EFFECTIVENESS OF WAVE PASSAGE EFFECT OF SEISMIC ISOLATED AND NONISOLATED BRIDGES UNDER SPATIALLY VARYING GROUND MOTION

Year 2018, Volume: 13 Issue: 3, 201 - 216, 23.07.2018

Muhammet Yurdakul , Şevket Ateş

Abstract

In this
study, stochastic analyses of isolated and nonisolated highway bridges under
spatially varying ground motion are performed. The bridge is isolated with
triple concave friction pendulum (TCFP) bearing. The selected bridge is assumed
to be constructed on homogeneous soft soil. Incoherency effects are neglected
and wave passage effect is taken into account in the stochastic analyses. The
bridge model subjected to spatially varying earthquake ground motions in the
horizontal direction. The horizontal input is assumed to travel across the
bridge from left to right side with finite velocities of 100m/s, 200m/s and 400m/s.
The means of the maximum responses of displacement and internal forces of
bridge deck are investigated. The results of these stochastic analyses are also
compared with the results of infinite velocity. Analysis results show that
using TCFP bearing on Highway Bridge reduces means of maximum values of total
axial force, shear force and bending moment of bridge deck by 89%, 86% and 96%,
respectively. In generally, low speed is more effective than high speed at the
means of the maximum responses of internal forces of bridge deck. The finite
velocity is the most effective at means of the maximum responses of horizontal
displacement of bridge deck. 

Keywords

Stochastic Analysis, Seismic Isolation, Sliding Isolation System, Triple Friction Pendulum Bearing, Wave Passage Effect

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