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A model for Mass Isolation study in seismic design of structures

A variety of new approaches in seismic design of structures are based on improving the flexibility and energy dissipation potentials of the system. In these approaches the existence of large energy dissipaters in the system and the structural mechanism that supports the reaction forces of these devices make the current single degree of freedom model inaccurate in analytical investigations on the behavior of such systems. In this work a two degrees of freedom model is introduced to improve the accuracy of such studies. The model is an extension of the Maxwell three element type model in structural dynamics. Non‐classical Eigenanalyses on the model reveals the key role of energy‐dissipating devices in the determination of main dynamic characteristics of such systems. A large number of dynamic time integration analyses subjected to earthquake motions were carried out on the model. In analyses, the model was proportioned in different configurations to exemplify short, medium height and tall buildings. Energy dissipation in the model was based on using viscous devices in the form of linear, nonlinear and controllable dashpots in all configurations. The results of analyses show the difference between structural performances of short and tall buildings in terms of damping capacity in the system. The results also provide an insight on the role of modern dashpot technologies in the design philosophy and structural performances of these highly damped structural systems. Copyright © 2011 John Wiley & Sons, Ltd.