Plenary Lecture
Geometrical Nonlinear Analysis of Slender Micro Arch-Beams Pulled by Magnetic Forces
Professor J.D. Yau
Department of Architecture
Tamkang University
New Taipei City, TAIWAN
E-mail: jdyau@mail.tku.edu.tw
Abstract: In this study, a nonlinear model of micro-arch beams under the action of electrostatic loadings with an initial air gap is presented. Based on the well-developed 3D beam theory proposed by Yang and Kuo [1], the arch beam is modelled as a series of uniform straight beam elements and the pull-in magnetic force is simulated as an electric-induced force by an electrode lying. Then the nonlinear structural analysis of snap-through and pull-in stability for a simply supported shallow arch subjected to a concentrated electrostatic loading will be investigated. To tackle the path-dependent features of electric forces due to presence of air gaps and nonlinear deformations, this study regards the electric forces as pseudo-forces acting at the arch-beam and solves the structure equations using an incremental-iterative procedure. From the numerical results, the present approach demonstrates that the micro-arch beam has the capacity to withstand further electrostatic loading after the snap-through jump
Brief Biography of the Speaker: Dr. J.D. Yau got his Ph.D. from National Taiwan University (NTU) in 1996. After serving as a chair-engineer at the Kuan-Tech Eng Consult Co. in Taiwan (1997-1999), he joined the faculty at TamKang University (TKU, 1999) where he has served as Assistant Professor (1999-2003), Associate Professor (2003-09), and Chair (2004-2007) in the Department of Architecture and Building Technology. In 2010, Dr. Yau became a Professor of TKU, and an Adjunct Professor of Zhejiang University (2011-), a Visiting Professor of East China Jiao Tong University in China (2011-). He is also a Supervisor of the Chinese Taiwan Association of Wind Engineering (CTAWE, 2014-). Dr. Yau has published over 60 referred journal papers and articles. His major research area is centered on vibrations of high speed rails, nonlinear geometric analysis of framed structures.
Selected publications (2017~2019):
1. L Liu, J Qin, Q Liu, JD Yau*, R Song (2019) Spectral analysis of train-rail-bridge coupling system considering frequency-dependent stiffness of rail fastening systems, Journal of Marine Science and Technology, 27(2), 114-122.
2. Y.B. Yang, JD Yau*, S. Urushdaze (2019). Wave transmission of linked railcars moving over multi simple beams under dual resonance. Journal of Sound and Vibration 452, 51-57.
3. JD Yau*, MD Martínez-Rodrigo, A Doménech (2019). An equivalent additional damping approach to assess vehicle-bridge interaction for train-induced vibration of short-span railway bridges. Engineering Structures 188, 469-479.
4. J.D. Yau*, YB Yang, S. Urushadze (2019), Scanning the modal coupling of slender suspension footbridges by a virtual moving vehicle, Engineering Structures, 180, 574–585.