) which may be stressed from tension, compression, or sometimes both in response to dynamic loads. Truss bridges are one of the oldest types of modern bridges. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by nineteenth and early twentieth century engineers. A truss bridge is economical to construct owing to its efficient use of materials.
A truss bridge is a bridge composed of connected elements (typically straight) which may be stressed from tension, compression, or sometimes both in response to dynamic loads. Truss bridges are one of the oldest types of modern bridges. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by nineteenth and early twentieth century engineers. A truss bridge is economical to construct owing to its efficient use of materials.
Research and Investigation.
K Truss.
In the K Truss, the length of the members that undergo compression is reduced. The design of this bridge is complicated and is considered to be one of the hardest bridges to build.
In the K Truss, the length of the members that undergo compression is reduced. The design of this bridge is complicated and is considered to be one of the hardest bridges to build.
Research and Investigation
Warren Bridge
The Warren bridge consists of longitudinal members joined only by cross angled members.
The load on this bridge causes compression and tension in the center of the bridge.
The Warren bridge consists of longitudinal members joined only by cross angled members.
The load on this bridge causes compression and tension in the center of the bridge.
Research and Investigation:truss type
Howe Truss
From 1840 to about 1870 the standard railroad bridge was the Howe truss, a rectangular trussed frame of wooden diagonals and vertical iron tie rods. This bridge was invented by William Howe, a farmer turned inventor.
Thursday, August 26, 2010
Research and Investigation
Shear
Ahear is a force that causes parts of a waterial to slide past one another in opposite directions.
Ahear is a force that causes parts of a waterial to slide past one another in opposite directions.
Research and Investigation
Compression
Compression is a force that squeezes material together. When a material
is in compression, it tends to become shorter.
Compression is a force that squeezes material together. When a material
is in compression, it tends to become shorter.
Research and investigation
Tension
Tension is a forse that strechers a material apart. When a material is in tension, it tends to become longer.
Tension is a forse that strechers a material apart. When a material is in tension, it tends to become longer.
Tuesday, August 24, 2010
Research and Investigation
The truss bridge...
consists of an assembly of triangles. Truss bridges are commonly made from a series of straight, steel bars. The Firth of Forth Bridge in Scotland is a cantilever bridge, a complex version of the truss bridge. Rigid arms extend from both sides of two piers. Diagonal steel tubes, projecting from the top and bottom of each pier, hold the arms in place. The arms that project toward the middle are only supported on one side, like really strong diving boards. These "diving boards," called cantilever arms, support a third, central span.
consists of an assembly of triangles. Truss bridges are commonly made from a series of straight, steel bars. The Firth of Forth Bridge in Scotland is a cantilever bridge, a complex version of the truss bridge. Rigid arms extend from both sides of two piers. Diagonal steel tubes, projecting from the top and bottom of each pier, hold the arms in place. The arms that project toward the middle are only supported on one side, like really strong diving boards. These "diving boards," called cantilever arms, support a third, central span.
Research and Investigation
The beam bridge...
consists of a horizontal beam supported at each end by piers. The weight of the beam pushes straight down on the piers. The farther apart its piers, the weaker the beam becomes. This is why beam bridges rarely span more than 250 feet.
Thursday, August 19, 2010
Research and Investigation
Arch bridge
It has great natural strength. Thousands of years ago, Romans built arches out of stone. Today, most arch bridges are made of steel or concrete, and they can span up to 800 feet.
It has great natural strength. Thousands of years ago, Romans built arches out of stone. Today, most arch bridges are made of steel or concrete, and they can span up to 800 feet.
Wednesday, August 18, 2010
Design Situation
Desing a trussed bridge that can support a load of 4.0kg when it is placed on the bottom truss.
The best design will be the one with best specific (strength to weight ratio) at this load.
Engineers are not always interested in designing the strogest bridge. They are more interested in designing the best bridge to do the job.
A second challenge requires the bridge to be tested to destuction in order to determine its overall specific strength.
Restrictions
- The bridge is to be made from 3 mm x 3 mm paddle pop sticks.
-The total mass
The best design will be the one with best specific (strength to weight ratio) at this load.
Engineers are not always interested in designing the strogest bridge. They are more interested in designing the best bridge to do the job.
A second challenge requires the bridge to be tested to destuction in order to determine its overall specific strength.
Restrictions
- The bridge is to be made from 3 mm x 3 mm paddle pop sticks.
-The total mass
Subscribe to:
Posts (Atom)