HIRAO Kensho

Affiliation

Faculty of Urban Innovation, Division of Urban Innovation

Job Title

Assistant Professor

Research Fields, Keywords

Structural engineering, Non Destructive Inspection, Machine learning, Data science, High-strength bolted friction joints

Web Site

http://www.cvg.ynu.ac.jp/G1/Eng/index

Related SDGs




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Education 【 display / non-display 】

  • 　
    -
    2022.9

    Tokyo Institute of Technology   Doctor Course   Completed

  • 2017.4
    -
    2019.3

    Tokyo Institute of Technology   Master Course   Completed

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Degree 【 display / non-display 】

  • Doctor of Engineering - Tokyo Institute of Technology

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Campus Career 【 display / non-display 】

  • 2022.10
    　
    　

    Duty   Yokohama National UniversityFaculty of Urban Innovation   Division of Urban Innovation   Assistant Professor  

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Academic Society Affiliations 【 display / non-display 】

  • 2017
    　
    　
     

    Japan Society of Civil Engineers

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Research Areas 【 display / non-display 】

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Structural and seismic engineering

  • Others / Other  / Steel structure

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Qualification acquired 【 display / non-display 】

  • First Kind of High School Teacher License

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Thesis for a degree 【 display / non-display 】

  • Quantification of Uncertain Influential Parameters Affecting the Structural Performance Evaluation of High Strength Bolted Friction Joints

    Kensho HIRAO

    2022.9

    Doctoral Thesis   Single Work    [Reviewed]

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Papers 【 display / non-display 】

  • Experimental Study on the Rotational Loosening Mechanism of High-Strength Bolts under Service

    Kensho HIRAO, Hiroshi TAMURA

    IABSE Symposium 2025   1 ( 118 )   2025.5  [Reviewed]

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IABSE   Joint Work  

    Other Link： https://virtual.oxfordabstracts.com/event/5176/submission/118

  • FUNDAMENTAL STUDY ON STRESS EVALUATION OF STEEL MEMBERS USING LEEB HARDNESS

    Hikaru FUJITA, Hiroshi TAMURA, Kensho HIRAO

    Proceedings of Constructional Steel   33   863 - 876   2025.11  [Reviewed]

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    Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Steel Construction   Joint Work  

  • STUDY ON IMPROVING SLIP COEFFICIENT OF HIGH -STRENGTH BOLTED FRICTION JOINTS WITH FRICTION SIMS

    Ryoto, YAMANISHI, Kensho HIRAO, Hiroshi TAMURA

    Proceedings of Constructional Steel   33   256 - 268   2025.11  [Reviewed]

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Steel Construction   Joint Work  

  • MEASUREMENT OF STRAIN DISTRIBUTION ON CFRP-BONDED STEEL UNDER TENSILE LOADING AND CONSIDERATION OF DEBONDING INITIATION CONDITIONS

    Rintaro DOBASHI, Hiroshi TAMURA, Kensho HIRAO, Taiji YAMATO

    Proceedings of Constructional Steel   33   140 - 152   2025.11  [Reviewed]

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Steel Construction   Joint Work  

  • Improvement of Positioning Accuracy of Augmented Reality Bridge Inspection Support System

    Ryudo KASHIMA, Kensho HIRAO, Hiroshi TAMURA

    IABSE Symposium 2025   1 ( 57 )   2025.5  [Reviewed]

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IABSE   Joint Work  

    Other Link： https://virtual.oxfordabstracts.com/event/5176/submission/57

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Review Papers 【 display / non-display 】

  • クロスリアリティ(XR)を用いた定量的リアルタイム損傷検出手法の提案 -アメリカ・カナダの研究-

    平尾 賢生，今村 光希，大庭 大，ガンフー フレルバートル，桐本 翔平，島野 孝則，中島 大樹，濱野 北斗，舟橋 景介，山科 盛人

    橋梁と基礎   59 ( 9 )   53 - 55   2025.9

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    Authorship：Lead author   Language：Japanese   Publishing type：Book review, literature introduction, etc.   Publisher：株式会社建設図書   Joint Work  

  • 台湾における橋梁現場視察報告(淡江大橋と中正橋)

    下村匠，佐々木栄一，平尾賢生

    橋梁と基礎   59 ( 2 )   45 - 48   2025.2

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher：株式会社建設図書   Joint Work  

  • Detecting bolts loosening due to nut rotational history using AI image processing

    Kensho HIRAO

    J-BEC Report   20   24 - 30   2024.11  [Reviewed]  [Invited]

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    Authorship：Lead author   Language：Japanese   Publishing type：Internal/External technical report, pre-print, etc.   Publisher：Japan Bridge Engineering Center   Single Work  

  • 近接構造物が多い条件下の鋼製鉄道橋の設計・施工

    大庭 大，平尾 賢生，今村 光希，ガンフー フレルバートル，桐本 翔平，郡司 優太，島野 孝則，中島 大樹，濱野 北斗，山科 盛人

    橋梁と基礎   60 ( 1 )   46 - 48   2026.1

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    Language：Japanese   Publishing type：Book review, literature introduction, etc.   Publisher：株式会社建設図書   Joint Work  

