12月16日上午，“Direct Determination of Dynamic Elastic Modulus and Poisson's Ratio of Timoshenko Prisms”学术报告会在土木楼212报告厅举行。本期学术报告会主讲人为美国西弗吉尼亚大学结构工程学Hung-Liang Chen教授，报告会由西安建筑科技大学土木工程学院门进杰教授主持，土木工程学院部分教师及近百名研究生参加了本期报告会。
门进杰教授主持报告会
在门进杰教授向大家简要地介绍主讲人后，同学们热烈地欢迎Hung-Liang Chen教授上台做演讲。陈教授首先表达了对于来到我校的喜悦心情，然后开始做学术报告。报告分为了七个内容：1）介绍，2）NDT无损检测方法，3）铁木辛柯梁震动模型，4）模型分析，5）测定实验介绍，6）实验数据分析，7)结论。
Hung-Liang Chen教授作学术报告
Hung-Liang Chen教授首先讲述了准确测量弹性模量和泊松比对于确保混凝土结构的结构完整性的重要性，并向大家介绍了ASTM C215-14这一种无损检测方法。Hung-Liang Chen教授在报告中提出了一种共振频率与泊松比之间的关系式。与工业标准提供的方程不同，这种关系式可以直接同时确定弹性模量和泊松比，无需迭代。这个关系式可以直接估计试件的第一弯曲模态和扭转模态之间的频率比。
报告会现场
然后，Hung-Liang Chen教授介绍了如何用实验方法计算泊松比和动态弯曲频率比的弹性模量，并分析了实验的可行性。在自由边界条件下，用精确的剪切形状因子确定了铁木辛柯梁振动频率方程的精确解。将精确解与ABAQUS三维有限元计算结果进行了比较，结果表明，精确解与三维有限元计算结果的差异在0.05%以内。
学生提问并与教授交流
Hung-Liang Chen教授所做的报告逻辑严谨、条理清晰，为我院研究生在科研道路的探究过程中做了很好的榜样，对于促进我院师生国际学术交流和学习具有重要的促进作用。
报告人介绍：
Dr. Hung-Liang (Roger) Chen received his M.S. and Ph.D. in structural engineering from Northwestern University, Evanston, IL, in 1985 and 1988, respectively. He joined West Virginia University in 1989 as an Assistant Professor and was promoted to Associate Professor with Tenure in 1995 and Professor in 2000. He has been involved extensively with research in structural dynamics, nondestructive evaluation (NDE), dynamic soil-structure interaction, and material characterization of concrete, composites, timber, and ceramic materials. He also has ongoing research in mass concrete, self-consolidating concrete, GFRP-reinforced CRCP, and NDE of wellbore cement. Dr. Chen has more than 150 technical publications and has received over 40 research awards with a total of about 4.7 million dollars as Principal Investigator. He has advised over 45 graduate students, including 11 Ph.D. students. He is active on several technical committees for the American Concrete Institute, the American Society of Civil Engineers, and the American Society for Nondestructive Testing (ASNT). He has received numerous honors and awards for his contributions in teaching and research. Dr. Chen is a Fellow of ASNT.
