Man-made Hazard Mitigation of Reservoir Dams: Monte Carlo Simulation with Multiscale Modeling of Concrete and Accurate Fluid-Structure Interaction

该项目的主要目标是研究有效的计算方法，以便对受到人为危害（如爆炸和侵彻）的水坝进行失效和可靠性分析。这需要对水库/大坝溃坝响应进行精确的建模，而现有的计算工具对这一问题的处理并不令人满意。研究方法从主要材料异质性的长度尺度上的混凝土概率建模发展到用于分析大型结构的多尺度框架的制定。然后通过一种新的流固耦合算法将大坝的计算模拟与水库水的模拟相结合。最后，利用所开发的框架计算了弹丸侵彻和空气爆破的失效概率。本研究的成功完成将导致从业者可用的大坝破坏分析计算工具的重大改进。工程师将能够准确地评估现有水坝的故障概率，大坝管理者将能够利用这些评估来确定投资和资源的优先次序。此外，这项研究将对教育和促进多样性产生重大影响，通过广泛的活动，旨在让大学预科生、本科生和研究生，特别是那些属于少数民族和代表性不足群体的学生参与进来。这主要是通过在虚拟现实世界的背景下开发在线NSF弹性基础设施虚拟中心（VCRI）来实现的。“第二人生”?(SL)。VCRI将为外展活动、传播和培训提供前所未有的机会。

The main objective of this project is to study effective computational methods that will allow the failure and reliability analysis of dams subjected to man-made hazards, such as blast and penetration. This requires the accurate modeling of reservoir/dam failure response, which is not handled satisfactorily by available computational tools. The research approach progresses from the probabilistic modeling of concrete at the length scale of the major material heterogeneities to the formulation of a multi-scale framework for the analysis of large structures. The computational simulation of the dam is then coupled with the simulation of the reservoir water through a novel fluid-structure interaction algorithm. Finally, the developed framework is used to compute the probability of failure associated with projectile penetration and air-blasting.The successful completion of this research will lead to a significant improvement in the computational tools for dam failure analysis available to practitioners. Engineers will be able to assess accurately the probability of failure of existing dams and dam administrators will be able to use these assessments to prioritize investments and resources. In addition, the research will have a significant impact on education and promotion of diversity through the wide range of activities aimed at the involvement of pre-college, undergraduate, and graduate students, especially those belonging to minority and underrepresented groups. This is achieved mainly by the development of an online NSF Virtual Center for Resilient Infrastructures (VCRI) in the context of the virtual reality world ?Second Life? (SL). The VCRI will give unprecedented opportunities for outreach activities, dissemination, and training.