EFFECT OF DIFFERENT BASELINE CORRECTION METHODS ON THE GROUND ACCELERATION SIGNAL

Author

Sagar Singh Raikhola, Southern Illinois University CarbondaleFollow

Date of Award

5-1-2019

Degree Name

Master of Science

Department

Civil Engineering

First Advisor

Tezcan, Jale

Abstract

The main objective of this study is to compare the effect of different baseline correction methods on the ground acceleration signal and on the seismic response of structures. Three for strong ground motion processing methods, namely, Chiu, Akkar and EERL methods were selected in this study. For each method, a MATLAB code was written, and used in processing ground motions recorded at Belmont, IL and Gorkha, Nepal. The processed acceleration, velocity and displacement time histories obtained from the MATLAB Code were compared to the time histories provided on the USGS website. Next, the effect of each method on the response spectra was examined for five different damping ratios. A numerical integration scheme called the state-space method was used in computing the time-domain response. Finally, to get an understanding of how the processed accelerations will affect a real structure, a four-story steel frame was modeled using RISA 3D software. The response of the frame was computed using time-history analysis and the resulting story displacements were compared, and implications for structures with different natural periods were discussed