Structural reliability assessment of existing reinforced concrete wharves in NS by considering the impact of climate change

考虑气候变化影响的新斯科舍省现有钢筋混凝土码头结构可靠性评估

• 批准号: 568657-2021
• 负责人: Oudah, Fadi
• 金额: $ 2.19万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=723745
• 关键词: Structural; reliability; assessment; existing; reinforced

Reinforced concrete wharves deteriorate with time due to environmental exposure. Design codes account for the deterioration of reinforced concrete in predicting the service life of structures. However, these predictions are based on historical data that do not necessarily account for the projected change in the ocean chemistry and environmental exposure in the shores of Nova Scotia due to Climate Change. The goal of this partnership is to develop a reliability-based robust analytical framework to predict the service life of existing reinforced concrete wharves by considering the impact of the changing environment on the deterioration mechanism of wharf structures, and to apply the developed tool to examine the service life of existing wharves at the Port of Halifax. The proposed tool will account for the spatial variability of the material characteristics (i.e. randomness in the concrete properties in existing wharves), and the stochastic nature of loads (i.e. randomness in the applied loads) through a probabilistic framework of analysis. The tool will be programmed in a user-friendly standalone computer application that can be used by standard engineers. The proposed research has a three-fold impact on Nova Scotia and Canada: understanding the impact of changing environment on the structural safety of wharves helps in proposing new design measures to extend the service life of wharves, and hence, optimize the cost-life analysis of the wharf (economic), quantifying the structural safety of existing wharves helps wharf users in understanding the risk involved in operation (societal), predicting the need for structural repairs helps in optimizing the resources and reduce the carbon footprint associated with wharf rehabilitation projects (environmental).

由于环境暴露，钢筋混凝土码头会随着时间的推移而劣化。在预测结构的使用寿命时，设计规范考虑了钢筋混凝土的劣化。然而，这些预测是基于历史数据，这些数据不一定说明气候变化导致新斯科舍省海岸海洋化学和环境暴露的预测变化。这一伙伴关系的目标是开发一个基于可靠性的稳健分析框架，通过考虑环境变化对码头结构劣化机制的影响来预测现有钢筋混凝土码头的使用寿命，并将开发的工具应用于审查哈利法克斯港现有码头的使用寿命。拟议的工具将通过概率分析框架考虑材料特性的空间变异性(即现有码头混凝土特性的随机性)和荷载的随机性质(即施加荷载的随机性)。该工具将在用户友好的独立计算机应用程序中进行编程，标准工程师可以使用该应用程序。拟议的研究对新斯科舍省和加拿大有三方面的影响：了解环境变化对码头结构安全的影响有助于提出新的设计措施，以延长码头的使用寿命，从而优化码头的成本-寿命分析(经济)，量化现有码头的结构安全，帮助码头使用者了解运营所涉及的风险(社会)，预测结构维修的需求，有助于优化资源，减少与码头修复项目相关的碳足迹(环境)。