... e.g. materials matters, forces (compression, tension) acted, resonance, thermal expansion. Bridges can twist or bend under severe weather conditions which can have disastrous consequences. In order to prevent this from happening bridges must be stiff enough to resist this movement and each member from which the bridge is made must be strong enough to withstand the load which is placed upon it. So the Physics included in material are also relevance, e.g. young modulus, stress & strain. Deciding bridge types: First of all, we will be looking at the 4 major types of Bridges; The beam bridges, the arch bridges, the Cantilever bridges & the suspension bridges. The type of bridges used depends on various features of the obstacle. The main feature that controls the bridge type is the size of the obstacle. The biggest different between each type of them is the distance they can cross between ...

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