NEHRP Clearinghouse
 Title
 Optimal Design of an Earthquake Isolation System.
 File

PB294735.pdf
 Author(s)
 Bhatti, M. A.; Pister, K. S.; Polak, E.
 Source

National Science Foundation, Washington, DC.,
October 1978,
120 p.
 Identifying Number(s)
 UCB/EERC78/22
 Abstract
 Optimal design of an earthquake isolation system, consisting of natural rubber bearings and special nonlinear energy absorbing devices, is presented. An algorithm for efficient analysis of structural response, based upon the Newmark and RungeKutta methods with optional NewtonRaphson iteration, is given. The optimal design problem, incorporating this simulation algorithm, is formulated as a mathematical programming problem with timedependent constraints and is solved using a feasible directions algorithm. Several numerical examples are presented, in which it is demonstrated that a properly designed isolation system can substantially reduce structural damage for a class of potential earthquakes.
 Keywords
 Seismic design; Earthquake resistant structures; Energy absorption; Mechanical hysteresis; Mathematical models; Structural design; Buildings; Earthquake engineering; Ground motion; Dynamic structural analysis