Influence of connections in the seismic behaviour of trilithic large blocks masonry structures

This chapter investigates the response of a multi-drum stone colonnade to horizontal forces by means of distinct elements and considers different models. The colonnade is made with large blocks in simple contact between them; the top block of each column supports the upper architrave. The research focuses on the behaviour of block constructions, defined as buildings made of stone elements of significant size compared to those of the entire structure and without connecting material. The interaction between the blocks was represented using a zero thickness interface characterized by a normal elastic stiffness, shear stiffness and the angle of friction. In addition to the static safety for the artifacts belonging to the cultural heritage, controls on their vulnerability to seismic forces should be performed too. It is well known that the study of vulnerability must fully understand the nonlinear behaviour of the structure, and must be able to describe the phenomena of swinging, sliding and toppling of the blocks.