Structural Dynamics Analysis Using Non-Uniform Fast Fourier Transform in Frequency Domain

Nonuniform seismic motion affects the seismic behavior of large structures such as long-span bridges. Three main reasons for this nonuniformity have been identified. They are local soil conditions, wavepassage, and incoherency effects. Other effects, such as extended source and attenuation, are relativelysmall. The importance of nonuniform seismic motions, especially for sensitive and important structures, has led to the development of several methods of analysis. This paper presents a direct frequency-domain method that is based on neural network and optimization. The use of this direct frequency-domain methodfor solving nonuniform seismic motions is shown. Finally, the application of the proposed method to asimple multiple particle damped system under harmonic loading is presented and the validity and feasibility of the transformation algorithm in time-domain and frequency-domain are numerically verified

کلیدواژه ها:

Structural dynamics ، Seismic wave ، Nonuniform fast Fourier transform ، Neural network ، Optimization