The frame shown below is subject to a short duration earthquake causing the supports of the frame move horizontally with an acceleration indicated in the figure. Note that T is the natural period (inverse of natural frequency). The damping ratio of the frame is 1%

(EI) _AB = (EI) _CD = 10 ⁷ kip-in. ²

1. Model the system and find its damped natural frequency.

Transcribed Image Text:

30 ft. B 60 kips 30 ft. 24 ft üs/g 0.2 T/4 T/2 t, sec 30 ft. B 60 kips 30 ft. 24 ft üs/g 0.2 T/4 T/2 t, sec

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