CAREER: Hybrid Simulation Platform for Seismic Performance Evaluation of Structures Through Collapse

该学院早期职业发展(CALEAR)项目的研究目标是增强混合模拟方法，以评估加载到倒塌的大型结构的性能。混合模拟将结构单元的数值模拟和试验模拟相结合，为结构体系在地震荷载作用下的试验提供了一种更真实、更可靠、更经济的方法。将在开发用于测试和验证程序的算法方面作出根本性贡献，解决与数值、实验和边界条件误差和假设有关的问题。特别是，计算平台将提供稳健的隐式积分算法和容错分布式控制策略的能力，以便能够利用其子结构的地理分布测试来测试复杂的结构系统。所建立的试验模拟平台将用于评估大型钢框架结构从破坏开始到倒塌的抗震性能。将只对关键部件进行实验测试，并通过与数值模型的相互作用来捕获全球系统响应。混合模拟预测坍塌的有效性将通过比较最近在日本进行的全面测试结果来验证。本项目开发的改进的混合模拟平台建成后，可以用来生成结构部件和系统从开始破坏到倒塌的完整易损性，满足下一代基于性能的地震工程的要求。它还可以用来评估现行建筑规范中固有的建筑物倒塌安全裕度。特别是，通过大规模的混合试验计划和数值模拟研究，将提高我们对钢结构建筑抗震性能的理解。综合教育和外展计划将导致编制新的课程材料，并在结构设计过程的不同阶段培训研究生和本科生，如初步设计、计算机模拟、设计修改、施工和物理测试。外联活动是与布法罗大学教育研究生院和当地学区合作计划的，将包括代表性不足的学生。

The research objective of this Faculty Early Career Development (CAREER) Program project is to enhance the hybrid simulation methodology to evaluate the performance of large scale structures loaded up to collapse. Hybrid simulation, which combines numerical simulation with experimental simulation of structural elements, provides a more realistic, reliable, and economical approach to testing structural systems under earthquake loads. Fundamental contributions, addressing issues related to numerical, experimental and boundary condition errors and assumptions, will be made in the development of algorithms used in testing and validation procedures. In particular, the computational platform will provide capabilities for robust implicit integration algorithms and fault-tolerant distributed control strategies to enable testing of complex structural systems utilizing geographically distributed testing of its substructures. The resulting testing and simulation platform will be used to evaluate the seismic performance of large-scale steel moment frame structures from the onset of damage through collapse. Only key subassemblies will be experimentally tested and the global system response will be captured through interaction with the numerical model. The efficacy of hybrid simulations to predict collapse will be validated by comparing the results recently obtained from full scale testing in Japan. Upon its completion, the improved hybrid simulation platform developed in this project can be used to generate complete fragilities of structural components and systems from the onset of damage through collapse as required for next-generation performance-based earthquake engineering. It can also be used to assess the collapse safety margin of buildings inherent in current building codes. In particular, our understanding of the seismic performance of steel buildings will be improved through the large-scale hybrid testing program and numerical simulation studies. An integrated education and outreach plan will lead to development of new curriculum material and training of graduate and undergraduate students in various stages of structural design process such as preliminary design, computer simulation, design revision, construction and physical testing. The outreach activities are planned in partnership with the University at Buffalo Graduate School of Education and local schools districts, and they will include underrepresented students.