Comparative Study of Non-Isolated and Isolated Bridge with TCFP Bearing Under Spatially Varying Ground Motions

Year 2017, Volume: 3 Issue: 2, 29 - 32, 01.11.2017

Muhammet Yurdakul

Abstract

In this study,
stochastic behaviours of non-isolated and isolated highway bridges under
spatially varying ground motion are examined. The triple concave friction
pendulum (TCFP) bearing is used as a seismic isolation system which is easy to
be manufactured and stand out against severe earthquake more than traditional
seismic isolation systems. The spatially varying earthquake ground motion model
includes wave-passage, incoherence and site-response effects. The incoherence
effect is examined by considering the Harichandran and Vanmarcke coherency
model. Soft and firm soil types are selected for considering the site-response
effect where the bridge supports are constructed. The mean of maximum element
forces and displacements of deck are examined in the study. Results from
stochastic analysis of isolated and non-isolated bridges subjected to spatially
varying ground motion are compared with each other for the special cases of the
ground motion model. It is observed from stochastic analysis that the TCFP
bearing decreases element forces of bridge deck by 61% to 93%. Also, it is
pointed out that increasing of difference between the soils types at support
points generally increase element forces and displacements.

Keywords

Seismic isolation system, Triple concave friction

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