Seismic Performance of High-Rise R/C Structures Subjected To Vertical Earthquake Motion

Abstract eng:
This study is aimed at determining earthquake performance of RC structures under the vertical ground motion. The timehistory analysis of a high-rise R/C structure designed in compliance with the Turkish Seismic Code requirements was conducted including and excluding the vertical earthquake motion. The earthquake records were selected according to the ratio of the vertical peak acceleration to the horizontal peak acceleration (V/H). Frequency content of the ground motions were also identified to investigate their influence on seismic performance of the structure. Based on the results of previous linear time-history analyses, the earthquake performance of the structure was estimated to change with varying the V/H ratio and earthquake duration since higher vertical accelerations were found to induce higher overturning moments at the base of the structure. Considering this conclusion, failure investigation was conducted to evaluate the earthquake performance of the high-rise R/C structure. In order to determine the effect of vertical seismic action on earthquake performance, earthquake loading conditions including the horizontal (H) and the vertical (V) earthquake motion were also taken into account. The earthquake performances of the structure under both of (H) and (H+V) loading conditions were examined and the results were compared. These comparative results indicated that the desired earthquake performance level of the structure could not be provided under (H+V) loading condition, and that damage level of the structures subjected to (H+V) loading was more severe than that of (H) loading. The current study indicated that the earthquake resistant design philosophy and the corresponding retrofitting approach should be specified by also taking the vertical earthquake motion into consideration.

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