TY - GEN
T1 - Proposal methodology to assess debris current design in traditional Chilean Bridges
AU - Valenzuela, Matías A.
AU - Álvarez, Flavio H.
AU - Hernández, Francisco
AU - Pinto, Hernán
AU - Valenzuela, Nicolás A.
N1 - Publisher Copyright:
© 20th Congress of IABSE, New York City 2019: The Evolving Metropolis - Report. All rights reserved.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2019
Y1 - 2019
N2 - 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). 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. 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. 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 NonLinear 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. 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.
AB - 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). 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. 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. 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 NonLinear 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. 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.
KW - Buoyancy
KW - Debris current
KW - FEM
KW - Multi-supported bridge
KW - Non-Linear transient load
KW - Uplift force
UR - http://www.scopus.com/inward/record.url?scp=85074452635&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85074452635
T3 - 20th Congress of IABSE, New York City 2019: The Evolving Metropolis - Report
SP - 165
EP - 169
BT - 20th Congress of IABSE, New York City 2019
PB - International Association for Bridge and Structural Engineering (IABSE)
T2 - 20th IABSE Congress, New York City 2019: The Evolving Metropolis
Y2 - 4 September 2019 through 6 September 2019
ER -