Response of tall buildings to base rocking induced by Rayleigh waves |
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| Authors: | Kristel C Meza Fajardo Apostolos S Papageorgiou |
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| Institution: | 1. Seismic and Volcanic Risk Unit and Risk and Prevention Division, BRGM, Orléans Cedex 2, France;2. Department of Civil Engineering, University of Patras, Patras, Greece |
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| Abstract: | By now, it is well known that long‐period surface waves can induce resonant response in high‐rise buildings, in particular those located in sedimentary basins. Rayleigh wave passage has been reported to induce rocking motion at the base of the buildings which can increase displacement demands significantly. However, the building behavior to base rocking has not been extensively studied because commercially available instruments do not record rotational components of ground motion, and thus, rocking time histories have not been available to the analysts. In a recent study, we proposed an effective method for estimating the rocking associated with Rayleigh waves, which takes into account their frequency‐dependent phase velocities. In the present work, we select a number of recorded seismic motions which include surface waves on sedimentary basins from recent well‐recorded earthquake events. Then, we proceed to identify and extract the recorded surface waves by using the technique mentioned above. Using realistic soil‐structure analytical models that have been proposed in the published literature for high‐rise buildings, we study their response to Rayleigh waves as they respond to both translational and rocking motions. Of particular interest is to compare the response of such structures with and without the presence of rotational motions due to surface waves. Using the roof displacement and the building interstory drift as response quantities, our results indicate that demands are controlled by rotational (rocking) motions associated with Rayleigh waves. |
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| Keywords: | high‐rise buildings interstory drift nonuniform stiffness rocking soil‐structure interaction surface waves |
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