In the present study, the seismic response of multistorey structures placed on the top of a rocking storey is examined. For this purpose, an analytical model that allows the interaction of all vibration modes of the superstructure with the rocking base is introduced. As uplift of the rocking base modifies the dynamic properties of the superstructure, modal analysis is performed and the vibration mode properties during rocking are demonstrated. Subsequently, dynamic time history analyses are performed and the effect of higher vibration modes of the superstructure on the rocking response is investigated. In addition, the seismic demands of the superstructure as well as their distribution throughout the storeys are examined. The results indicate that the higher vibration modes affect the rocking response of the base, although their influence depends on the stiffness of the superstructure. Furthermore, the seismic demands of the superstructure depend primarily on the size of the rocking columns. Finally, during rocking response all the vibration modes are excited and contribute to the distribution of the seismic loads throughout the floors of the superstructure.

No abstract

No abstract

No abstract

Rocking podium structures (RPSs) refer to a wide class of structural systems in which the base storey consisting of freestanding columns that can uplift during seismic excitations. Due to the rocking response, the base storey can be considered as a base isolation system on the condition that a rocking overturn is prevented. In the present study, the seismic response of RPSs is assessed within a probabilistic framework. For this purpose, synthetic pulse‐like acceleration records are generated. The performance of several ground motion intensity measures in predicting the rocking response of RPSs with different superstructure's fundamental period, lateral displacement profiles and rocking column configuration are examined. The effect of these structural parameters on the rocking response is evaluated in terms of seismic fragility. Finally, the seismic behaviour of the rocking storey, as a seismic isolation technique, is evaluated by examining both the rocking stability and the seismic demand reduction of the superstructure simultaneously.