  • 津波荷重を受ける形状記憶合金を用いたコンクリート橋のレジリエンス評価 -カナダ・カルガリー大学の研究成果-

    山科 盛人，平尾 賢生，今村 光希，大庭 大，ガンフー フレルバートル，桐本 翔平，郡司 優太，島野 孝則，中島 大樹，濱野 北斗

    橋梁と基礎   59 ( 12 )   61 - 63   2025.12

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    Language：Japanese   Publishing type：Book review, literature introduction, etc.   Publisher：株式会社建設図書   Joint Work  

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Awards 【 display / non-display 】

  • 第79回年次学術講演会優秀講演者

    2024.10   土木学会   マーカ型ARを用いた橋梁点検支援システムにおける空間重畳精度向上の試み

    Individual or group name of awards：平尾 賢生

  • Best Presentation Award

    2024.4   The 70th Symposium on Structural Engineering   Evaluation for slip resistance of bolted joints including different contact surfaces with disk-type friction shims inserted

    Individual or group name of awards：Kensho HIRAO

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Other external funds procured 【 display / non-display 】

  • 鋼部材の当て板補修・補強における省力的設計・施工法の提案

    2025.6 - 2027.5

    「鋼構造研究・教育助成事業」(土木分野)

    Investigator(s)：田村 洋

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    Authorship：Coinvestigator(s) 

  • Evaluation of Load Carrying Capacity of High-Strength Bolted Joints with Nord-Lock Washers

    2024.4 - 2025.3

    Private Foundations 

    Investigator(s)：Kensho HIRAO

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    Authorship：Principal investigator 

  • Loose bolt detection by nut rotation history using AI image processing

    2023.7 - 2024.6

    Investigator(s)：Kensho HIRAO

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    Authorship：Principal investigator 

  • Evaluation of the existing performance of high-strength bolted friction joints considering the effect of uncertainty

    2022.6 - 2023.5

    Investigator(s)：Kensho HIRAO

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    Authorship：Principal investigator 

  • Evaluation of the existing performance of high-strength bolted friction joints considering the effect of uncertainty

    2021.6 - 2022.5

    Investigator(s)：Kensho HIRAO

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    Authorship：Principal investigator 

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Presentations 【 display / non-display 】

  • Evaluation of Coating Thickness on Faying Surface in High-Strength Bolted Friction Joints Using Ultrasonic Techniques and Machine Learning

    Kensho HIRAO

    IABSE Congress Ghent 2025  2025.8  IABSE

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    Event date： 2025.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Ghent   Country：Belgium  

    The slip coefficient of bolted joints is influenced by the thickness of inorganic zinc-rich paint applied to the faying surface. However, evaluating this coating thickness without disassembling bolted joints has been a significant challenge. In the ultrasonic approach, the reflection of ultrasonic waves and the resonance phenomenon at the interface are analyzed. By applying machine learning algorithms such as random forests, the characteristics of the reflected ultrasonic signals are analyzed to evaluate the coating thickness. This method first focused on evaluating the coating thickness on the backside of a steel plate, and then evaluated the coating thickness on faying surfaces of bolted joints. This evaluation provides a valuable basis for re-evaluating the structural performance of existing bolted joints according to current slip coefficient standards, enabling more accurate structural maintenance and performance evaluations.

  • Experimental Study on the Rotational Loosening Mechanism of High-Strength Bolts under Service

    Kensho HIRAO

    IABSE Symposium 2025  2025.5  IABSE

    　More details

    Event date： 2025.5

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Tokyo   Country：Japan  

  • MEASUREMENT OF STRAIN DISTRIBUTION ON CFRP-BONDED STEEL UNDER TENSILE LOADING AND CONSIDERATION OF DEBONDING INITIATION CONDITIONS

    Rintaro DOBASHI

    2025.11  Japanese Society of Steel Construction

    　More details

    Event date： 2025.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：Tokyo   Country：Japan  

  • FUNDAMENTAL STUDY ON STRESS EVALUATION OF STEEL MEMBERS USING LEEB HARDNESS

    Hikaru FUJITA

    2025.11  Japanese Society of Steel Construction

    　More details

    Event date： 2025.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：Tokyo   Country：Japan  

  • STUDY ON IMPROVING SLIP COEFFICIENT OF HIGH -STRENGTH BOLTED FRICTION JOINTS WITH FRICTION SIMS

    Ryoto YAMANISHI

    2025.11  Japanese Society of Steel Construction

    　More details

    Event date： 2025.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：Tokyo   Country：Japan  

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Charge of on-campus class subject 【 display / non-display 】

  • 2025   Experiment in Civil Engineering B

    College of Urban Sciences

  • 2025   Exercises on Structural Mechanics

    College of Urban Sciences

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Charge of off-campus class subject 【 display / non-display 】

  • 物理1及演習

    2024.4 Institution：法政大学

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    Level：Undergraduate (specialized) 

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Committee Memberships 【 display / non-display 】

  • Japan Steel Bridge Engineering Association "Working Group on Joints of Steel Bridges"

    2022.11  Academic Member

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    Committee type：Academic society 

  • Techno-Science Research Journal

    2024.11  Editor

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    Committee type：Academic society 

  • Bridge and Foundation Engineering

    2022.10 

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    Committee type：Other 

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