... degrees of freedom because we need to describe the movement of each floor separately in order to describe the movement of the whole structure Introduction to Dynamics of Structures Washington University ... Dynamics of Structures, Prentice Hall, N.J., 1995 HUMAR, J L., Dynamics of Structures, Prentice Hall, N.J., 1990 PAZ, M., Structural Dynamics, Chapman & Hall, New York, 1997 Introduction to Dynamics ... function of the structure to determine the amount of damping for each mode Introduction to Dynamics of Structures Washington University in St Louis 2.4.1 Exponential decay Using free vibration data of...