Harbour Bridge
The Harbour Bridge is strong because it has triangles. Triangles make for a strong structure because the work off compression and tension. Triangles on the harbour bridge are in the arch because the arch need to be strong in order to keep the bridge up and carry the load. An arch is useful because it transfers the load instead of focusing the load on one spot. By encompassing these two feature it make the harbour bridge a through arch steel bridge which is designed to last long and hold a lot of weight.
Anzac Bridge
The Anzac Bridge is situated in Sydney. It is a cable-stayed bridge. It has cables attached to the roads to keep them up. The bridge has eight lanes. It carries bikes cars and pedestrians. It is made up of steel and concrete. its span is 805m and the highest point is 120m. It is a strong bridge because of the materials used and the cords situated through out the bridge disperses its weight effectively