Evaluation of Holding Strength of Existing Steel Bridges and Development of Health Monitoring System Based on It.

现有钢桥握力评估及基于此的健康监测系统开发。

• 批准号: 10355019
• 负责人: MIKI Chitoshi
• 金额: $ 17.15万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10355019/
• 关键词: Steel Bridge; Health Evaluation; Monitoring; Database; Weigh-in-Motion; Deformation due to Temperature; Identification of Structure; Non-Destructive Test; 光ファイバー; 温度変化; 長期測定; ウェインモーション; 既設鋼橋; 現有耐力; 合成桁; プルーフローディングテスト; 付着; 打ち抜き試験; 界面

This year was the final year of this project, and the summary of the research results of this year is as follows.(1) The database of the examples of damage cases was opened on Internet. It includes the evaluation of the causes of them and the repairing methods with their effects. The system for updating this database was also developed to add the latest information on damages from the domestic and overseas investigators.(2) The system for Weigh-in-Motion was developed to measure the axle weight of vehicles on existing bridges automatically. In this year, the improvements of the system were done to make the accuracy better by introducing the measuring system of the velocity of vehicles from the strain data at two different positions.(3) In order to investigate the influence of the change of temperature on the deformation characteristics of steel bridges, the observation of the behavior during cooling process of a girder specimen with concrete slab were carried out. In the tests, the who … More le girder specimen was warmed up to some temperature, and then it was opened to the air to be made cool. In this study, the influence of the difference of heat capacity between steel and concrete, and the influence of the difference of the supporting condition (fix or free) at the shoe were considered. In addition to the testing results, with considering the results of FEM analysis of the specimen, the possibility of the application of deformation due to temperature to bridge monitoring was discussed.(4) The FEM analysis model was built to identify the structure system of the whole of a steel bridge including the superstructure and piers. It was built without considering some assumptions in design, but with considering the actual configuration of the bridge. The resu lts of the analysis with the load measured in (2) applied showed good agreements with the actual behavior of the bridge.(5) With the system of real-time remote monitoring system utilizing optical fiber network that was developed by the last year, by using the system above-mentioned in (2) and (4), the system to monitor health and damage of steel bridge was built, and in present, the system is in long term use. Less

今年是本项目的最后一年，今年的研究成果总结如下：(1)在互联网上开通了损失案例数据库。包括对其产生原因的评价和修复方法及其效果。还开发了数据库更新系统，以添加国内外调查人员的最新损伤信息。(2)开发了动态称重系统，用于对既有桥梁上的车辆轴重进行自动测量。为了研究温度变化对钢桥变形特性的影响，对混凝土板梁试件降温过程中的行为进行了观测。在测试中，Who…将更多的LE梁试件加热到一定温度，然后将其敞开至空气中冷却。在本研究中，考虑了钢材和混凝土之间的热容差异以及鞋底支承条件(固定或自由)的差异的影响。在试验结果的基础上，结合试件的有限元分析结果，探讨了温度变形应用于桥梁监测的可能性。(4)建立了钢桥上部结构和桥墩整体结构体系的有限元分析模型。它是在设计时没有考虑一些假设的情况下建造的，但考虑了桥梁的实际配置。(5)结合去年开发的基于光纤网络的远程实时监测系统，利用上述(2)和(4)中的系统，建立了钢桥健康与损伤监测系统，目前该系统已长期投入使用。较少

项目成果

M.Yamada,D.Mita and C.MIKI: "Evaluation of the Real Loading Capacity Carried on Existing Plate Girder Bridges" Review of Structural Steel PSSC‘98. 1199-1204 (1998)

M.Yamada、D.Mita 和 C.MIKI：“现有板梁桥的实际承载能力评估”钢结构 PSSC‘98 评论 (1998)。

Ryoichi TANAKA and Sohichi HIROSE: "50^<th> Conference of Theoretical Applied Mechanics"NONDESTRUCTIVE EVALUATION OF INTERFACE BETWEEN STEEL AND CONCRETE BY LAMB WAVES. 2000

Ryoichi TANAKA 和 Sohichi HIROSE：“第 50 届理论应用力学会议”通过兰姆波对钢与混凝土之间的界面进行无损评估。

Chitoshi MIKI, Hiromi SHIRAHATA, Akari NISHIDA, and Yasutoshi YAGIMUMA: "NONDESTRUCTIVE EVALUATION OF BUTT WELDED JOINTS BY TANDEM ARRAY TRANSDUCER"Proceedings of JSCE. No.654/I-52. 281-294 (2000)

Chitoshi MIKI、Hiromi SHIRAHATA、Akari NISHIDA 和 Yasutoshi YAGIMUMA：“通过串联阵列传感器对对接焊缝进行无损评估”JSCE 论文集。

Satorn PENPHON, Chitoshi MIKI, Atsushi ICHIKAWA, and Susumu NAGAE: "JSCE Annual Meeting"EFFECT ON BRIDGE RESPONSE INDUCED BY TRAFFIC VEHICLES AFTER MODIFICATION OF THE BRIDGE STRUCTURE. 2000

Satorn PENPHON、Chitoshi MIKI、Atsushi IHIKAWA 和 Susumu NAGAE：“JSCE 年会”对桥梁结构改造后交通车辆引起的桥梁响应的影响。

Ryoichi TANAKA and Sohichi HIROSE: "JSCE Annual Meeting"NONDESTRUCTIVE EVALUATION OF MATERIAL INTERFACES BY SUREACE ACOUSTIC WAVES. 2000

Ryoichi TANAKA 和 Sohichi HIROSE：“JSCE 年会”通过 SUREACE 声波对材料界面进行无损评估。