When the building responses by earthquakes, the additional overturning moment the gravity load of the building produces as horizontal displacement increases. This influence called P-Δ effect is generally remarkable when the base shear coefficient is small. The purpose of this paper is to investigate the P-Δ effect on the horizontal deformation of ordinary high-rise buildings by earthquake response analysis using three types of input seismic motions (sweep wave, earthquakes specified in the notification and recorded seismic waves), and to derive response evaluation formula considering the P-Δ effect. The induced evaluation formula induced theoretically showed excellent compatibility with analytical response results.
After the 2011 off-the-Pacific coast of Tohoku Earthquake, regulatory standards for nuclear power plants were tightened. Therefore, a three-dimensional (3D) finite element model to evaluate the local response of the reactor building is currently being developed for seismic response analysis.
In order to refine the 3D finite element model, it is important to verify the correspondence to the seismic observation behaviors. In this study, the authors analyze the basic response characteristics, such as the natural frequencies and modes of the reactor building, and evaluate the effects of the amplitude of the seismic excitation on the response characteristics based on seismic observation records. This is done to clarify the behavior of a reactor building during earthquakes. These analyses will assist in quantitatively evaluating the correlation between the natural frequency of the building and the amplitude of the seismic excitation. Furthermore, the ratios of rotational displacement and displacement caused by building deformation for natural modes are discussed.
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