National Boards > Bridges

Will Continental Drift Ever Affect Bridges?

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Mike2357:
Given that the continents are shifting an inch or two every year, could this ever end up straining the structural supports until they collapse? If for example, Long Island started drifting east away from Manhattan, would the Brooklyn Bridge ever snap?

NE2:

Not in the U.S. except on the west coast, but maybe it would be an issue for a Gibraltar bridge.


http://www.atlasobscura.com/places/midlina-bridge-between-continents

Evan_Th:

--- Quote from: NE2 on August 14, 2021, 02:54:29 PM ---Not in the U.S., but maybe it would be an issue for a Gibraltar bridge.

--- End quote ---

The San Andreas Fault is already causing minor damage to California roads.

kalvado:
Plates boundaries are seismic regions, and construction has to account for that.
An example which comes to mind is Akashi-Kaikyo bridge in Japan. An earthquake occured during bridge construction, things moved,  and final geometry of the bridge was a few feet longer than originally planned.


--- Quote ---Of particular interest was the performance of the bridge in the January 17, 1995, Hyogo-ken Nanbu Earthquake, which provided a full-scale test of tower response. The earthquake caused a permanent lateral and vertical offset of the Awaji tower and anchorage. This resulted in a 0.8-m increase in span length between the main towers and a 0.3-m increase in the southern side span length. The increased distance between towers was accommodated by the redesign of the two center stiffening panels, which are 0.4 m longer than originally designed. The earthquake caused a one-month delay in the construction schedule during which the bridge was carefully inspected. The lost time was made up during the remaining 3-year construction period, and the bridge was opened on schedule.
--- End quote ---

Max Rockatansky:

--- Quote from: Evan_Th on August 14, 2021, 02:58:07 PM ---
--- Quote from: NE2 on August 14, 2021, 02:54:29 PM ---Not in the U.S., but maybe it would be an issue for a Gibraltar bridge.

--- End quote ---

The San Andreas Fault is already causing minor damage to California roads.

--- End quote ---

There is a bridge in Parkfield which has a noticeable bend in from the San Andreas Fault moving.

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