报告主题 ： Integrating Real-Time Hybrid Simulation with Multi-Fidelity Monte Carlo Predictor for Seismic Fragility Assessment

主讲专家 ： 陈城 教授

主 持 人 ： 陈再现 教授

报告时间 ： 2023年07月15日 9:30

报告地点 ： 研究院1号楼北621

报告摘要 ： Seismic fragility evaluates the performance of a structure regarding to its capability to withstand earthquake loads by describing the exceedance probability for selected engineering demand parameters. High-fidelity (HF) models are essential for simulation-based techniques to obtain accurate fragility assessment in the presence of uncertainties. Dynamic structural behavior however is often difficult to replicate realistically through numerical simulation, especially when parts of the structure are difficult for accurate modeling due to their inherent complex nonlinearity. This study presents the integration of real-time hybrid simulation (RTHS) with multi-fidelity Monte Carlo predictor (MFMC) for seismic fragility analysis. RTHS combines physical testing of experimental substructures and numerical modeling of analytical substructures thus presenting a cyber-physical alternative for high fidelity seismic performance evaluation. MFMC predictor provides an optimized allocation algorithm that makes full use of data from both HF and low-fidelity (LF) models to achieve unbiased estimation for response quantities of interests. Experimentally expensive HF data from RTHS is thus integrated with computationally cheap simulation of LF numerical models through MFMC to facilitate seismic fragility analysis. A two-story steel moment resisting frame (MRF) with self-centering viscous dampers (SC-VDs) is utilized to demonstrate the effectiveness and efficiency of proposed method. Analysis demonstrates that the proposed method provides a promising technique for seismic fragility assessment especially when accurate modeling is not available due to complex structural behavior.

主讲人介绍：陈城博士，现任美国加利福尼亚州旧金山州立大学工程学院教授，先后于1999 年和2002年在同济大学获得工学学士学位和硕士学位；2007年毕业于美国里海大学并获工学博士学位；历任美国旧金山州立大学教助理教授、副教授和教授。长期从事工程结构抗震领域的教学与科研工作。在美国国家自然科学基金项目等课题的资助下，在结构动力学、新型抗震试验方法、结构减震和结构实时混合模拟试验的可靠性研究等方面取得了具有一定国际影响的创新性研究成果，已公开发表学术论文百余篇，其中SCI期刊收录论文60余篇，论文累计被引用2140余次(google scholar)。围绕工程结构实验方法，在基础理论、技术创新、应用引领等方面取得了显著成绩。