GNGTS 2019 - Atti del 38° Convegno Nazionale

GNGTS 2019 S essione 2.2 439 Forte G., Chioccarelli E., De Falco D., Cito P., Santo A., Iervolino I. (2019) - Seismic soil classification of Italy based on surface geology and shear-wave velocity measurements. Soil Dynamics and Earthquake Engineering 122, 79–93. Iwahashi J., Kamiya I., Matsuoka M. and Yamazaki D. (2018) - Global terrain classification using 280 m DEMs: segmentation, clustering, and reclassification. Earth and Planetary Science (2018) 5:1 DOI 10.1186/s40645-017- 0157-2. Michelini A, Faenza L, Lauciani V, Malagnini L. (2008) - Shakemap implementation in Italy. Seismol Res Lett; 79:688–97. https://doi.org/10.1785/gssrl.79.5.688. Pantaloni M., Bonomo R., Capotorti F., Compagnoni B., D’Ambrogi C., Di Stefano R., Galluzzo F., Graziano R., Martarelli L., Pampaloni M.L., Ricci V.(2006) - La nuova Carta Geologica d’Italia alla scala 1:500.000. Memorie descrittive Carta geologica d’Italia. 01. 113-114. Michelini A, Faenza L, Lauciani V, Malagnini L. (2008) - Shakemap implementation in Italy. Seismol Res Lett; 79:688–97. https://doi.org/10.1785/gssrl.79.5.688. Pitilakis K., Riga E., Anastasiadis A., Fotopoulou S., Karafagka S. (2018) - Towards the revision of EC8: Proposal for an alternative site classification scheme and associated intensity dependent spectral amplification factors. Soil Dynamics and Earthquake Engineering. https://doi.org/10.1016/j.soildyn.2018.03.030 StandardMS versione 4.1, disponibili presso https://www.centromicrozonazionesismica.it/it/download/category/26- standardms-41. ESTIMATION OF THE SPECTRAL ACCELERATION OF A HISTORIC MASONRY BUILDING BY USING DIFFERENT APPROACHES R.S. Olivito, S. Porzio Department of Civil Engineering, University of Calabria, Rende (CS), Italy Introduction. The mitigation of seismic vulnerability is an excellent interest task for researchers, especially in seismic prone areas such as southern Italy (Olivito et al. , 2018, Olivito et al. , 2019). Structures that characterize old cities have several uncertainties affecting the geometrical and mechanical features. They are the result of many modifications that happened throughout the centuries. In order to take into account these complexities, different devices, and numerical methodologies have been successfully utilized as a support for the seismic investigation. For these reasons, this study concerns the seismic assessment of a historic masonry building by using both nonlinear static and dynamic analyses. The case study is the San Fili Castle of Stignano (province of Reggio Calabria, south of Italy), a fortified residential building built in the XVIII century all in rubble masonry (Olivito and Porzio, 2019). This artifact was taking into account owing to its particular geometrical configuration. A Finite Element (FE) model was developed with ABAQUS software by meshing the 3D geometric model provided by the Digital Photogrammetry. Moreover, the Concrete Damage Plasticity (CDP) model, available in the computer program, was adopted to describe the nonlinear behavior of masonry. Preliminary sensitivity analyses were carried out to calibrate the dimensions of the mesh and test the effect of some simplifications on the geometry. The spectral acceleration values obtained with FE Method (FEM) approaches were compared with the ones provided by the limit analysis according to the kinematic method. In particular, this simplified analysis was used to investigate two of the most relevant out-of-plane failure mechanisms, highlighted by the global nonlinear analyses. The results of the nonlinear static analysis were presented in terms of pushover curves related to different control points at the top level, as the center of mass of this level and three vertexes of the prismatic volume of the building, which has a triangular plan. For these points, displacement time-histories derived from the dynamic analysis were also presented together with the time history of the base shear in order to compare these results with those provided by the pushover analysis.