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Dynamic column loss analysis of reinforced concrete flat slabs

Russell, J.M.; Owen, J.S.; Hajirasouliha, I.

Authors

J.M. Russell j.russell.3@warwick.ac.ukj.m.russell

I. Hajirasouliha



Abstract

The sudden column loss idealisation is a useful design tool to assess structures for progressive collapse. As such an event is a dynamic problem, suitable account must be taken of these effects. This can either be achieved by a full dynamic analysis of the structure or a simplified static approach, with correction factors for the dynamic influence. This study aims to investigate the response of Reinforced Concrete (RC) flat slab structures after a column loss using experimentally validated Finite Element (FE) models. The nonlinear dynamic response of a structure after such an event is considered, including the redistribution of loads and displacement profile. These results are then compared to equivalent static cases in order to determine the Dynamic Amplification Factor (DAF). For the range of structures considered, the DAF was calculated as between 1.39 and 1.62 for displacements, with lower factors associated with a higher nonlinear response or slower column removal. Additionally, the shear forces in remaining columns may exceed 200% of their fully supported condition, with a different associated DAF. The effects of increasing the tensile strength of concrete due to high strain rates are also considered. Typical Dynamic Increase Factors (DIFs) based on the strain rates were up to 1.23, however, this only applied for a short time period, and in a limited area. Therefore, such effects do not significantly influence the response.

Citation

Russell, J., Owen, J., & Hajirasouliha, I. (2019). Dynamic column loss analysis of reinforced concrete flat slabs. Engineering Structures, 198, https://doi.org/10.1016/j.engstruct.2019.109453

Journal Article Type Article
Acceptance Date Jul 25, 2019
Online Publication Date Aug 3, 2019
Publication Date Nov 1, 2019
Deposit Date Aug 5, 2019
Publicly Available Date Aug 4, 2020
Journal Engineering Structures
Print ISSN 0141-0296
Electronic ISSN 1873-7323
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 198
Article Number 109453
DOI https://doi.org/10.1016/j.engstruct.2019.109453
Keywords Progressive Collapse; Column Loss; RC Flat Slab; Dynamic Amplification
Public URL https://nottingham-repository.worktribe.com/output/2391631
Publisher URL https://www.sciencedirect.com/science/article/pii/S014102961832861X
Additional Information This article is maintained by: Elsevier; Article Title: Dynamic column loss analysis of reinforced concrete flat slabs; Journal Title: Engineering Structures; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.engstruct.2019.109453; Content Type: article; Copyright: © 2019 Elsevier Ltd. All rights reserved.

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