ABSTRACT
As seen today, the bell-tower of the Cathedral of S.Andrea in Portogruaro, also known as CivicTower, is a 59 m tall leaning campanile. The building was probably started in the XIII century. The tower was recently surveyed by Busetto & Romanin (2001) using theodolite and diastimeter, and the main geometrical features are shown in Figure 1. From the architectural point of view the Tower has a masonry column, a belfry and a spire. The column has a roughly square cross section, of size varying with height, from 7.30 m on a side at ground level to 6.45 m at the top. The walls are masonry infilled, with thickness varying from 1.3 m at the base to 0.9 m at the top. There are four wooden floors at levels 5.58 m, 12.07 m, 18.45 m and 22.74 m, and an old masonry cross vault, now reinforced with a concrete slab, at level 26.20 m. The main column ends with a second cross vault, similar to that below, which supports the floor of the belfry, at level 31.43 m. The belfry balcony carries an octagonal tambour 5.45 m in diameter and 4.9 m height, in turn topped by a pyramidal spire 15.84 m in height overall.
