Abstract The 525 meters long Infiernillo II bridge crosses the Infiernillo Dam and it is the first isolated bridge built in Mexico. It is located in the Morelia-Lazaro Cardenas highway that connects the central cities of the country to the Pacific Coast. Arch steel trusses compose the superstructure of the five simple supported spans. The substructure consists of reinforced concrete abutments and piers supported on cylinders and piles. The total cylinder-pier subsystem height is in the range of 46 m to 71 m, causing a strong irregularity in the transverse and longitudinal directions. The bridge was subjected to an assembly of real strong motion movements recorded close to the Pacific Coast in Mexico, site where the most severe earthquakes occur in the country. The study started by evaluating the analytical model with environmental vibration measurements previously taken. Based on the similarity of the results, none adjustment was required for the numerical model. The results show the importance of the isolator dynamic characteristics on the expected seismic behavior of the bridge. Special emphasis is dedicated to analyze the effectiveness of the isolation system for avoiding concentration of strength and displacement ductility demands on an irregular bridge substructure.
Use of sliding multirotational devices of an irregular bridge in a zone of high seismicity
KSCE Journal of Civil Engineering ; 17 , 1 ; 122-132
2013-01-01
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Use of sliding multirotational devices of an irregular bridge in a zone of high seismicity
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