DYNAMIC ANALYSIS USING THE SUPERPOSITION OF MODES AND HORIZONTAL EARTHQUAKE SPECTRA: COMPARISON WITH STATIC ANALYSIS IN THE EXAMPLE OF A 20-STOREY BUILDING

Authors : Bashar Hammoodi Khalaf Al-janabı

Pages : 37-62

Doi:10.53600/ajesa.1347458

View : 30 | Download : 7

Publication Date : 2025-06-30

Article Type : Research Paper

Abstract :This paper applied the three earthquake analysis methods for analyzing the response of 20-storey building, the paper provides a comparison study between dynamic and static analysis methods to evaluate the level of accuracy when using the static method, where system and ground motion parameters addressed in the Iraqi code for the city of Baghdad are used in this study. The study compared the results of Equivalent Lateral Force Analysis (ELFA) and Response Spectrum Analysis (RSA) with Time History Analysis (THA). Therefore, the aim of the study is to compare the results of ELFA with THA applied by using superposition of modes and artificially earthquake accelerations scaled to the site design spectrum in order to compare the results of ELFA for the example of 20-storey building, the study concluded that static analysis is not directly sufficient for 20-storey building, because it has been showing inaccurate response results, where it shows a lower design base shear if compared with elastic base shear obtained from dynamic analysis further to inaccurate displacements results. Finally, dynamic analysis leads to more seismic resistant design than static analysis if used with a desired ductility and desired strength modifications factors.
Keywords : Earthquake, Static, Dynamic, Response, Baghdad, Iraq

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