Shore overloads during shoring removal

Azkune, M.; Puente, I.; Santilli, Adrián

doi:10.1016/j.engstruct.2010.08.007

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…The general strength requirement for removing the supporting formwork under horizontal members is a compressive strength of a minimum of 70% of the concrete's final (28 d) strength for members spanning up to 6 m, and 85% for spans over 6 m [107]. Shores are typically installed under horizontal forms to carry and transfer the loads from the slab downwards through the structure until sufficient strength has been achieved [108], as shown in Figure 2. For projects requiring early form stripping, reshoring may be applied to continue supporting the horizontal concrete members during construction [109].…”

Section: Form Strippingmentioning

confidence: 99%

Formwork Engineering for Sustainable Concrete Construction

Nilimaa,

Gamil,

Zhaka

2023

CivilEng

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This study provides a comprehensive review of the engineering challenges of formwork in concrete construction. The paper investigates different formwork systems, their design based on form pressure, and the difficulties of form stripping. Alternative binders are gaining more and more interest by opening new opportunities for sustainable concrete materials and their impact on form pressure and concrete setting is also investigated in this paper. The discussion involves several engineering challenges such as sustainability, safety, and economy, while it also explores previous case studies, and discusses future trends in formwork design. The findings pinpoint that choosing an appropriate formwork system depends significantly on project-specific constraints and that the development of innovative materials and technologies presents significant benefits but also new challenges, including the need for training and regulation. Current trends in formwork design and use show promising possibilities for the integration of digital technologies and the development of sustainable and ‘smart’ formwork systems. Continued research within the field has the possibility to explore new formwork materials and technologies, which will contribute to the implementation of more effective and sustainable practices in concrete construction.

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Section: Form Strippingmentioning

confidence: 99%

Formwork Engineering for Sustainable Concrete Construction

Nilimaa,

Gamil,

Zhaka

2023

CivilEng

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“…In 1994 Moragues et al [64] installed sensors on shores in two buildings to study slab-shore In 2001 Beeby [43,66] [61] 1974 Canada Lasisi & Ng [62] 1979 Canada Ambrose et al [63] 1994 USA Moragues et al [64] 1994 Spain Rosowsky et al [65] 1997 USA Beeby [43,66] 2001 UK Fang et al [44] 2001 China Vollum et al [67,78] 2002-2003 UK Puente et al [68] 2007 Spain Azkune et al [69,70] 2007-2010 Spain Alvarado et al [45,71] 2009 Spain Park et al [55] 2011 South Korea Gasch et al [72][73][74][75] 2012-2015 Spain Huang & Liu [76] 2014 China Zhang et al [19,77] 2016 Australia…”

Section: Experimental Studiesmentioning

confidence: 99%

Load transmission between slabs and shores during the construction of RC building structures – A review

Buitrago

Adam

Moragues

et al. 2018

Engineering Structures

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Shoring successive floors is at present the most frequently used technique when constructing reinforced concrete (RC) building structures. This technique allows the recently poured slabs to be supported by the lower slabs by means of shores. Considering the particular characteristics of shoring successive floors, it is very important to be able to estimate how loads are transmitted between shores and slabs in order to maintain adequate structural safety and avoid situations of risk or even collapse in buildings under construction. The transmission of loads from shores to slabs during all the construction stages is a complex phenomenon and has been the subject of numerous studies, especially in recent years. The research carried out to date has included experiments on full-scale buildings and the development of advanced numerical models, the estimation of the loads acting on slabs during construction, the definition of simplified calculation methods to estimate loads on slabs and shores during building construction and estimating the appropriate construction times taking into account the evolution of the mechanical properties of early-age concrete. This paper was conceived in order to give an answer to: 1) advances in the field of constructing RC building structures, 2) the growing interest of the scientific community, and 3) the need for the structural and construction engineering sector to have the tools available to increase the safety and design of building construction processes. The paper is unique in the field of RC building structures in that it is the widest, most complete and most ambitious review carried out to date and includes the most important advances in the study of slab-shore load transmissions. This work will be of interest 2 to researchers who wish to go deeper into the field of building construction, and to more experienced professionals who require all the up-to-date information in a single document. However, engineers, architects and builders could also find the paper an excellent guide that will help them to improve their daily work in the field of designing and constructing buildings.

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“…However, Liu et al (1988) showed that the simplified method given by Grundy and Kabaila (1963) is still accurate to an adequate degree. Azkune et al (2010) studied the shore removal pattern to check shore overloading. They showed that the overloads occurring due to early removal of shores could cause failure of the structure.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Shoring/Reshoring Levels in High-Rise Building Construction

Sohoni

Ghaffar

Matsagar

et al. 2018

Organization, Technology and Management in Construction: An International Journal

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Formwork system is a significant constituent and a basic requirement for high-rise cast-in-place reinforced concrete buildings. Usually, the builders are confronted with the decision to choose the safe, optimum number of levels of shores/reshores for a predetermined safety factor and given grade of concrete, giving due consideration to the cost of formwork system. In this study, MATLAB program is developed to calculate the load distribution between the interconnected slabs and levels of shore/reshore of a slab formwork based on a simplified method. This program is further modified by incorporating genetic algorithm for the optimization of cost of construction for high-rise building. The cost of level of shores and reshores per floor is defined as a function of cycle time which directly reflects the increase in the cost of construction. Various combinations of shore and reshore levels with several grades of concrete for various safety factors are checked to minimize the cost of construction. The optimization equation is solved using genetic algorithm considering appropriate constraints to practically ensure feasible solutions. The case of one level of shores and numerous levels of reshores is better than one level of reshores and numerous levels of shores. The result of certain combination of shore and reshore levels is not the same when the level numbers are reversed. A comparative study is carried out to check the optimum cost for various safety factors. The program is useful for the designers to decide the levels of shores and reshores with minimized cost without compromising the safety of construction.

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Shore overloads during shoring removal

Cited by 6 publications

References 5 publications

Formwork Engineering for Sustainable Concrete Construction

Formwork Engineering for Sustainable Concrete Construction

Load transmission between slabs and shores during the construction of RC building structures – A review

Optimization of Shoring/Reshoring Levels in High-Rise Building Construction

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