Modern Concrete Structures: Modelling and Assessment

现代混凝土结构：建模和评估

• 批准号: RGPIN-2015-06683
• 负责人: Vecchio, Frank
• 金额: $ 2.48万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=667668
• 关键词: Modern; Concrete; Structures; Modelling; Assessment

Reinforced concrete structures comprise much of the critical infrastructure in Canada, ranging from bridges to nuclear power plant structures, hospitals to multi-storey buildings. This infrastructure is at a mature stage, with many structures having aged and being in need of repair. In some cases, critical concrete buildings and bridges are vulnerable to loss of use or even catastrophic failure, owing to a number of factors but mostly due to inadequate maintenance over their lifetime. With governments currently facing severe economic constraints, and with the inventory of deficient concrete structures requiring repair amounting to hundreds of billions of dollars, engineers require advanced assessment tools. These tools would enable them to assess the safety and serviceability of current structures, decide which require repair, determine the most economical and effective means of repair, and properly model the performance of structures employing new innovative materials. ***     Reasonably reliable means of numerical simulation of traditional concrete structures in good repair are well established. Significant contributions towards this state-of-the-art were previously made at the University of Toronto with the formulation of simple and rational behavioural models for reinforced concrete (e.g., Modified Compression Field Theory), and the implementation of these models into advanced nonlinear finite element analysis (NLFEA) software (e.g., VecTor suite of programs). The current proposed research aims at extending the constitutive models and analysis procedures to enable the modelling and assessment of modern concrete structures, specifically those in various states of damage, deterioration or deficiency, and those constructed or repaired with new innovative materials. Accordingly, investigations are planned in five key areas of interest: ultra-high performance fibre reinforced concrete (UHPFRC); timber-concrete composite (TCC) systems; steel-concrete composite (SCC) systems; modeling and repair of deteriorated or corroded structures; and modeling and repair of alkali-aggregate reaction (AAR) affected structures. The proposed work will be multifaceted, encompassing theoretical formulation, material characterization, software development, and experimental verification.***     The anticipated outcomes and benefits of the proposed research are two-fold : i) The analytical models developed will be more encompassing and more accurate in their performance assessment of reinforced concrete structures.; and ii) The analysis programs will be developed to a level where they can be useful design office tools applicable to the types of problems faced by design engineers in Canada and elsewhere today. Thus, the proposed research will facilitate the design or restoration of technically- and economically-viable modern concrete structures that are safe, durable and efficient.*****

钢筋混凝土结构构成了加拿大的大部分关键基础设施，从桥梁到核电站结构，从医院到多层建筑。这一基础设施正处于成熟阶段，许多建筑物已经老化，需要维修。在某些情况下，关键的混凝土建筑物和桥梁很容易失去使用，甚至发生灾难性的故障，原因有很多，但主要是因为在其使用寿命内维护不足。由于各国政府目前面临严重的经济困难，而且需要修复的有缺陷的混凝土结构的库存高达数千亿美元，工程师需要先进的评估工具。这些工具将使他们能够评估现有结构的安全性和适用性，决定哪些结构需要修复，确定最经济有效的修复方法，并适当地模拟采用新创新材料的结构的性能。*建立了对维修完好的传统混凝土结构进行合理可靠的数值模拟的方法。多伦多大学以前对这一最先进的技术做出了重大贡献，建立了简单合理的钢筋混凝土行为模型(例如，改进的压力场理论)，并将这些模型应用到高级非线性有限元分析(NLFEA)软件(例如，向量程序套件)中。目前拟议的研究旨在扩展本构模型和分析程序，以便能够对现代混凝土结构进行建模和评估，特别是那些处于各种损伤、劣化或缺陷状态的结构，以及那些用新的创新材料建造或修复的结构。因此，计划在五个主要感兴趣的领域开展研究：超高性能纤维混凝土(UHPFRC)；木材-混凝土复合材料(TCC)系统；钢-混凝土复合材料(SCC)系统；劣化或腐蚀结构的模拟和修复；以及受碱-骨料反应(AAR)影响的结构的模拟和修复。拟议的工作将是多方面的，包括理论公式、材料表征、软件开发和实验验证。*表示，拟议研究的预期结果和好处有两方面：i)开发的分析模型将更全面、更准确地评估钢筋混凝土结构的性能；以及ii)分析程序将开发到可以成为有用的设计办公室工具的水平，适用于加拿大和其他地方设计工程师面临的类型的问题。因此，拟议的研究将有助于设计或修复在技术上和经济上可行的安全、耐用和高效的现代混凝土结构。