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# Bridgething2

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### Bridgething2

1. 1. The Suspension Bridge In it’s simplest form the suspension bridge can basically be made from rope and wood. This type of bridge has been around for a while it first being introduced in the late 19th century. There are many positives to this bridge including the fact its very light, a lot stronger than some other bridges, it can span distances from 600 to 2,000 meters longer than any other kind of bridge, it’s the best for going over busy water ways and its less materials than basically any other bridge, however is still does cost a lot to build. There are other downsides, which include the fact it can’t take large loads and the wind has a large impact on the stability bridge. The positives defiantly outweigh the negatives. The Bowstring Bridge The Bowstring Bridge is a type of arch bridge because it shares the same arch design over the top of the bridge. This arch on the bridge gives it a high resistance to bending forces such as wind. These bridges are also very good for long distances and are able to be made mostly from local resources. However this bridge can cost a lot of money and the foundations have to be adequate or else the bridge will not stay stable. DESIGN Our group agreed on designing The well known ‘Golden Gate Bridge’
2. 2. our bridge as an Arch Bridge. We chose this design because it allows the stress of the weight being placed on it to be distributed evenly along to length of the bridge, which ultimately means it can hold more weight, and is overall stronger. Another reason we chose this design is because it looked challenging, which proved to be true. METHOD 1. Move two tables approximately 20cm apart. Once you have this gap do not change it 2. To begin constructing an arch bridge, start by constructing a beam bridge by simply cutting into shape a piece (or multiple stuck together for strength) into shape. 3. Build the arch by connecting straws and bending it over connecting each end to an end of the bridge lengthways. Do this the same on both sides 4. Cut straws into the sizes need to reach from the bridge to the arch about a centimeter apart and stick them on with a hot glue gun. 5. Construct a base for it by making pop sticks into a support structure as seen in the picture below and connect it to the bottom of your bridge using a hot glue gun. 6. Add 50g masses beginning at the center of your bridge until the bridge breaks or falls. RESULTS What a your finished product should resemble