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<p>During last 5 years, the Ministry of Public Works and the Pontificia Universidad Católica de Valparaíso are developing a Risk Management System applied in several road infrastructures called GRDR. This methodology is focus on the inspection on: 1. Structures in order to identify the vulnerability; 2. environmental conditions with the aim to identify the exposure and hazard. The relations between these indexes use an algorithm to apply the weight on the parameters. Currently, the deterministics inspection use a comprehensive management program provides an index of vulnerability (Performance indicators) in structures as bridges and pavements. But it is not included the hazard or exposure index. This paper delivers the first index of hazards and exposure related with seismic, flooding and fire threat applied on the Risk Management System (GRDR), with an implementation on two main Chilean structures, namely: La Pólvora Tunnel T3, a medium long span structure, located at the Region Valparaiso, in the maritime and urban area exposed in the last years an earthquakes and fire hazards, and Subway Line 3, located in Santiago, the new station in service during 2018 with a high users and hazard by earthquake and flooding.</p>

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<p>After the extreme weather events of 2015 and 2017 in the north of Chile involving heavy rain and debris flood, the Ministry of Public Works launched a Risk assessment program on road infrastructure in order to reduce the risk and provide a list of structures in the national network that could be affected by natural hazards. From 2015 to 2019, GRDR methodology was proposed considering the identification of the damage index (vulnerability) and the frequent natural and made-man hazard (debris flood, flood, fire, among other) applied on tunnels, bridges and other road structures. The GRDR was applied as complement of the current inspections and studies of probabilistic method to identify the hazards. From 2019 a collaboration between MOP and Pontificia Universidad Católica de Valparaíso updated the GRDR methodology including automatization of the acquisition data, review of the algorithm of weight and the study of specific natural hazards. Within this framework, it was determined that the Valparaíso Region of Chile would be the pilot plan in order to apply and calibrate the updated GRDR. This paper presents the results of the application and calibration of the GRDR on two critical roads of Valparaíso Region. An analysis of the inspection using UAV, Thermal camera, GRDR platform among other is carried out. The results of the methodology implemented on Las Palmas Tunnel, Pudehue Bridge (Road Bridge converted from railway structure) and structures in Quebrada Alvarado (gorges) are presented. Also, final comments to improve the GRDR are carried out.</p>

<p>During the last five years, the north of Chile was impacted by several natural disasters not considered in the traditional code design. During 2015 a great rain fall occurred in a desert zone, it is not prepared by this amount of water, producing soil and debris currents from the mountain to the sea (about 100 km).</p><p>These phenomena produced an important damage in the infrastructure, specially focused on roads and bridges. The main damage detected was the collapse of the infrastructure (piers and abutment) and the unlinking between deck and piers.</p><p>This paper presents a proposal methodology to assess the effect of these currents on bridges, using the case of study of the Chañaral Bridge, a multi-supported bridge, with four concrete girders, slab girder and two spans of 20 meters supported in two abutments and one concrete pier, over the Charañal River.</p><p>A sensitive hydraulic analysis via FEM was carried out using non-Newtonian flows (high density) representing the real final topography-condition of the current. A FEM of the bridge was carried out too considering a Non- Linear transient load. The inputs for model are the outputs from the hydraulic model in order to define the condition that produce the same collapse behavior showed after the real debris current.</p><p>Finally, results of this methodology are discussed, providing a comprehensive methodology, step by step, in order to obtained similar results according to the 2015 event.</p>