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Yukihide Kajita Last modified date：2024.04.18

Associate Professor / Structural Analysis and Earthquake Engineering
Faculty of Engineering


Graduate School
Graduate School of Engineering
Department of Civil and Structural Engineering
Graduate School of Engineering
Undergraduate School
School of Engineering
Department of Earth Resources,Marine and Civil Engineering
School of Engineering
Other Organization
Disaster Risk Reduction Research Center


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Homepage
https://kyushu-u.elsevierpure.com/en/persons/yukihide-kajita
　Reseacher Profiling Tool　Kyushu University Pure
https://eq-eng.wixsite.com/laboratory?lang=en
Phone
092-802-3377
Fax
092-802-3377
Academic Degree
Dr. (Eng.)
Country of degree conferring institution (Overseas)
No
Field of Specialization
Structural Engineering, Earthquake Engineering
Total Priod of education and research career in the foreign country
01years00months
Outline Activities
Research: I have conducted both the experiment and the analysis to evaluate the seismic performance of the highway bridges. Particularly, I focus on the collision between the superstructure and the abutment and the seismic safety of the damaged bridges.

Education: I have the chair of dynamic mechanics and vibration control.

Social activities: I join the JSCE (Japan Society of Civil Engineers) , the JAEE（Japan Association for Earthquake Engineering） and so on.
Research
Research Interests
  • Seismic response analysis of bridges considering the interaction between structures and ground
    keyword : liquification, abutment
    2018.04.
  • Study on the applicability of dilatant fluid to shock absorbers for bridges
    keyword : dilatant fluid, shock absorbing material
    2018.04.
  • Examination of seismic safety of precast box culvert
    keyword : box culvert. seismic safety
    2018.04.
  • Examination of estimation method of earthquake safety of bridges with a bridge age of 50 years or more
    keyword : old bridges, restoration design
    2019.04.
Academic Activities
Reports
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Papers
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1. Kunyang Wang, Yukihide Kajita and Yaoxin Yang, Bayesian RC-Frame Finite Element Model Updating and Damage Estimation Using Nested Sampling with Nonlinear Time History, Buildings, https://doi.org/10.3390/buildings13051281, 13, 5, 1281, 2023.05, This paper proposes a Bayesian RC-frame finite element model updating (FEMU) and damage state estimation approach using the nonlinear acceleration time history based on nested sampling. Numerical RC-frame finite element model (FEM) parameters are selected through nested sampling, and their probability density is estimated using nonlinear time history. In the first step, we estimate the error standard deviation and select the FEM parameters that are required to be updated by FEMU. In the second step, we estimate the probability density of the selected parameters and realize the FEMU through the resampling method and kernel density estimation (KDE). Additionally, we propose a damage state estimate approach, which is a derivative method of the FEMU sample. The numerical results demonstrate that the proposed approach is reliable for the Bayesian FEMU and damage state estimation using nonlinear time history..
2. Mujtaba Amin, Yukihide Kajita, Taiji Mazda, Numerical Simulation of Pounding Effect on Damage Assessment of an Abutment for Highway Bridge, Proceedings of the 7th Asia Conference on Earthquake Engineering, Paper ID 0009, 2018.11, The current study mainly focuses on the impact damage assessment of the abutments considering the non-linearity of backfill soil which has not ever quantitatively estimated. The numerical simulation of pounding effect on four types of the abutments with wing wall variation in shapes and dimensions were carried out using the explicit FE code LS-DYNA. The pounding scenario was simulated by the initial impact velocity on the entire nodes of the superstructure. The numerical models are capable of simulating the nonlinearly of backfill soil, damage of concrete and yielding of reinforcement steel with strain rate effect behavior of concrete and steel reinforcement. The study indicates that the response displacement and the impact force on the back wall are affected by the non-linear backfill soil and wing wall variations. At the initial instant of impact, there is No significant effect on the impact forces whereas, for the rest of the time, the impact force on the back wall slightly decreased and the abutment displacement at the crown of back wall increased due to soil non-linearity. In the case of low impact velocity, damage only occurs at the base of the back wall whereas, in the case of maximum velocity impact, the damage spread over the entire Back wall and damage to the entire abutment was confirmed. In the design, only one impact is considered. However, in a real situation, a few or several impacts would occur during an earthquake. So, if the damage to abutment is predicted precisely, the non-linear property of backfill soil should be considered..
3. Yukihide Kajita, A Horizontal Loading Test and Its Simulation Analysis of the Abutment Model with Backfill Soil
, Proc. of the 2014 Taiwan-Japan Workshop on Structural and Bridge Engineering, 2014.05.
4. Yukihide Kajita, Hisanori OTSUKA, Yuki Fujiyoshi, A Horizontal Test and Its Simulation Analysis of the Abutment Model with Backfill Soil
, Proc. of the 15th World Conference on Earthquake Engineering, Paper No.0339(CD-ROM), 2012.09.
Presentations
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1. Yukihide Kajita, 小林　智宏, Hisanori OTSUKA, Investigation on the risk of traffic passage by the damage of girder and abutment due to severe earthquakes, International Conference of Safety, Reliability, Risk and Life-Cycle Performance of Structures and Ingrastructures, 2013.06.
Membership in Academic Society
  • Kyushu Association for Bridge and Structural Engineering
  • Kyushu Society for Engineering Education
  • The Japanese Geotechnical Society
  • Japan Society of Civil Engineers
  • Japan Concrete Institute
  • Japanese Society of Steel Construction
  • Japan Association for Earthquake Engineering
Educational
Educational Activities
Mechanics (Rigid Body and Elastic-Plastic Material), Structural Analysis (Frame Model, Finite Element Model), Dynamics (Mass system)
Social
Professional and Outreach Activities
None.


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