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Response analysis of the Higashi-Kobe Bridge and surrounding soil in the 1995 Hyogoken-Nanbu Earthquake

✍ Scribed by Ganev, Todor; Yamazaki, Fumio; Ishizaki, Hiroshi; Kitazawa, Masahiko

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 434 KB
Volume: 27
Category: Article
ISSN: 0098-8847
DOI: 10.1002/(sici)1096-9845(199806)27:6<557::aid-eqe742>3.0.co;2-z

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✦ Synopsis

This paper presents results of observation and analysis of the response of one of the longest cable-stayed bridges in the world to the Hyogoken-Nanbu (Kobe) Earthquake of 17 January 1995. It is determined that interaction of the foundations of the bridge towers with the supporting soil plays a decisive role in the overall structural behaviour. The key factor governing the changes of the soil properties at this site is pore-water pressure buildup, which results in liquefaction of the saturated surface soil layers under large dynamic loads. Models of the soil and structure are created and initially validated by accurately simulating the system response to a small earthquake. Soil parameters reflecting the pore-water pressure buildup in the strong earthquake are determined by an advanced non-linear effective stress analysis, combining the Ramberg-Osgood model of stress-strain dependence with a pore pressure model based on shear work concept. They are utilized to investigate and simulate the interaction of the foundation and the supporting soil using the program SASSI with the flexible volume substructuring approach. The results show a good agreement with the observations and have useful implications to the scientific and engineering practice.

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