Seismic response of Ohba bridge, Fujisawa, Japan: Theory vs. field measurements

G. Mylonakis*, C. Syngros

*Corresponding author for this work

Research output: Contribution to conferenceConference Paperpeer-review

Abstract

The objective of this paper is to investigate the seismic response of an actual bridge pier founded on a group of 64 steel piles in extremely soft clay (N SPT=0), which has been thoroughly instrumented by the Institute of Technology of Shimizu Corporation. Several earthquake motions have been recorded, with peak accelerations in the free field as high as 0.11g. An attempt is presented herein to reproduce the field measurements using analytical tools. The relatively low levels of peak shear strain in the soil (γ < 10 -4) and the high plasticity index of the clay justifies the use of linear elastodynamic methods. The effects of soil amplification, kinematic interaction, foundation compliance, and superstructure inertia on seismic response are considered. Group effects are treated using the superposition method in conjunction with wave-propagation-based interaction factors between piles. It is shown that records and predictions compare reasonably well for the response of the pile cap and bridge deck. Implications of valley effects, multiple-support excitation and structural connections on seismic response are discussed. The study complements and extends earlier studies by Tazoh et al (1984, 1989) and Gazetas et al (1993).

Original languageEnglish
Pages969-980
Number of pages12
Publication statusPublished - 15 Nov 2005
Event2005 Structures Congress and the 2005 Forensic Engineering Symposium - Metropolis and Beyond - New York, NY, United States
Duration: 20 Apr 200524 Apr 2005

Conference

Conference2005 Structures Congress and the 2005 Forensic Engineering Symposium - Metropolis and Beyond
Country/TerritoryUnited States
CityNew York, NY
Period20/04/0524/04/05

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