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Bridge Project: AP Physics Of Arch Bridges

530 Words3 Pages

Tony Li
Walker
AP Physics I - 7th
10 December 2014
Bridge Project Arch bridges are created by building an “arch” with two pillars of stone that lean on each other and are attached by a keystone. When a load is put on the bridge, the force of the weight spreads across the two parts of the arch and reduces the force on the top as it does not focus straight downwards. The ground pushes onto the supports, or abutments, and the force is transferred upwards to the keystone to focus in one spot and support the load. Arch bridges can be hard to build as the two abutments of the bridge can not stand by themselves until they are connected at the keystone. Despite being difficult to build, the arch structure proves its utility by effectively spreading the force on top of the bridge. Truss bridges are made of triangular patterns that are connected at nodes on the bridge platform. Truss bridges require careful maintenance and building truss bridges is very labor intensive as multiple trusses must be constructed to build the bridge. The trusses hold together the bridge and counteract the forces of tension and compression on the bridges surface to prevent the bridge from breaking. They also absorb some of the force of the weight of objects on the bridge. …show more content…

The cables’ tensional force transfers the force of the weight of objects on the bridge to the towers which move the force into the ground. The bridge receives an upward force from the tension of the cables that serves to counteract weight. Despite their strength, suspension bridges suffer from weakness to severe weather conditions and destruction through frequent shaking in a process known as “resonance”. However, the sturdiness of suspension bridges still proves useful for building long bridges that can withstand a large amount of vertical

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