Non-destructive test method for highway bridge RC slabs by dynamic response to light impact load.

公路桥梁钢筋混凝土板轻冲击荷载动态响应无损检测方法

• 批准号: 06650498
• 负责人: HIGAI Takeshi
• 金额: $ 1.47万
• 依托单位: Yamanashi Unversity
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650498/
• 关键词: RC slabs; Highway bridges; Inspection; Impact response; Through the depth cracks; FEM analysis; 健全度判定方法; 解析方法

Final objective of this study is to develop a non-destructive test method, which can easily and quantitatively evaluate the condition of cracking in the RC slabs of highway bridges. Here, as a first step of the research work, dynamic response of concrete slabs, both with and without through the depth cracks, to the light impact load is studied through experimental and analytical approaches. Response of the slabs were calculated by FEM as the 3-dimensional vibration problem using elastic model with link elements representing the cracks in the specimen. Main conclusions of the studies are as follows.1. Provided the impact load and boundary conditions are accurately modeled, dynamic response of the slabs with through the depth cracks can be satisfactorily evaluated by 3-DFEM analysis.2. Based on both experimental and analytical studies, it is confirmed that the presence of through the depth cracks could be detected by the dumping characteristics of vertical acceleration in the slabs.

本研究的最终目的是建立一种能够方便、定量地评价公路桥梁RC板开裂状况的无损检测方法。本文作为研究工作的第一步，通过实验和分析的方法，研究了带和不带深度裂缝的混凝土板在轻冲击荷载作用下的动力响应。采用弹性模型，连接单元代表试件中的裂纹，将板的响应计算为三维振动问题。研究的主要结论如下：1。在精确模拟冲击载荷和边界条件的前提下，采用3-DFEM分析方法可以较好地评价带深度裂纹板的动力响应。通过试验和分析研究，证实了通过竖向加速度的倾倒特性可以检测到纵深裂缝的存在。

项目成果

H.Kato, T.Higai, H.Nakamura: "Analytical study on the response of concrete slabs subjected to light impact loading." Proc. of the Japan Concrete Institute. Vol.17-No.2. 1181-1186 (1995)

H.Kato、T.Higai、H.Nakamura：“混凝土板在轻冲击载荷作用下的响应分析研究。”

加藤宏康: "軽い衝撃を受けるコンクリート部材の応答に関する解析的研究" コンクリート工学年次論文報告集. 17-1. 1181-1186 (1995)

Hiroyasu Kato：“混凝土构件受光冲击响应的分析研究”混凝土工程年度报告 17-1（1995）。