Earthquakes and Structures

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Influence of some relevant parameters in the seismic vulnerability of RC bridges

  • Olmos, B.A. (Facultad de Ingenieria Civil, Universidad Michoacana de San Nicolas de Hidalgo) ;
  • Jara, J.M. (Facultad de Ingenieria Civil, Universidad Michoacana de San Nicolas de Hidalgo) ;
  • Jara, M. (Facultad de Ingenieria Civil, Universidad Michoacana de San Nicolas de Hidalgo)
  • Received : 2011.06.19
  • Accepted : 2012.04.10
  • Published : 2012.06.25
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Abstract

Recent earthquakes have damaged some bridges located on the Pacific Coast of Mexico; these bridges have been retrofitted or rebuilt. Based on the fact that the Pacific Coast is a highly active seismic zone where most of the strong earthquakes in the country occur, one fertile and important area of research is the study of the vulnerability of both new and existent bridges located in this area that can be subjected to strong earthquakes. This work is focused on estimating the contribution of some parameters identified to have major influence on the seismic vulnerability of reinforced concrete bridges. Ten models of typical reinforced concrete (RC) bridges, and two existing bridges located close to the Pacific Coast of Mexico are considered. The group of structures selected for the study is based on two span bridges, two pier heights and two substructure types. The bridges were designed according to recent codes in Mexico. For the vulnerability study, the capacity of the structure was evaluated based on the FEMA recommendations. On the other hand, the demand was evaluated using a group of more than one hundred accelerograms recorded close to the subduction zone of Mexico. The results show that the two existent bridges analyzed show similar trends of behavior of the group of bridge models studied. In spite of the contribution that traditional variables (height and substructure type) had to the bridge seismic response, the bridge length was also found to be one of the parameters that most contributed to the seismic vulnerability of these RC medium-length bridges.

Keywords

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