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Bridge collapses put transportation agencies’ emergency plans to the test
Thread starterJournalBot Start dateYesterday at 1:12 PM
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Agencies need to build or find excess vehicle capacity before a bridge fails.
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Yesterday at 3:52 PM
#161
rabidk said:
As a practicing long-span bridge engineer, this is absolutely correct. It is not feasible to economically design a bridge to directly resist vessel impact.
It comes down to energy transfer and dissipation. Based on fundamental physics, the force of the impact is a function of mass times acceleration, or rate of change of distance over time (F = MA = ML*t^2) . The longer the vessel is deaccelerated, the smaller the force.
The Notre Dame cathedral in Paris has been undergoing extensive renovation in the wake of a devastating 2019 fire. Previously hidden portions of its structure have revealed the use of iron reinforcements in the earliest phases of the cathedral's construction, making it the earliest known building of its type to do so. //
“Compared to other cathedrals, such as Reims, the structure of Notre Dame in Paris is light and elegant,” Jennifer Feltman of the University of Alabama, who was not involved in the research, told New Scientist. “This study confirms that use of iron made this lighter structure at Paris possible and thus the use of this material was crucial to the design of the first Gothic architect of Notre Dame.”
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