Model reduction for structures subjected to blast loading by use of dynamic substructuring
(2020) 11th International Conference on Structural Dynamics, EURODYN 2020 In Proceedings of the International Conference on Structural Dynamic , EURODYN 2. p.2544-2564- Abstract
In the present study, strategies are developed to enable time-efficient models for structures subjected to blast loading, appropriate for use in a structural design process. Dynamic sub structuring is employed to obtain reduced models with localized nonlinearities, such as predefined plastic hinges in a beam column structure. The parts of the substructures that remains linear elastic are modeled by Ritz-vectors whereas parts with a nonlinear response are retained as physical degrees-of-freedom. Furthermore, a time-stepping method is presented that is shown to be suitable for reduced models including local and predefined rigid-plastic behavior. The proposed methodology is applied and demonstrated in a numerical example of a concrete... (More)
In the present study, strategies are developed to enable time-efficient models for structures subjected to blast loading, appropriate for use in a structural design process. Dynamic sub structuring is employed to obtain reduced models with localized nonlinearities, such as predefined plastic hinges in a beam column structure. The parts of the substructures that remains linear elastic are modeled by Ritz-vectors whereas parts with a nonlinear response are retained as physical degrees-of-freedom. Furthermore, a time-stepping method is presented that is shown to be suitable for reduced models including local and predefined rigid-plastic behavior. The proposed methodology is applied and demonstrated in a numerical example of a concrete frame structure. Both the well-established Craig-Bampton method and reduction bases enriched by so-called correction modes are evaluated. For the load case studied, it is shown that the standard Craig-Bampton technique is suitable for reducing the substructures. Furthermore, it is shown that only a few Ritz-vectors are needed to sufficiently describe the deformation of the structure. However, additional modes are needed to ensure an accurate representation of the interface forces between the substructures.
(Less)
- author
- Andersson, Linus LU ; Persson, Peter LU and Persson, Kent LU
- organization
- publishing date
- 2020
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Beam frame structure, Blast loading, Direct time-integration, Dynamic sub structuring
- host publication
- EURODYN 2020 - 11th International Conference on Structural Dynamics, Proceedings
- series title
- Proceedings of the International Conference on Structural Dynamic , EURODYN
- editor
- Papadrakakis, Manolis ; Fragiadakis, Michalis and Papadimitriou, Costas
- volume
- 2
- pages
- 21 pages
- publisher
- European Association for Structural Dynamics
- conference name
- 11th International Conference on Structural Dynamics, EURODYN 2020
- conference location
- Virtual, Athens, Greece
- conference dates
- 2020-11-23 - 2020-11-26
- external identifiers
-
- scopus:85098734165
- ISSN
- 2311-9020
- ISBN
- 9786188507210
- project
- Reduced Order Modeling and Substructuring - Applications in Nonlinear Structural Dynamics
- language
- English
- LU publication?
- yes
- id
- e6e16aa1-e29f-49cc-bfc8-671ed29c6072
- date added to LUP
- 2021-01-14 09:58:04
- date last changed
- 2024-03-05 18:54:21
@inproceedings{e6e16aa1-e29f-49cc-bfc8-671ed29c6072,
abstract = {{<p>In the present study, strategies are developed to enable time-efficient models for structures subjected to blast loading, appropriate for use in a structural design process. Dynamic sub structuring is employed to obtain reduced models with localized nonlinearities, such as predefined plastic hinges in a beam column structure. The parts of the substructures that remains linear elastic are modeled by Ritz-vectors whereas parts with a nonlinear response are retained as physical degrees-of-freedom. Furthermore, a time-stepping method is presented that is shown to be suitable for reduced models including local and predefined rigid-plastic behavior. The proposed methodology is applied and demonstrated in a numerical example of a concrete frame structure. Both the well-established Craig-Bampton method and reduction bases enriched by so-called correction modes are evaluated. For the load case studied, it is shown that the standard Craig-Bampton technique is suitable for reducing the substructures. Furthermore, it is shown that only a few Ritz-vectors are needed to sufficiently describe the deformation of the structure. However, additional modes are needed to ensure an accurate representation of the interface forces between the substructures.</p>}},
author = {{Andersson, Linus and Persson, Peter and Persson, Kent}},
booktitle = {{EURODYN 2020 - 11th International Conference on Structural Dynamics, Proceedings}},
editor = {{Papadrakakis, Manolis and Fragiadakis, Michalis and Papadimitriou, Costas}},
isbn = {{9786188507210}},
issn = {{2311-9020}},
keywords = {{Beam frame structure; Blast loading; Direct time-integration; Dynamic sub structuring}},
language = {{eng}},
pages = {{2544--2564}},
publisher = {{European Association for Structural Dynamics}},
series = {{Proceedings of the International Conference on Structural Dynamic , EURODYN}},
title = {{Model reduction for structures subjected to blast loading by use of dynamic substructuring}},
volume = {{2}},
year = {{2020}},
}