Discussion
Soil behaviour under strong shaking is described as non-linear because the
Answer: C
Correct answer: stiffness falls and damping rises as strain increases
Soil is linear only at very small strains. As shaking intensifies the shear modulus falls, sometimes to a small fraction of its initial value, while hysteretic damping rises. Both effects lengthen the site period and limit the amplification, so a soft site that amplifies a weak motion greatly may amplify a strong one much less.
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