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One Hundred Years of Suspension Bridges: From the Era of the Brooklyn Bridge to Today

Both bridges possess a dominant center span and shorter sidespans. The bulk of the bridges’ weight is carried by parabolic cables which are so small in diameter relative to the rest of the bridge geometry that they are functionally pieces of string. The towers carry the weight of the bridge and windloads to the foundations. To some extent they resist the cable pull, but this is a relatively unimportant function that could be performed by other parts of the structure. Both bridges have anchorages that dead-end the cable. Vertical suspenders hang the roadway from the cable in both bridges. Although they are intended to carry vertical loads, the suspenders transmit a surprisingly large part of the wind pressure on the roadway to the cables. Both bridges have stiffening trusses, a floor system, and a roadway.