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Researchers
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HIRAO Kensho
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Tokyo Institute of Technology Doctor Course Completed
Tokyo Institute of Technology Master Course Completed
Doctor of Engineering - Tokyo Institute of Technology
Duty Yokohama National UniversityFaculty of Urban Innovation Division of Urban Innovation Assistant Professor
Japan Society of Civil Engineers
Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Structural and seismic engineering
Others / Other / Steel structure
First Kind of High School Teacher License
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]
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]
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
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]
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
Effect of Biaxial Stress State of Steel Members on Leeb Hardness Test Results
Hikaru FUJITA, Hiroshi TAMURA, Kensho HIRAO, Hiroshi KATSUCHI, Jiaqi WANG
IABSE Young Engineers Colloquium 2025.5
Language：English Publishing type：Research paper (international conference proceedings) Publisher：IABSE Joint Work
Experimental Method for Introducing Reversed Cyclic Elastoplastic Strain Histories with Large Amplitude into Structural Steels
Taiji YAMATO, Hiroshi TAMURA, Kensho HIRAO, Jiaqi WANG, Hiroshi KATSUCHI
2024.11 [Reviewed]
Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Joint Work
Kensho HIRAO, Quang Vy TRAN, Hiroshi TAMURA
Journal of Structural Engineering 70A ( 0 ) 61 - 74 2024.3 [Reviewed]
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers Joint Work
There is concern that the slip coefficient of high-strength bolted joints with different faying surfaces may be lower than that of conventional joints, and it has been reported that the slip coefficient is improved by inserting friction shims. In this study, shims were modified to be disk-shaped, which can be inserted into each bolt hole, for application to arbitrary bolted joints, and their slip resistance was evaluated by slip resistance tests. As a result, it was confirmed that a slip coefficient of 0.6 or higher could be expected with the insertion of shims. Failure modes of the contact surfaces were also investigated by dismantling the specimens after the test and observing the contact surfaces.
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
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
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]
Authorship：Lead author Language：Japanese Publishing type：Internal/External technical report, pre-print, etc. Publisher：Japan Bridge Engineering Center Single Work
多点支持旋回システムによる斜張橋主塔部の施工-襄陽北操車場橋／中国・湖北省-
山科 盛人，平尾 賢生，桐本 翔平，今村 光希，ガンフー フレルバートル，大庭 大，中島 大樹，濱野 北斗，島野 孝則，舟橋 景介
橋梁と基礎 59 ( 8 ) 134 - 134 2025.8
Language：Japanese Publishing type：Book review, literature introduction, etc. Publisher：株式会社建設図書 Joint Work
薄肉プレキャストセグメントを用いた箱桁断面へのプレストレス導入の検討-オーストリアのプレキャストセグメントの薄肉化への挑戦-
大庭 大，平尾 賢生，山科 盛人，桐本 翔平，今村 光希，ガンフー フレルバートル，中島 大樹，濱野 北斗，島野 孝則，舟橋 景介
橋梁と基礎 59 ( 8 ) 135 - 135 2025.8
Language：Japanese Publishing type：Book review, literature introduction, etc. Publisher：株式会社建設図書 Joint Work
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
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
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
Authorship：Principal investigator
Loose bolt detection by nut rotation history using AI image processing
2023.7 - 2024.6
Investigator(s)：Kensho HIRAO
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
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
Authorship：Principal investigator
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
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
Event date： 2025.5
Language：English Presentation type：Oral presentation (general)
Venue：Tokyo Country：Japan
マーキングに基づくボルト-ナット相対回転角度の定量的評価による締め忘れ検出
平尾賢生
土木学会第80回年次学術講演会 2025.9 土木学会
Event date： 2025.9
Language：Japanese Presentation type：Oral presentation (general)
Venue：熊本 Country：Japan
鋼部材の2軸応力状態がリーブ硬さ試験結果に及ぼす影響
藤田光
土木学会第80回年次学術講演会 2025.9 土木学会
Event date： 2025.9
Language：Japanese Presentation type：Oral presentation (general)
Venue：熊本 Country：Japan
溶融亜鉛めっきを有する高力ボルト摩擦接合継手異種接合面のすべり係数評価
横山大翔
土木学会第80回年次学術講演会 2025.9 土木学会
Event date： 2025.9
Language：Japanese Presentation type：Oral presentation (general)
Venue：熊本 Country：Japan
2025 Experiment in Civil Engineering B
College of Urban Sciences
2025 Exercises on Structural Mechanics
College of Urban Sciences
物理1及演習
2024.4 Institution：法政大学
Level：Undergraduate (specialized)
Japan Steel Bridge Engineering Association "Working Group on Joints of Steel Bridges"
2022.11 Academic Member
Committee type：Academic society
Techno-Science Research Journal
2024.11 Editor
Committee type：Academic society
Bridge and Foundation Engineering
2022.10
Committee type：Other
