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发展一种无损检测方法，可以方便地定量评估公路桥梁钢筋混凝土板的开裂情况。在这里，作为第一步的研究工作，混凝土板的动态响应，无论是通过深度裂缝和没有，轻冲击荷载通过实验和分析方法进行了研究。板的响应通过有限元计算作为三维振动问题，使用弹性模型与连接单元代表试样中的裂纹。主要研究结论如下：1.在精确模拟冲击荷载和边界条件的前提下，三维有限元分析可以较好地评价含贯通裂纹板的动力响应.基于实验和分析研究，它被证实，通过深度裂缝的存在可以检测的垂直加速度在板的倾倒特性。

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）。