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Model reduction for...
Model reduction for structures subjected to blast loading by use of dynamic substructuring
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- Andersson, Linus (author)
- Lund University,Lunds universitet,Byggnadsmekanik,Institutionen för byggvetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Structural Mechanics,Department of Construction Sciences,Departments at LTH,Faculty of Engineering, LTH
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- Persson, Peter (author)
- Lund University,Lunds universitet,Byggnadsmekanik,Institutionen för byggvetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Structural Mechanics,Department of Construction Sciences,Departments at LTH,Faculty of Engineering, LTH
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- Persson, Kent (author)
- Lund University,Lunds universitet,Byggnadsmekanik,Institutionen för byggvetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Structural Mechanics,Department of Construction Sciences,Departments at LTH,Faculty of Engineering, LTH
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Papadrakakis, Manolis (editor)
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Fragiadakis, Michalis (editor)
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Papadimitriou, Costas (editor)
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(creator_code:org_t)
- 2020
- 2020
- English 21 s.
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In: EURODYN 2020 - 11th International Conference on Structural Dynamics, Proceedings. - 2311-9020. - 9786188507210 ; 2, s. 2544-2564
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Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
Keyword
- Beam frame structure
- Blast loading
- Direct time-integration
- Dynamic sub structuring
Publication and Content Type
- kon (subject category)
- ref (subject category)
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