CHANGE THE FREQUENCY CHARACTERISTICS OF THE EARTHQUAKE ACCELERATION WAVE BY FOURIER ANALYSIS

The earthquake acceleration time history was required a basis to determine the earthquake loading for the building structure design. For the purpose of adjusting to the soil condition and seismicity of the specific site, then the frequency characteristics of the time history need to be changed. To achieve this goal, it has been developed the computer program to change the frequency characteristics of the earthquake acceleration time history based on spectral matching analysis by the Fourier analysis. In the analysis, it was needed an actual time history and a target spectrum. Results of the study are that matching spectrums very close to target spectrums. The errors are quite small, well below as acceptable in civil engineering requirement.