What are Warren Truss bridges made of?
What are Warren Truss bridges made of?
They were originally built with cast and wrought iron members with pins and, later, with wrought iron members and cast iron joints with pins, and later fully riveted in steel. Polygonal top chords were also added in many trusses to extend the span length. J. A. L.
What makes a balsa wood bridge strong?
Restricting the physical size of the bridge. Restricting the size and shape of structural elements of the bridge (the individual pieces of balsa wood) Restricting the amount of glue that can be used during the construction. Limiting the types of glue that can be used for connecting pieces of balsa wood.
How much weight should a balsa wood bridge hold?
When at rest the device can support the static testing load of 20kg and meets the weight requirement at 84.4 grams.
How tall should a balsa wood bridge be?
Height: 2 to 6 in. Length: 12 inches, plus 1-3 inches on each side resting on tables.
Why is Warren Truss so strong?
This bridge type uses ridged triangles in the design, which makes it very strong. Warren truss bridges require lesser building material than most other bridge designs. It can be constructed piece by piece, which makes cost lesser than conventional ones which require the entire framework to be set up before building.
What is the strongest type of truss bridge?
In this experiment we have tested which type of truss bridge is the strongest, yet uses the least amount of material. Two of the most used truss bridges are of the Pratt and Howe design. Through our experiment it was found that the bridge design that minimized the maximum compression force was the Howe Bridge.
What is the strongest truss bridge design?
How does a Warren truss bridge work?
A single-span truss bridge is like a simply supported beam because it carries vertical loads by bending. Bending leads to compression, in the top chords (or horizontal members), tension in the bottom chords, and either tension or compression in the vertical and diagonal members, depending on their orientation.
What type of truss bridge holds the most weight?
The arch bridge
The arch bridge can hold the most weight of the three, the deck truss bridge can hold an average amount of weight, and the beam bridge could hold the least amount of weight.
What is the strongest wood bridge design?
Truss bridges are extremely effective because they have a high strength to weight ratio. In this experiment we have tested which type of truss bridge is the strongest, yet uses the least amount of material. Two of the most used truss bridges are of the Pratt and Howe design.
Is a taller truss stronger?
The amount a piece of wood can support in compression before buckling decreases with length. So that means the middle members will have to be made stronger the taller the bridge is. Adding strength usually means adding weight.
What is the most efficient type of truss bridge?
A Pratt Truss has been used over the past two centuries as an effective truss method. The vertical members are in compression, whilst the diagonal members are in tension. This simplifies and produces a more efficient design since the steel in the diagonal members (in tension) can be reduced.
Which truss bridge can hold the most weight?
arch bridge
What are the disadvantages of a Warren Truss bridge?
Disadvantages: The joints and fittings of a Warren truss bridge need to be checked regularly, and maintenance can be expensive. Bridges made over a long span may have many deflection flaws, which need to be corrected during the building process. Calculating the load-bearing capability can be complicated.
How much weight can a Warren Truss bridge hold?
These were a Warren Truss, a Cantilever, an Arch, a Half Through Arch, a Beam and a Gabke Stayed Truss. The bridge type that held the most weight was the warren truss bridge, holding a total of 41 pounds.
Is Warren or Pratt truss better?
Warren Truss—This is an efficient form of structure for longer lengths. Pratt Truss—This is the most structurally efficient and therefore a more economical option for longer length truss superstructures.
What are the advantages of a Warren Truss bridge?
One of the main advantages of a Warren Truss is its ability to spread the load evenly across a number of different members; this is however generally for cases when the structure is undergoing a spanned load (a distributed load).
