Effect of Ground Motion Characteristics on the Seismic Response of Torsionally Coupled Elastic Systems

摘要

A probabilistic approach to a study of the effects of ground motion on torsionally coupled elastic systems is presented. The characteristics of ground motions are discussed and frequency content, time varying intensity and duration, and direction are modeled. Isolated acceleration pulses and ground motion spatial correlation characteristics are illustrated with a simple white noise model. The methods used for computing structural responses to the ground motion models are described and an algorithm is devised for evaluating the nonstationary response statistics of general multi-degree-of-freedom systems to the excitations of various models. The effects of various ground motion characteristics on single-degree-of-freedom systems are considered as are the effects of ground motion on the response of single-story torsionally coupled systems. Also noted are the responses of a special class of torsionally coupled tall buildings. A numerical example for an eight-story building is provided.