Abstract
Using ABAQUS to analyze the response of tall building under expected rare earthquake, usually the gravity field can be derived by the implicit method as the initial condition of simulation for seismic wave executed in the explicit method. In practice of engineering, oscillation of gravity often occurred at the beginning of explicit method which would lowered accuracy and reliability of time-history results. Three main reasons including stress level, constitutive model and the software ABAQUS itself are researched in this paper by numerical examples, and an extra analysis step is proposed for eliminating oscillation before loading the seismic wave.
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