EESD seminar
Seminar by Prof. Xiaodan Ren (Tongji University) on Tuesday July 31st, 2:15pm in GC C2 413
Title: Simulation of Complex Cyclic Behavior for RC Structures Based on Two-Level Consistent Secant Operators
Abstract:
Two-level consistent secant operators are proposed for the nonlinear simulation of structures especially under cyclic loading. At the structural level, the quasi-Newton (Q-N) update of stiffness matrix is used to search the equilibrium of the overall system. At the material level, the general formulas of secant operators are proposed for the nonlinear material model. The consistency between the Q-N stiffness matrix at the structural level and the secant operator at the material level is proposed and considered as a good trade-off between efficiency and robustness. Applications are made to numerical examples that include strain-softening and cyclic loading. Significant improvements are demonstrated in relation to the full Newton methods and the inconsistent secant methods.
About the speaker:
Xiaodan Ren received his Ph.D. from Tongji University in 2011. He is currently an associate professor of structural engineering at College of Civil Engineering, Tongji University. Dr. Ren has co-authored more than 70 academic papers. He is also PI of two research projects granted by the National Natural Science Foundation of China. Dr. Ren have been working on damage mechanics and computational mechanics for more than 10 years. His current research involves damage theory for brittle and ductile materials, advanced numerical methods for the simulation of structures underdoing extreme events, bio-mechanics and bone mechanics.