The rocking response of freestanding slender blocks to earthquake ground shaking is consid-ered in the slope stability analysis of rock blocks, completely detached from the cliff and logged upon a horizontal plane. The horizontal and vertical seismic accelerations of a large da-tabase of recorded earthquake motions on rock soil (from US, Europe and Asia) have been used as input of a two-dimensional mechanical model implemented using a state space formu-lation. The model is able to solve the equations governing rocking problem accounting for the energy loss at every impact, to evaluate the block overturning (instability) or the rocking mo-tion with smoothly rotations from one edge of the base of the block to the other. The records of the studied database cover a wide range of key characteristics in order to evaluate the ef-fects on toppling of various seismic parameters such as PGA, PGV, Arias Intensity, energy flux, frequency content. The results in terms of stability of the dynamic numerical model are compared with the ones obtained by the pseudo-static approach, carried out considering static horizontal accelerations equal to the peak ground accelerations.
On the stability of slender rock blocks subjected to horizontal and vertical seismic accelerations
Adinolfi, Marianna;Maiorano, Rosa Maria Stefania;Aversa, Stefano
2019-01-01
Abstract
The rocking response of freestanding slender blocks to earthquake ground shaking is consid-ered in the slope stability analysis of rock blocks, completely detached from the cliff and logged upon a horizontal plane. The horizontal and vertical seismic accelerations of a large da-tabase of recorded earthquake motions on rock soil (from US, Europe and Asia) have been used as input of a two-dimensional mechanical model implemented using a state space formu-lation. The model is able to solve the equations governing rocking problem accounting for the energy loss at every impact, to evaluate the block overturning (instability) or the rocking mo-tion with smoothly rotations from one edge of the base of the block to the other. The records of the studied database cover a wide range of key characteristics in order to evaluate the ef-fects on toppling of various seismic parameters such as PGA, PGV, Arias Intensity, energy flux, frequency content. The results in terms of stability of the dynamic numerical model are compared with the ones obtained by the pseudo-static approach, carried out considering static horizontal accelerations equal to the peak ground accelerations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
