This paper studies the dynamic behaviour of rigid-block structures under seismic
behaviour. For this purpose, an experimental investigation has been carried out on the rocking
response of single blocks, and ensembles of two and three blocks structures. These structures
were subjected to three different base motions: free rocking, harmonic and random excitations.
The tests were performed at the seismic table of the National Laboratory of Civil Engineering
(LNEC) of Portugal.Project ECOLEADER Group 4.Fundação para a Ciência e Tecnologia - SFRH/BPD/17449/2004; SFRH/BD/9014/2002