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.

本研究的最终目标是开发一种无损检测方法，可以轻松定量地评估公路桥梁钢筋混凝土板的开裂状况。在这里，作为研究工作的第一步，通过实验和分析方法研究了有或没有穿过深度裂缝的混凝土板对轻冲击载荷的动态响应。板的响应通过 FEM 计算为 3 维振动问题，使用弹性模型，其中链接元素代表样本中的裂纹。主要研究结论如下： 1．只要对冲击载荷和边界条件进行精确建模，通过3-DFEM分析就可以满意地评估带有贯穿深度裂缝的板的动态响应。2．基于实验和分析研究，证实了可以通过板坯竖向加速度的倾倒特征来检测是否存在贯穿深度的裂纹。

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）。