This study is aimed to determine the ideal seismic gap distance that should be between the structures to prevent collisions with each other as a result of the displacements of two adjacent base-isolated structures under different earthquake effects. A total of three adjacent building models were created by adding structures with reduced mass and increased mass with the same characteristics of a base-isolation system. In that case, the uncertainty of variable loading of the structures is considered. The dynamic analyses of three different adjacent structures were carried out for two different periods of base isolation system and under different earthquake records. As a result of the analysis, the displacements and accelerations of the three adjacent structures were determined. The seismic gap distances between structures at different periods for the base isolation and with different masses were compared. It has been found that the maximum seismic gap distance among adjacent structures is between the structure with increased massed structure and the main structure. Also, it is high when the period for the base isolation is high.
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