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Gdańsk University of Technology

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Analysis of the effect of the seismic gap on the response of buildings experiencing pounding during earthquakes

The aim of this paper is to investigate the effect of the seismic gap on the dynamic response of buildings experiencing earthquake-induced pounding. Three buildings have been analysed, which are 5-storey, 7-storey and 9-storey structures. Three possible pounding scenarios have been considered, which are pounding between 5-storey and 7-storey buildings, pounding between 5-storey and 9-storey buildings and pounding between 7-storey and 9-storey buildings. Three seismic gaps between these three buildings have been investigated, which are 1 mm (contact structures), 2 cm and 2 m (separated structures). The results of the study show that the acceleration and pounding force time histories are significantly affected by the seismic gap. Moreover, not necessarily smaller gaps lead to smaller accelerations and pounding forces. It has been observed that the response is larger for small gaps in certain cases, while the response is larger for large gaps in other cases. This means that increasing the gap will not reduce the response unless it is large enough to eliminate collisions.

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