Yamashita, Tetsuo

Damage Prediction and Retrofit Plan Using Dampers for a High-Rise Steel Building in Tokyo Based on Its Response Records

Abstract eng:
The Great Tohoku-oki earthquake of March 11, 2011 (the ‘311’ earthquake) showed that the intensity of ground shaking for some site location has been as large or larger than the maximum levels (450 years reoccurrence period) considered in the current design of typical structures in Japan. In addition, the ground motion in the Tokyo Metropolitan showed extremely long durations (around 10 min.). Structural engineers and researchers have consequently recognized that the structural performance should be improved to match the potential of more intensive shaking with long durations in the future. Seismologists expected that the Tokyo metropolitan area will experience as large as three to four times the shaking of the 311 earthquake in near future, such as M7-class earthquakes under the City of Tokyo (the ‘Shuto-Chokka’ earthquake) and/or a M8/M9-class earthquake along the Nankai-trough (the ‘Nankai-Trough’ eathquake). In such cases, high-rise buildings, particularly those without protective systems, are supposed to suffer significant structural damage. Accordingly, the comprehensive seismic performance reevaluation and corresponding retrofitting on existing high-rise buildings have become the most critical issues in current structural engineering in Japan. In this study, a 29-story steel building is analyzed, which is a university campus building, and experienced great shaking during the 311 earthquake. The building structure is a conventional moment resisting frame, and characterized by long-span with many braces of non-ductile performance. First, a detailed member-to-member frame model of the building is constructed, and the validity of the model is checked by comparing the simulated results with the observed records of the 311 earthquake. Next, the nonlinear structural analysis is conducted and its structural damage is estimated using large input ground motions for the hypothetical Shuto-Chokka and Nanka-Trough earthquakes. Finally, a new retrofit design methodology to optimally determine the location of dampers will be presented, and the effect and efficiency is confirmed.

Contributors:

Nakanishi, Mako

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

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