Truss bridges 1ra

TRUSS BRIDGES

Marc Zaragoza, Pau Haro, Marta Poy, Gemma FermĂ­n and Ahinoa Rivas.

INDEX 

WHEN THEY WERE USED FOR THE FIRST TIME?

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ADVANTAGES OF TRUSS BRIDGES

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DISAVANTAGES OF TRUSS BRIDGES

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COMPRESSION FORCES IN TRUSS BRIDGES

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TENSION FORCES IN TRUSS BRIDGES

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WHAT ARE THEY USED FOR?

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QUEBEC BRIDGE

WHEN WERE THEY USED FOR THE FIRST TIME? 

Wooden truss bridges were used as early as the 1700s.

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But the first metal one was completed in 1841.

ADVANTAGES OF TRUSS BRIDGES 

They are very strong.

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They are frequently used as draw bridges.

DISAVANTAGES OF TRUSS BRIDGES 

They are difficult to construct.

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They have a high maintenance.

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It is difficult to widen if it’s necessary.

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Generally, they are not considered attractive.

COMPRESSION FORCES IN TRUSS BRIDGES As traffic pushes down on the roadway, compression acts on the upper horizontal members of the truss structure.

TENSION FORCES IN TRUSS BRIDGES Tension acts on the bottom horizontal members of the truss structure. The forces of tension and compression are shared among the angled members.

WHAT ARE THEY USED FOR? ď ľ

They are very strong and have been used for railroad bridges mainly because of the heavy loads they can support.

This truss bridge is located in Tortosa.

It was used as a railroad.

QUEBEC BRIDGE

Quebec bridge is considered world’s top longest truss bridge.

It is 987 meters long.

It was opened in 1919.