Understanding the concepts on Degrees of Freedom

1.Aim: To evaluate the modified mass matrix(Mn),Modal property (Ln), Modal participation factor for the five nodes of the five storey building.

Modal mass participating ratio for the five modes :

Base shear for the individual mode and average base shear of the building :

Base shear is the product of the effective modal mass and the pseudo accelaration.Pseudo accelaration is evaluated from the graph plotted with the time period of vibration.