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MULTI-HAZARD RISK ASSESSMENT ON ROAD INFRASTRUCTURES—A framework for assessing the earthquake- and rain-induced landslide resilience of a road network in Turin, Italy, with multiple RC bridges and a tunnel

Areeb Ahmed Shariff

MULTI-HAZARD RISK ASSESSMENT ON ROAD INFRASTRUCTURES—A framework for assessing the earthquake- and rain-induced landslide resilience of a road network in Turin, Italy, with multiple RC bridges and a tunnel.

Rel. Marco Civera, Fabrizio Aloschi, Andrea Miano. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Civile, 2025

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Abstract:

In an era where unpredictable and extreme weather events are becoming increasingly frequent, it is essential to have infrastructure that is resilient and can remain functional during and after a natural hazard event. A nation's or a region’s economy heavily relies on the smooth operation of its road network. However, road infrastructure is always vulnerable to natural hazards that can lead to anything from small disruptions to road closures for several months as well. This master's thesis focuses specifically on calculating the efficiency index of the road network under multi-hazard conditions in the region of Piemonte, Italy. To evaluate the efficiency index, we must evaluate the geotechnical stability of the slope and analyze the structural stability of building bridges along the RN. For this thesis, the road can be disturbed by three factors: the first is the EQIL (earthquake-induced landslide). For this, we must do a detailed study involving the modeling of the slopes in the study area using QGIS and DEM data. Various geotechnical parameters, such as effective friction angles, cohesion, and soil volumetric mass, were assigned to the registered landslides. To estimate stability, factors of safety (FS) were calculated for both dry and fully saturated conditions, followed by the determination of critical acceleration (ac). Together with the modelling, seismic data from the INGV database were used to determine the peak ground acceleration (PGA) for calculating Newmark displacement. Two scenarios were considered: dry conditions and fully saturated conditions. The results of the stability analysis showed that slopes with an FS value less than one are inherently unstable and likely to fail without external triggers. Under fully saturated conditions, the probability of failure increased significantly. The Newmark displacement analysis provided insight into additional earthquake risks, improving the ability to effectively predict and mitigate landslides. Finally, the results of the Newmark displacement calculations for each landslide along the four roads were presented in Appendix B. Slopes with FS values below one, and thus negative ac values, were still shown in red and will not show displacement according to the calculations. However, displacement will occur before an earthquake trigger occurs, exacerbating the situation. Some landslides were marked in yellow, meaning they have a calculated DN value and are sensitive to seismic activity. Now, for the second hazard, we must study how damage caused to buildings and bridges due to a seismic event impacts the overall efficiency of the road network. For this, we first had to get the data of all the buildings and bridges along the road network. And then calculate the PGAcap concerning the damage state. This study is important for making roads and infrastructure safer by looking closely at how landslides happen and using tools to assess the risks. The determination of the critical acceleration provides the opportunity for further analysis, such as determining road efficiency using an efficiency index. Lastly, we tried to calculate the economic impact of road disruptions on the surrounding communities and businesses.

Relatori: Marco Civera, Fabrizio Aloschi, Andrea Miano
Anno accademico: 2024/25
Tipo di pubblicazione: Elettronica
Numero di pagine: 67
Soggetti:
Corso di laurea: Corso di laurea magistrale in Ingegneria Civile
Classe di laurea: Nuovo ordinamento > Laurea magistrale > LM-23 - INGEGNERIA CIVILE
Aziende collaboratrici: NON SPECIFICATO
URI: http://webthesis.biblio.polito.it/id/eprint/35899
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