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http://dx.doi.org/10.5000/EESK.2006.10.3.065

Modal Combination Method for Prediction of Story Earthquake Load Profiles  

Eom, Tae-Sung (포항산업과학연구원 강구조연구소)
Lee, Hye-Lin (서울대학교 공과대학 건축학과 대학원)
Park, Hong-Gun (서울대학교 공과대학 건축학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.10, no.3, 2006 , pp. 65-75 More about this Journal
Abstract
Nonlinear pushover analysis is used to evaluate the earthquake response of building structures. To accurately predict the inelastic response of a structure, the prescribed story load profile should be able to describe the earthquake force profile which actually occurs during the time-history response of the structure. In the present study, a new modal combination method was developed to predict the earthquake load profiles of building structures. In the proposed method, multiple story load profiles are predicted by combining the modal spectrum responses multiplied by the modal combination factors. Parametric studies were performed far moment-resisting frames and walls. Based on the results. the modal combination factors were determined according to the hierarchy of each mode affecting the dynamic responses of structures. The proposed modal combination method was applied to prototype buildings with and without vertical irregularity. The results showed that the proposed method predicts the actual story load profiles which occur during the time-history responses of the structures.
Keywords
modal superposition; earthquake loads; dynamic response; seismic analysis; earthquake engineering;
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