Discussion
Spatial variation of ground motion is important for
Answer: A
Correct answer: long structures such as bridges and pipelines
A structure whose supports are hundreds of metres apart does not see the same motion at every support: the wave arrives at different times, is incoherent over that distance, and may cross different ground conditions. The resulting differential displacements impose forces that a single-support analysis misses entirely, which is why multi-support excitation is used for long bridges and buried pipelines.
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