Open Access
ARTICLE
An Adaptive Substructure-Based Model Order Reduction Method for Nonlinear Seismic Analysis in OpenSees
Jian Wang1, 2, Ming Fang3, *, Hui Li1, 2
1 Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin, 150090, China.
2 Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin, 150090, China.
3 College of Shipbuilding Engineering, Harbin Engineering University, Harbin, 150001, China.
* Corresponding Author: Ming Fang. Email: .
Computer Modeling in Engineering & Sciences 2020, 124(1), 79-106. https://doi.org/10.32604/cmes.2020.09470
Received 18 December 2019; Accepted 09 March 2020; Issue published 19 June 2020
Abstract
Structural components may enter an initial-elastic state, a plastic-hardening state
and a residual-elastic state during strong seismic excitations. In the residual-elastic state,
structural components keep in an unloading/reloading stage that is dominated by a tangent
stiffness, thus structural components remain residual deformations but behave in an elastic
manner. It has a great potential to make model order reduction for such structural
components using the tangent-stiffness-based vibration modes as a reduced order basis. In this
paper, an adaptive substructure-based model order reduction method is developed to perform
nonlinear seismic analysis for structures that have a priori unknown damage distribution. This
method is able to generate time-varying substructures and make nonlinear model order
reduction for substructures in the residual-elastic phase. The finite element program OpenSees
has been extended to provide the adaptive substructure-based nonlinear seismic analysis. At
the low level of OpenSees framework, a new abstract layer is created to represent the
time-varying substructures and implement the modeling process of substructures. At the high
level of OpenSees framework, a new transient analysis class is created to implement the
solving process of substructure-based governing equations. Compared with the conventional
time step integration method, the adaptive substructure-based model order reduction method
can yield comparative results with a higher computational efficiency.
Keywords
Cite This Article
Wang, J., Fang, M., Li, H. (2020). An Adaptive Substructure-Based Model Order Reduction Method for Nonlinear Seismic Analysis in OpenSees.
CMES-Computer Modeling in Engineering & Sciences, 124(1), 79–106.
Citations