ABSTRACT
Metallic tie-rods are relevant structural elements in heritage masonry buildings. This chapter presents the first results of an on-going study on the mechanical characterization of ancient iron tie-rods, based on experimental tests performed on a set of real tie-rods recovered from restoration works or building demolitions. Historic metallic tie-rods are relevant structural elements in heritage masonry buildings, contributing to guarantee an efficient connection between walls and playing a decisive role in the control of horizontal thrusts. In order to identify the most relevant parameters of tierods from the seismic point of view, the models and the assessment methods usually adopted to describe their behaviour within the masonry structure should be considered. Metal tie-rods were installed in historic buildings during the construction stage in order to connect masonry walls as well as to counteract horizontal static thrusts, such as the thrust exerted by arches and vaults or by the wooden top-chords of the roof.
