A platform of weight = 5000 lb is supported by four identical columns (E = 29000ksi, I = 69.2 in4) with a length of 12 ft, assumed to have fixed supports. It was determined from a free vibration test that the ratio of displacements three cycles apart is 10.237. Duringan earthquake, it was determined that the maximum force was 50 lb. It was also observedthat a cycle of oscillation occurs every 3.979 s. The earthquake lasted for 15 s. What is the displacement 10 s after the earthquake stopped? HINT USING THREE MOMENT EQUATION
A platform of weight = 5000 lb is supported by four identical columns (E = 29000ksi, I = 69.2 in4) with a length of 12 ft, assumed to have fixed supports. It was determined from a free vibration test that the ratio of displacements three cycles apart is 10.237. Duringan earthquake, it was determined that the maximum force was 50 lb. It was also observedthat a cycle of oscillation occurs every 3.979 s. The earthquake lasted for 15 s. What is the displacement 10 s after the earthquake stopped? HINT USING THREE MOMENT EQUATION
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A platform of weight = 5000 lb is supported by four identical columns (E = 29000ksi, I = 69.2 in4) with a length of 12 ft, assumed to have fixed supports. It was determined from a free vibration test that the ratio of displacements three cycles apart is 10.237. Duringan earthquake, it was determined that the maximum force was 50 lb. It was also observedthat a cycle of oscillation occurs every 3.979 s. The earthquake lasted for 15 s. What is the displacement 10 s after the earthquake stopped?
HINT USING THREE MOMENT EQUATION
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