The steel frame shown in Figure M-1 supports a rotating machine that exerts a horizontal force at the girder level ?(?) = 200 sin 7.2? lb. Assuming 8% of critical damping, E = 29,000 ksi and I = 75.3 in4 , determine the following: Stiffness, ? = _____________________ Frequency ratio, ? = _______________________ Maximum Static Deformation, (???)? = _____________________ Dynamic Magnification Factor, ?? = _______________________ Steady-state Amplitude, ?? = _________________________
The steel frame shown in Figure M-1 supports a rotating machine that exerts a horizontal force at the girder level ?(?) = 200 sin 7.2? lb. Assuming 8% of critical damping, E = 29,000 ksi and I = 75.3 in4 , determine the following: Stiffness, ? = _____________________ Frequency ratio, ? = _______________________ Maximum Static Deformation, (???)? = _____________________ Dynamic Magnification Factor, ?? = _______________________ Steady-state Amplitude, ?? = _________________________
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
The steel frame shown in Figure M-1 supports a rotating machine that exerts a horizontal
force at the girder level ?(?) = 200 sin 7.2? lb. Assuming 8% of critical damping, E = 29,000
ksi and I = 75.3 in4
, determine the following:
Stiffness, ? = _____________________
Frequency ratio, ? = _______________________
Maximum Static Deformation, (???)? = _____________________
Dynamic Magnification Factor, ?? = _______________________
Steady-state Amplitude, ?? = _________________________
Transcribed Image Text:15 Kips
Fler
W8 x 20
I
L- 15'
21
Figure M-1
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