Table of Contents
1. Ikitsuki Bridge, 400-meter main span, Japan, opened 1991.
What type of truss bridge is strongest?
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.
Which truss bridge holds the most weight?
The arch bridge can hold the most weight, the deck bridge can hold an average amount of weight, and the beam bridge can hold the least amount of weight.
What kind of truss is the strongest?
No Single Strongest Truss No single style of truss is intrinsically stronger than another. The most common styles, Fink or W and Howe or K, along with a related type called fan, are the basis for most truss styles. All have angled top rafter chords and horizontal bottom beams or chords.
What type of bridge is the strongest?
Even though the truss bridge design has been around for literally centuries it is widely regarded as the strongest type of bridge.
Is Howe or Pratt truss stronger?
The Howe truss had an average load-to-mass ratio of 512.61 and deflected 13.23 mm on average. The Pratt truss had an average load-to-mass ratio of 528.93 and deflected 9.53 mm on average. The Pratt truss deflected the least and had the highest load-to-mass ratio.
Is the Warren Truss the strongest?
The warren-truss design worked best. It held a high of 66 pounds and the average weight held was 43.6 pounds. The k-truss design held an average of 31 pounds, the pratt design had an average of 13.6 pounds.
Are Taller trusses better?
By increasing the height, the load decreased on the top and bottom chords but remained the same on the middle “truss members”. By increasing the height, the middle members have to become longer. That inherently adds weight. However, bridge builders have another problem when pieces become longer.
What is a Warren bridge?
The Warren Truss is a very common design for both real and model bridges. The Warren Truss uses equilateral triangles to spread out the loads on the bridge. This is opposed to the Neville Truss which used isosceles triangles. The equilateral triangles minimize the forces to only compression and tension.
Why is the truss bridge the strongest?
Load-bearing capacity of truss bridges is huge due to the structure of interconnecting triangles. The structure effectively manages both compression and tension by spreading the load from the roadway throughout its intricate structure.
What is a Pratt bridge?
: a truss having vertical members between the upper and lower members and diagonal members sloping toward the center.
Why is a Howe truss good?
Thus, because the diagonal members are longer, the Howe truss used less of the more expensive iron material. It made good use of the cheap wood which was readily available. For model bridges, we typically only use wood. Our compression and tension members are both made out of wood.
What is K truss bridge?
The K Truss design was a variant from the Parker truss design. The idea of the K truss is to break up the vertical members into smaller sections. This is because the vertical members are in compression. The shorter a member is, the more in can resist buckling from compression.
Which bridge design is the weakest?
We did further research after our experiment and learned that beam bridges are actually the weakest of all bridges and suspension bridges are the strongest.
Which bridge is stronger truss or arch?
Based on the incremental deflection averages, the truss bridge is 10.0736 stronger than the span/beam bridge and 3.4561 stronger than the arch bridge. It is concluded that the truss bridge was the strongest from its increased weight and its geometric design of spreading the compression with a triangular design.
What type of bridge is the strongest science project?
Overall the beam bridge appeared to be the strongest type, although the truss bridge was more rigid up until the point of failure.
What is the strongest Popsicle stick bridge design?
The triangle design is “stronger”—the popsicle sticks are arranged in such a way in this shape that when you push or pull on them, none of them can rotate.
What is a Baltimore truss?
The Baltimore truss is a subclass of the Pratt truss. A Baltimore truss has additional bracing in the lower section of the truss to prevent buckling in the compression members and to control deflection. It is mainly used for rail bridges, showing off a simple and very strong design.
What is the most efficient truss design?
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.
Who designs the Pratt truss bridge?
For simplicity of construction, rapidity of erection, and ease of replacing parts, it stands without rival” (DeLony 1994:11). In 1844 Caleb Pratt, an architect, and his engineer son Thomas designed the Pratt truss, another truss from this period that had widespread significance.
