Development of the diagnosis technology of the prestressed concrete bridge which PC force decreased

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K06443
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Toyama Prefectural University
• Principal Investigator: Ito Hajime 富山県立大学, 工学部, 教授 (10553133)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: PC橋梁 / コンクリート / 応力解放 / コア削孔 / 埋込みセンサ / プレストレス量 / 応力解析

Outline of Final Research Achievements

Purpose of this study is the development of measurement method of the effective pre-stress in the pre-stressed concrete bridge (PC bridge) by the stress release method by the coring. Firstly, several kinds of sensor and measurement method were examined. Then sensor and measurement method to use for the coring test were decided based on sensitivity tests.
Next, in actual PC beam, coring test by the developed method and PC bar cutting test were carried out and their results were investigated. The measurement precisions of standard type (coring diameter 100mm) and small type (coring diameter 50mm) were clarified after comparison of two tests and simulation of results. In addition, numerical analysis method was examined in order to convert from released strain to internal force of PC bridge.

Free Research Field

コンクリート工学

Academic Significance and Societal Importance of the Research Achievements

本研究は、我が国の橋梁の約40%を占めるプレストレストコンクリート形式の橋梁（PC橋梁）を対象とした。老朽化したPC橋梁では、橋梁自体の形状や性能を保持するために必要な力が低下する場合があり、本研究ではその力の低下量を計測する手法を検討した。検討では、数種類のセンサと計測方法の特徴を分析し、計測精度を把握した。
この計測結果に基づき、PC橋梁の内部に作用する力を推定することができ、老朽化した橋梁の点検診断や補強設計を適切に実施することが可能である。