Understanding the concepts on Degrees of Freedom

AIM:

To compute Ln , Mn and Γn for each of the five modes from the given equations.

To calculate the effective modal mass Mn* and the modal mass participating ratio for the 5 modes.

To obtain the base shear for each of the 5 modes of vibration and the combined base shear as per SRSS rule.

RESULT:

• Calculated Ln , Mn and Γn for each of the five modes from the given equations.
• Calculated the effective modal mass Mn* and the modal mass participating ratio for the 5 modes.
• The base shear for each of the 5 modes of vibration are obtained.
• As per SRSS rule the combined base shear is obtained.
• The two modes are to be considered such that a modal mass participating ratio of 90% is obtained.