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

该学院早期职业发展（CAREER）计划奖的研究目标是将基于性能的设计和多目标优化集成到一个计算框架中，以支持关键建筑物的抗震设计。重点放在关键建筑物上，如急诊医院和应急中心，因为这些建筑物在社区应对地震事件和随后的恢复中发挥着关键作用。这些建筑物功能的破坏可能产生连锁反应，造成重大的社会损失。虽然这里的重点是关键建筑物的抗震设计，但开发的综合框架将适用于所有类型的建筑物和各种自然灾害。基于性能的抗震设计（PBSD）提供了事后功能或经济损失的决策变量。然而，PBSD过程可能会导致一个令人满意的，但不一定是最佳的设计解决方案。此外，PBSD过程的启发式性质并没有提供对鲁棒性和成本效益的权衡的理解。本研究将寻求一个综合的计算框架，同时识别创新的结构概念和相互冲突的设计目标之间的权衡，以支持决策。本研究将开发一个计算框架，集成概率抗震性能评估方法和多目标算法。将分三个阶段对综合框架进行测试和验证。每个阶段都涉及到更高级别的数学建模和计算复杂性。在第二阶段，将开发一个改进的医院功能模型，并将其纳入框架，以了解物理损坏如何影响功能，并确定创新的地震保护系统概念，最大限度地提高事后功能，同时平衡相互冲突的设计目标，如最大限度地降低建筑成本。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，以了解模型因素中的不确定性如何通过框架传播。综合教育活动的目的是解决需要了解如何在各级教育工程复杂的系统。这些活动包括各种技术，以揭示冲突的目标和技术之间的权衡，以确定平衡的多个冲突的目标。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.