Earthquake response prediction of seismically isolated buildings based on response spectrum method considering changes in characteristics of lead rubber bearings due to repeated deformations, part 2: Improvement of prediction accuracy by equivalent damping factor calculation method using effective ductility factor

The response spectrum method (RSM), specified by the Ministry of Construction notification Vol. 2009, is not part of the countermeasure to address the Nankai trough long‐period and long‐duration ground motions (LPGMs) announced in 2016. Consequently, in this study, an approach was proposed to assess...

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Bibliographic Details
Published in:Japan architectural review 2024-01, Vol.7 (1), p.n/a
Main Authors: Kobayashi, Masahito, Zhu, Zeyu, Senda, Yuto
Format: Article
Language:English
Subjects:
Accuracy
Buildings
Damping
Deformation effects
Ductility
Ductility tests
Earthquake dampers
Earthquake prediction
Earthquakes
effective ductility factor
lead rubber bearing
long‐period and long‐duration ground motions
Nonlinear response
repeated deformations
response spectrum method
Rubber
Seismic isolation
Seismic response
Shear strain
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Summary:The response spectrum method (RSM), specified by the Ministry of Construction notification Vol. 2009, is not part of the countermeasure to address the Nankai trough long‐period and long‐duration ground motions (LPGMs) announced in 2016. Consequently, in this study, an approach was proposed to assess the effect of changes in characteristics due to repeated deformations using the RSM for LPGMs and seismically isolated buildings using lead rubber bearings (LRBs). However, this study identified potential areas for improvement in the calculation of effective damping using the RSM. An effective damping calculation method of the RSM using an effective ductility factor is introduced to enhance the accuracy of the proposed method. The proposed RSM‐based method was verified against the methods based on nonlinear time history analysis. The earthquake response prediction results using the proposed method were compared with those of not only the simplified method but also the precise and the quasi‐precise methods. The accuracy of earthquake response prediction using the proposed approach is increased by 30%–50% when the effective ductility factor is used to compute the effective damping. Therefore, earthquake response can be predicted using the proposed method, and the accuracy achieved is similar to the nonlinear time history analysis. This figure illustrates the process of the proposed method. The steps in bold frames denote the processes added to the conventional response spectrum method and conform with the simplified method. First, the response calculation without considering the influences of repeated deformations is performed to assess the total absorbed energy of the LRB. Next, according to the design equation, the strength of the LRB decreases, and the response calculation is repeated. In this study, we improved the prediction accuracy of the proposed method by refining the approach to determine the equivalent damping factor that uses the effective ductility factor multiplied by a correction factor. Consequently, earthquake response can be predicted using the proposed method, and the accuracy achieved is similar to the nonlinear time history analysis.
ISSN:2475-8876
2475-8876
DOI:10.1002/2475-8876.12452