报告题目：Investigation of Wind and Wind Loading on Structures: From Full-Scale and Laboratory Experiments to Analytical/Numerical Modeling报 告 人： 左德龙 美国德州理工大学 副教授
Many forms of wind exist in the atmospheric boundary layer of the earth. The extreme ones include severe thunderstorms, tornadoes and hurricanes, which often cause structural damages of the first-passage type. The assessment of wind loading by such extreme winds is challenging in that the winds in question often exhibit non-Gaussian and non-stationary characteristics while the conventional approach for the analysis of wind loading on structures is based on the assumption of the wind being Gaussian and Stationary. On the other hand, although non-extreme winds are often of the synoptic type and can be reasonably assumed to be Gaussian and Stationary, the wind loading on structures that are susceptible to this type of wind is often due to wind-structure interaction that is nonlinear in nature. Although such loading might not cause extreme failures, they can cause significant fatigue damages and jeopardize the safety and performance of the structures.
Addressing these challenges in the assessment of wind loading on structures requires full-scale measurements for understanding the prototype problems, testing of models of structures or structural components in the laboratory for quantification of the core parameters that describe the problems and, on this basis, analytical/numerical modeling for prediction of the loading and/or structural response. This presentation illustrates the application of these methods in the modeling and simulation of winds and wind loading on structures. Examples given included numerical modeling and simulation of nonstationary winds, laboratory simulation of tornado-like vortices and modeling of rain-wind-induced vibration of stay cables based on full-scale observations.
左德龙博士于1996 年从重庆交通学院（现重庆交通大学）港口与航道工程系毕业并获学士学位，并于1999年从同一学校桥梁工程系获得结构工程硕士学位。此后， 左博士赴美国约翰 · 霍普金斯大学（The Johns Hopkins University ）学习，并于2005年获该校土木工程博士学位。左博士于2006年加入德州理工大学（Texas Tech University），在该校土木，环境及环境工程系任教至今，2012年评为副教授。他的研究方向是风及结构风荷载，最近专注于结构极端风荷载及非线性流固耦合方面的研究。主持美国国家基金、德州及横向课题15项，发表期刊及会议论文50多篇。