Kyushu University Academic Staff Educational and Research Activities Database
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Yukihide Kajita Last modified date:2020.06.27

Associate Professor / Structural Analysis and Earthquake Engineering
Faculty of Engineering

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Academic Degree
Dr. (Eng.)
Country of degree conferring institution (Overseas)
Field of Specialization
Structural Engineering, Earthquake Engineering
Total Priod of education and research career in the foreign country
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 Interests
  • Seismic response analysis for underground pipe in soft ground considering irregularity of base surface
    keyword : liquification, underground pipe
  • Estimation of slump of the bridge abutment due to soil liquification
    keyword : liquification, abutment
  • Estimation of the risk of trafficability for highway bridges using the ground excitation records
    keyword : ground excitation records, trafficability, earthquake
  • Seismic evaluation for the bridges subjected to a long duration seismic excitation
    keyword : seismic excitation, long duration
  • Resistance characteristic of abutment with consideration of back fill soil
    keyword : abutment, back fill soil
  • Seismic evaluation for the steel truss bridges considering with the corrosion and the deterioration
    keyword : Steel truss bridge, Redundancy, Deterioration
  • Determination method of partial safety factors for the buckling design of the steel piers
    keyword : partial safety factors, steel pier, local buckling
  • A proposal on the desing method of the shock absorbing rubber
    keyword : Shock absorbing rubber, the collision between the girders
Academic Activities
1. 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..
2. 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.
3. 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.
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 Activities
Mechanics (Rigid Body and Elastic-Plastic Material), Structural Analysis (Frame Model, Finite Element Model), Dynamics (Mass system)
Professional and Outreach Activities