GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione A matrice 61 For what concern masonry buildings, generally speaking, better quality of the walls’ corners is visible allowing a more effective connection, less cases of addition of storeys are found and tie rods to restrain the walls are not so widespread. It is worth noting that masonry walls seems to be made of limestone elements without travertine elements meaning a higher compressive strength, although this latter is also related to the quality of the mortar that cannot be checked. Summarizing, the better material (limestone), better corners’ connection and less presence of RC floors lead to state that Vezzano masonry building are less vulnerable than Pescara del Tronto ones. Geophysical survey in Pescara del Tronto and Vezzano. Ageophysical survey was carried out with the aim to distinguish sites where enhanced local damages were due to lower quality buildings and/or to local geo-structural settings responsible for ground motion amplifications. In particular, five geophysical techniques were performed (Fig. 2): 1. ��� ���������� ����������� ���������� ����� ������ ����� ����� n.1 Electrical Resistivity Tomography (ERT) (Loke, 2001; Galli et al. , 2006; Giocoli et al. , 2011); 2. �� �� ������ ������� ����� ������������ ����������������������� ����� �������� ������ n. 14 single station noise measurements (Horizontal-to-Vertical Noise Spectral Ratio, HVNSR) (Bonnefoy-Claudet et al. , 2006; EVG1-CT-2000-00026 SESAME, NATO- SfP980857) with 20 minutes of recordings sampled at 128 Hz by Tromino equipment (Moho srl); single and multi station noise measurements (Bonnefoy-Claudet et al. , 2006; EVG1-CT-2000-00026 SESAME, NATO-SfP980857); Fig. 1 – a) Buildings with collapsed masonry walls in Pescara del Tronto; b) undamaged buildings in the main square of Vezzano village; c) building with two added floors made of hollow bricks in Pescara del Tronto; d) Buildings with good quality corners in Vezzano.