scholarly journals Pushover-Based Seismic Capacity Evaluation of Uto City Hall Damaged by the 2016 Kumamoto Earthquake

Buildings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 140 ◽  
Author(s):  
Kenji Fujii
Keyword(s):  
Pushover Analysis ◽  
Nonlinear Behavior ◽  
Equivalent Linearization ◽  
2016 Kumamoto Earthquake ◽  
Seismic Capacity ◽  
Limit Values ◽  
Kumamoto Earthquake ◽  
City Hall ◽  
The 2016 Kumamoto Earthquake ◽  
Capacity Index

The seismic capacity of the main Uto City Hall building, which was severely damaged by the 2016 Kumamoto Earthquake, was evaluated by the proposed pushover-based procedure. In this procedure, the seismic capacity index of the building is defined as the maximum scaling factor of the seismic input, for which the local responses do not exceed their limit values. From the pushover analysis result, the displacement limit of the equivalent single-degree-of-freedom model was determined. Then, the seismic capacity index was evaluated using an equivalent linearization technique. The evaluated index was re-evaluated by considering the bidirectional excitation. The pushover analysis result revealed that the torsional response is significant in the nonlinear behavior of this building. The evaluated seismic capacity implied that some structural damages, including the yielding of the beam-column joint, may have occurred during the first earthquake on 14 April 2016.

scholarly journals Correction: Fujii, K. Pushover-Based Seismic Capacity Evaluation of Uto City Hall Damaged by the 2016 Kumamoto Earthquake. Buildings 2019, 9, 140

Buildings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 234
Author(s):  
Kenji Fujii
Keyword(s):  
Nonlinear Analysis ◽  
Analysis Program ◽  
2016 Kumamoto Earthquake ◽  
Seismic Capacity ◽  
Kumamoto Earthquake ◽  
City Hall ◽  
Capacity Evaluation ◽  
The 2016 Kumamoto Earthquake

It is very unfortunate that there are some errors in the nonlinear analysis program used for this published article [...]

scholarly journals Application of Mode-Adaptive Bidirectional Pushover Analysis to an Irregular Reinforced Concrete Building Retrofitted via Base Isolation

2021 ◽  
Vol 11 (21) ◽  
pp. 9829
Author(s):  
Kenji Fujii ◽  
Takumi Masuda
Keyword(s):  
Reinforced Concrete ◽  
Base Isolation ◽  
Pushover Analysis ◽  
Half Cycle ◽  
2016 Kumamoto Earthquake ◽  
Isolation Technique ◽  
Reinforced Concrete Building ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake ◽  
Concrete Building

In this article, the applicability of mode-adaptive bidirectional pushover analysis (MABPA) to base-isolated irregular buildings was evaluated. The point of the updated MABPA is that the peaks of the first and second modal responses are predicted considering the energy balance during a half cycle of the structural response. In the numerical examples, the main building of the former Uto City Hall, which was severely damaged in the 2016 Kumamoto earthquake, was investigated as a case study for the retrofitting of an irregular reinforced concrete building using the base-isolation technique. The comparisons between the predicted peak response by MABPA and nonlinear time-history analysis results showed that the peak relative displacement can be properly predicted by MABPA. The results also showed that the performance of the retrofitted building models was satisfactory for the ground motion considered in this study, including the recorded motions in the 2016 Kumamoto earthquake.

scholarly journals Application of Mode-Adaptive Bidirectional Pushover Analysis to an Irregular Reinforced Concrete Building Retrofitted via Base Isolation

2021 ◽  
Author(s):  
Kenji Fujii ◽  
Takumi Masuda
Keyword(s):  
Reinforced Concrete ◽  
Base Isolation ◽  
Pushover Analysis ◽  
Half Cycle ◽  
2016 Kumamoto Earthquake ◽  
Isolation Technique ◽  
Reinforced Concrete Building ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake ◽  
Concrete Building

In this article, the main building of the former Uto City Hall, which was severely damaged in the 2016 Kumamoto earthquake, is investigated as a case study for the retrofitting of an irregular Reinforced Concrete building using the base-isolation technique. Its peak response is predicted via mode-adaptive bidirectional pushover analysis (MABPA), which was originally proposed by the authors. In the prediction step of MABPA, the peaks of the first and second modal responses are predicted considering the energy balance during a half cycle of the structural response. The numerical analysis results show that the peak relative displacement can be properly predicted by MABPA. The results also show that the performance of the retrofitted building models is satisfactory for the ground motion considered in this study, including the recorded motions in the 2016 Kumamoto earthquake.

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