Optimising load transfer using temporary supports in monolithic construction

Milan Švolík; Peter Makýš; Patrik Šťastný; Marek Ďubek

doi:10.14311/AP.2024.64.0448

Authors

Milan Švolík Slovak University of Technology in Bratislava, Faculty of Civil Engineering, Department of Building Technology, Radlinského 11, 810 05 Bratislava, Slovakia
Peter Makýš Slovak University of Technology in Bratislava, Faculty of Civil Engineering, Department of Building Technology, Radlinského 11, 810 05 Bratislava, Slovakia
Patrik Šťastný Slovak University of Technology in Bratislava, Faculty of Civil Engineering, Department of Building Technology, Radlinského 11, 810 05 Bratislava, Slovakia https://orcid.org/0000-0002-1387-6197
Marek Ďubek Slovak University of Technology in Bratislava, Faculty of Civil Engineering, Department of Building Technology, Radlinského 11, 810 05 Bratislava, Slovakia

DOI:

https://doi.org/10.14311/AP.2024.64.0448

Keywords:

optimisation, monolithic construction, backpropping

Abstract

When constructing a ceiling slab, it is essential that the load is effectively transferred to the lower floors. However, challenges arise when the lower ceiling slabs do not meet the specified design strengths, potentially indicating inadequate load bearing capacity. This article explores a novel approach to solving this problem by using supports that are not traditionally used for slab formwork, but rather as backpropping mechanisms. These supports serve as static reinforcements for the ceiling slabs, optimising the load distribution. This article delves into the distinctive features of these supports and evaluates their potential impact on the overall structural integrity of the implemented design.

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References

M. Buitrago, J. M. Adam, J. J. Moragues, P. A. Calderón. Load transmission between slabs and shores during the construction of RC building structures – A review. Engineering Structures 173:951–959, 2018. https://doi.org/10.1016/j.engstruct.2018.07.046

Alphasafe.com.au. Propping | Back propping | Heavy duty propping | Building propping. [2024-08-01]. https://www.alphasafe.com.au/shop/category/propping/8606

O. S. Williams, R. A. Hamid, M. S. Misnan. Accident causal factors on the building construction sites: A review. International Journal of Built Environment & Sustainability 5(1):78–92, 2018. https://doi.org/10.11113/ijbes.v5.n1.248

C. Motter, A. Scanlon. Modeling of reinforced concrete two-way floor slab deflections due to construction loading. Journal of Structural Engineering 144(6):04018060, 2018. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002052

J. W. Rackham, G. Couchman, S. Hicks. Composite slabs and beams using steel decking: Best practice for design and construction. The Metal Cladding & Roofing Manufacturers Association, 2009. https://doi.org/10.13140/RG.2.2.15921.17767

M. Švolík. Analýza čiastočného oddebňovania stropných konštrukcií a statických podpier z pohľadu optimalizácie využitia [In Slovak; Analysis of partial removing of ceiling structures and static supports from the point of view optimization of use]. Advances in Architectural, Civil and Environmental Engineering pp. 104–111, 2022. [2024-08-01]. https://kis.stuba.sk/arl-stu/en/detailstu_us_cat-0100111-Analyza-ciastocnehooddebnovania-stropnych-konstrukcii-astatickych-podpier-z-pohladu-optimalizacie/

M. E. Haque, A. Mund. Loads on shores and slabs during multistory structure construction: An artificial neural network approach. In Proceedings of the 2002 American Society for Engineering Education Annual Conference & Exposition, pp. 7.819.1–7.819.8. 2002. https://doi.org/10.18260/1-2--10942

Early striking and improved backpropping: For efficient flat slab construction. British Cement Association, 2001. ISBN 978-0-7210-1556-9.

K. Valadon. What is back propping? Cassaform 2020. [2024-08-01]. https://www.cassaform.com.au/articles/what-isback-propping/

H. Ayoub, S. Karshenas. Survey results for concrete construction live loads on newly poured slabs. Journal of Structural Engineering 120(5):1543–1562, 1994. https://doi.org/10.1061/(ASCE)0733-9445(1994)120:5(1543)

C. Freitas, F. Almeida, A. Silva, W. Batista. Theoretical and experimental study of steel props used in concrete buildings. International Journal of Engineering and Technology 7(3):170–175, 2015. https://doi.org/10.7763/IJET.2015.V7.787

PERI Group. MULTIPROP [In Czech]. [2024-08-01]. https://www.peri.cz/produkty/leseni/podpernesystemy/multiprop.html

S. Barakat. Experimental compression tests on the stability of structural steel tabular props. Jordan Journal of Civil Engineering 5(1):107–117, 2011. [2024-08-01]. https://www.iiste.org/Journals/index.php/JJCE/article/view/17941

S. Alexander. Propping and loading of in-situ floors. Concrete 38(1):33–35, 2004.

R. Vollum. Investigation into preloads induced into props during their installation. Imperial College, London, 2008.

P. Pallett. Temporary works toolkit. Part 6: Backpropping of flat slabs – design issues and worked examples. The Structural Engineer 95(1):30–32, 2017. https://doi.org/10.56330/HBAS6818

P. Pallett. Guide to flat slab formwork and falsework. The Concrete Society, Crowthorne, UK, 2003.

P. Pallett. Temporary works toolkit. Part 4: An introduction to backpropping of flat slabs. The Structural Engineer 94(12):38–41, 2016. https://doi.org/10.56330/NWEY9704