Over Twenty Years Seismic Monitoring Experience of a Cable-Stayed Bridge: Lessons Learned on Structural Assessments

Abstract eng:
Instrumentation of many bridges in Japan, especially the long-span cable-supported ones play an important role in seismic performance evaluation. Since Japan is located on seismically active area, these permanent instrumentations provide high quality seismic records every time an earthquake occurs that allow us to investigate seismic performance of the structure. In this study, seismic monitoring experience and the related research on the Yokohama-Bay Bridge, a cable-stayed bridge in Yokohama, Japan is presented. The bridge with central span of 460 m and two side spans of 200 m each is densely instrumented with 85 arrays of accelerometers. Seismic responses from more than a hundred earthquakes have been recorded since 1990 until 2011 including major events such as the 2004 Chuetsu-Niigata Earthquake and the 2011 Great East-Japan Earthquake, notably the largest earthquake ever recorded on the bridge. The paper describes lessons learned from over twenty years experience on monitoring especially on the structural assessment based on analysis of monitoring data. The monitoring results have been used to evaluate structural performance especially the link-bearing connection—a seismic isolation device on different level of earthquake, the effect of structural modification and seismic retrofit on the characteristics of seismic response, and detecting the occurrence of unexpected events such as longitudinal slip-slip behavior of link- bearing connection, lateral pounding between tower and girder during large earthquake, and vehicle overturning incident.

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