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Seismic Response of Ohba Bridge, Fujisawa, Japan: Theory vs. Field Measurements
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 (NSPT = 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 and Gazetas et al.
Seismic Response of Ohba Bridge, Fujisawa, Japan: Theory vs. Field Measurements
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 (NSPT = 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 and Gazetas et al.
Seismic Response of Ohba Bridge, Fujisawa, Japan: Theory vs. Field Measurements
Mylonakis, G. (author) / Syngros, C. (author)
Structures Congress 2005 ; 2005 ; New York, New York, United States
Structures Congress 2005 ; 1-12
2005-04-18
Conference paper
Electronic Resource
English
Seismic Response of Ohba Bridge, Fujisawa, Japan: Theory versus Field Measurements
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