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Title: 鋼床版舗装のぜい性領域における引張破壊性状と縦亀裂の評価法に関する一考察
Other Titles: A Study of Tensile Fracture Properties at Low Temperature of Asphalt Pavement on Steel Deck Bridges and Evaluation Method of Longitudinal Cracking
Authors: 山本, 泰幹1 Browse this author
森吉, 昭博2 Browse this author →KAKEN DB
Authors(alt): Yamamoto, Yasumiki1
Moriyoshi, Akihiro2
Keywords: steel deck
asphalt pavement
longitudinal cracking
brittle point
Issue Date: Apr-2006
Publisher: 土木学会
Journal Title: 土木学会論文集. E
Volume: 62
Issue: 2
Start Page: 286
End Page: 294
Publisher DOI: 10.2208/jsceje.62.286
Abstract: 鋼床版舗装の縦亀裂に対して,首都圏の最低気温付近でも生じるぜい性破壊現象に着目し,各種混合物のぜい化点付近における引張破壊性状を検討した.この結果,骨材粒度やアスファルトの種類によって混合物の破壊性状が異なるため,載荷条件(荷重・速度)が同じ場合でも,縦亀裂の発生状況が変化することがわかった.そこで,ぜい性領域における縦亀裂の判定法として,混合物の引張破壊ひずみやぜい化点に基づき,舗装表面の発生ひずみを数値的に評価する方法を提案する.本手法は,長期フィールド試験でも良好な結果を得ている.また,新しい混合物や種々の構造形式でも縦亀裂の判定を容易に行うことができるため,これまでになかったぜい性領域における舗装破壊の定量的評価が一般的に可能となる.
This paper pays attention to brittle fracture phenomenon at low temperature to investigate the cause of longitudinal surface cracking of asphalt pavement on steel deck bridges, and examined fractue properties around the brittle point of asphalt mixtures with tensile tests and FEM analysis. The results revealed that the asphalt mixtures considered in this study have different fracture properties and a certain mixture possibly fracrures under a pareticular loading and temperature condition where the other materials do not. Based on the brittle point and failure tensile strain, a method of numerically evaluating the possibility of occurrence of surface cracking on an asphalt mixture was developed, which can be easily applied to new types of asphalt materials and various types of bridge structures. This method was validated by long term field observation on an actual pavement on a steel deck. (It allows the geneal and quantitative evaluation of brittle pavement fracture, which has never been possible.)
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 森吉 昭博

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