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Study on System for Maintenance and Control of Structures as Social Foundation

社会基础结构物维护与控制系统研究

基本信息

批准号：
14205064
负责人：
MACHIDA Atsuhiko
金额：
$ 35.28万
依托单位：
Saitama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14205064/
关键词：
Management and control system Diffusion coefficient Electro-migration method Deterioration due to chloride ion Carbonation Alkali-aggregate reaction Deterioration due to combined effects Acoustic emission method 維持・管理補修・補強モニタリング劣化

项目摘要

Elemental technologies that are needed to constitute maintenance and control system for structures were intensively studied and it was tried to develop an advanced system, incorporating obtained results to the existing system. The results on elementary technologies are as follows.(1)The factors that have a great influence on the distribution of unsteady-state chloride ion concentrations were made clear, and the effects of cracks on the diffusion of chloride ions was quantified.(2)The estimation methods of deterioration due to chloride ions, carbonation and leaching of calcium ions were developed, and a monitoring method on deterioration due to macro-cell corrosion as well as an electrodeposition method was presented.(3)The residual tensile strain was presented as an index of deterioration due to freezing and thawing, and a mechanical model of concrete to analyze the change of structural performances was developed, introducing this index.(4)Several facts were found on the effect of alka … More li-silica reaction(ASR) on the load carrying capacity of structures.(5)The effect of ASR combined with chloride ion on the corrosion of re-bars was quantitatively made clear, and it was presented that the corrosion speed due to combined attack of chloride ion and carbonation can be analytically predicted.(6)It was confirmed that the acoustic emission method can be applied to the diagnostic check on deterioration of concrete structures in use, and several results were obtained on monitoring methods for crack distributions and so forth of concrete structures by sensing using optical fibers.(7)An analytical method, in which the rigid body spring model is combined with the truss network model was developed to treat changes of internal strain accompanied by movement of substances due to deterioration of concrete.(8)The strengthening effects of FRP sheet wrapping and steel jacketing were studied experimentally and the method was developed to evaluate the effects analytically.It can be said that the maintenance and control system was improved greatly introducing the above-mentioned academic results, even the framework did not change so much. Less

对构成结构维护和控制系统所需的基本技术进行了深入研究，并试图开发一种先进的系统，将所获得的结果与现有系统相结合。基本技术的结果如下。（1）明确了影响非稳态氯离子浓度分布的主要因素，量化了裂缝对氯离子扩散的影响。（2）建立了氯离子、碳酸化和钙离子溶出引起的劣化评价方法，提出了宏电池腐蚀劣化监测方法和电沉积法。（3）提出残余拉应变作为混凝土冻融劣化的指标，建立了混凝土冻融劣化的力学模型。（4）发现了碱对植物生长的影响 ...更多信息锂硅反应（ASR）对结构承载能力的影响。（5）定量地研究了ASR与氯离子复合作用对钢筋腐蚀的影响，提出了可以用解析法预测氯离子和碳化复合作用下钢筋的腐蚀速度。(6)It确认了声发射法可应用于在用混凝土结构劣化的诊断检查，并在通过光纤传感监测混凝土结构裂缝分布等方法方面取得了一些成果。(7)An提出了一种将刚体弹簧模型与桁架网络模型相结合的分析方法，用于处理混凝土劣化引起的内部应变随物质运动而变化的问题。（8）通过试验研究了FRP片材包裹和钢套的加固效果，并建立了加固效果的分析评价方法，可以说，在结构没有太大变化的情况下，采用上述理论研究成果，维修控制系统得到了很大的改善。少