Effects of isolation on the seismic response of bridges designed for two different soil types |
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| Authors: | B A Olmos J M Jara J M Roesset |
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| Institution: | (1) Laboratory of Concrete and Masonry Structures, Department of Civil Engineering, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece;(2) Division of Structural Engineering, Department of Civil Engineering, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece |
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| Abstract: | The objective of this study was to investigate the effect of lead rubber isolators on the seismic response of bridges designed
according to current codes for two different soil conditions: hard and medium type soils, in order to assess their applicability
for the design of new bridges or retrofit of existing ones. The study was conducted for two levels of earthquake, one corresponding
to a return period of 50 years and a service limit state, the other with a return period of 1,000 years and a failure limit
state. Twenty one subduction earthquake records on the two types of soil were used to evaluate the linear and nonlinear dynamic
response of a set of bridges designed for this purpose with and without base isolation. The response parameters evaluated
are the maximum relative displacement on top of the piers, the maximum pier distortion, the maximum shear forces in the piers
and the ductility demands for the isolators. The results presented are the average of these maxima for the various earthquakes.
This study is an expansion of a previous one in which the seismic response of 36 bridges considering models with and without
base isolators, structures with linear base isolators and bridges with nonlinear isolators. The results of this study confirm
the conclusions previously obtained and show that the isolation can have beneficial effects even for bridges located in medium
soil types. |
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