CAREER: A Performance-Based Multi-Objective Optimization Framework to Define Innovative Structural Concepts and Support the Seismic Design of Critical Buildings

这项教师早期职业发展（Career）项目的研究目标是将基于性能的设计和多目标优化整合到一个单一的计算框架中，以支持关键建筑的抗震设计。重点放在关键建筑上，如急症护理医院和紧急反应中心，因为这些建筑在社区对地震事件的反应和随后的恢复中起着关键作用。对这些建筑功能的破坏可能产生连锁效应，导致重大的社会损失。虽然这里的重点是关键建筑的抗震设计，但开发的综合框架将适应所有类型的建筑和各种自然灾害。基于性能的抗震设计（PBSD）为震后功能或经济损失提供了决策变量。然而，PBSD过程可能导致一个令人满意的，但不一定是最优的设计解决方案。此外，PBSD过程的启发式性质不能提供对鲁棒性和成本效益权衡的理解。这项研究将追求一个集成的计算框架，同时识别创新的结构概念和冲突设计目标之间的权衡，以支持决策。该研究将开发一个集成概率地震性能评估方法和多目标算法的计算框架。综合框架将分三个阶段进行测试和验证。每个阶段都涉及到更高水平的数学建模和计算复杂性。与第二阶段相结合，将开发一个改进的医院功能模型，并将其纳入框架，以深入了解物理损伤如何影响功能，并确定创新的地震防护系统概念，在平衡相互冲突的设计目标（如最小化建筑成本）的同时，最大限度地提高事后功能。在第三阶段之后，将对基于性能的综合多目标优化框架进行基于全局方差的敏感性分析，以了解模型因素的不确定性如何通过框架传播。综合教育活动旨在满足理解如何在各级教育中设计复杂系统的需要。这些活动包括揭示冲突目标之间权衡的各种技术，以及识别平衡的多个冲突目标的技术。教育活动的目标群体从K-12学生到K-12教育工作者到博士生，并围绕适合每个教育水平的工程问题进行设计。

The research objective of this Faculty Early Career Development (CAREER) program award is to integrate performance-based design and multi-objective optimization into a single computational framework to support the seismic design of critical buildings. The emphasis is placed on critical buildings, such as acute care hospitals and emergency response centers, because these buildings play a key role in a community's response to an earthquake event and subsequent recovery. Disruption to the functionality of these buildings can have cascading effects resulting in significant societal losses. Although the focus here is on the seismic design of critical buildings, the integrated framework developed will be adaptable to all types of buildings and various natural hazards. Performance-based seismic design (PBSD) provides decision variables for post-event functionality or economic loss. However, the PBSD process is likely to lead to a satisfactory but not necessarily optimal design solution. Furthermore, the heuristic nature of the PBSD process does not provide understanding of the tradeoffs of robustness and cost-effectiveness. This research will pursue an integrated computational framework that simultaneously identifies innovative structural concepts and tradeoffs between conflicting design objectives to support decision-making.The study will develop a computational framework that integrates probabilistic seismic performance assessment methodology and multi-objective algorithms. The integrated framework will be tested and validated in three phases. Each phase involves an increased level of mathematical modeling and computational complexity. In conjunction with the second phase, an improved hospital functionality model will be developed and incorporated into the framework to gain insights about how physical damage affects functionality and to identify innovative seismic protective system concepts that maximize post-event functionality while balancing conflicting design objectives, such as minimizing building cost. Following the third phase, a global variance-based sensitivity analysis will be performed on the integrated performance-based multi-objective optimization framework to understand how uncertainties in model factors propagate through the framework. The integrated educational activities are designed to address the need for understanding how to engineer complex systems at all levels of education. These activities include various techniques to reveal tradeoffs between conflicting objectives and techniques to identify balanced multiple conflicting objectives. The educational activities target groups ranging from K-12 students to K-12 educators to doctoral students and have been designed around engineering problems appropriate for each educational level.