Effects of debris damming on bridges**

碎片筑坝对桥梁的影响**

• 批准号: 537570-2018
• 负责人: Nistor, Ioan
• 金额: $ 1.82万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 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=660986
• 关键词: Effects; debris; damming; bridges

The main goals of the current research program are to investigate the mechanisms of debris motion and impacts on bridges and to contribute to the development of new and reliable design tools. Research ideas proposed herein are direct results of observations and findings stemming from field investigations as well as of the criticism and the lack of clarity/validation of the provisions of the current design guidelines and standards with respect to debris motion and impact. ****The proposed project is a novel development which focuses on the numerical simulation and analysis of the influence of debris damming and associated loads on bridge piers in extreme hydrodynamic conditions. While of the previous studies were experimental, the proposed study will contribute to the knowledge through conducting a detailed numerical analysis and investigation under various flood conditions and under different turbulent hydrodynamic conditions. The objective of the current study is to build a numerical model simulating the presence of a mobile bed that can accurately simulate the scour at the bridge piers caused by debris damming. The model will be calibrated and validated using available experimental data. Subsequently, a number of scenarios will be simulated to characterize scour at bridge piers under different flows conditions and pier configurations. The final product of the study will provide the applicant's industrial partner (Golder) with a more accurate predictive numerical tool to assist with their provincial and national flood hazard studies. One of the primary challenges related to debris motion and associated effects is the stochastic nature of debris motion within these transient, high-velocity flow conditions. The currently used deterministic approach cannot adequately capture the physical processes involved in debris transport and, as such, the proposed research program presented herein aims to address this issue by performing high-quality, high-resolution, scale-varying numerical modelling of debris motion and loading to aid in the development of a probabilistic framework for the implementation in hazard and risk assessment across flood design guidelines and standards.**

当前研究计划的主要目标是研究碎片运动的机制以及对桥梁的影响，并为开发新的可靠设计工具的开发做出贡献。本文提出的研究思想是观察结果和发现的直接结果，以及批评以及缺乏对碎片运动和影响的当前设计指南和标准的规定的清晰/验证。 ****提出的项目是一个新的开发项目，侧重于在极端流体动力条件下碎片堵塞和相关载荷对桥墩的影响的数值模拟和分析。虽然先前的研究是实验性的，但拟议的研究将通过在各种洪水条件下以及在不同的湍流水动力条件下进行详细的数值分析和研究来促进知识。当前研究的目的是构建一个数值模型，模拟移动床的存在，该床可以准确模拟由碎屑堵塞引起的桥墩处的冲刷。该模型将使用可用的实验数据校准和验证。随后，将模拟许多方案，以表征在不同的流条件和码头配置下在桥墩处的冲刷。该研究的最终产品将为申请人的工业合作伙伴（Golder）提供更准确的预测数值工具，以协助其省和国家洪水危害研究。与碎片运动和相关作用相关的主要挑战之一是这些瞬态高速流条件中碎片运动的随机性质。当前使用的确定性方法无法充分捕获碎屑运输中涉及的物理过程，因此，本文提出的拟议的研究计划旨在通过执行碎屑运动的高质量，高分辨率，规模相反的数值建模以及负载来帮助开发跨危险和风险范围的范围范围和风险的范围，以帮助实施碎屑框架和造成灾害的范围。