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

Abstract

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.

Briefing: Construction of RC buildings – ICITECH's experience over the last 30 years

“…Some of the most frequently used methods are those by Grundy & Kabaila (1963), Duan & Chen (1995) and Fang et al (2001), who simplified all the construction stages into a one-dimensional model of springs arranged in a series to represent the behaviour of individual bays (see Figure 4). However, these methods left a lot of room for improvement and in most cases were not experimentally validated, or were not developed to be applied to certain construction processes such as clearing or partial striking (Adam et al, 2017;Buitrago et al, 2018b). In order to cover these needs, analytical calculation methods were developed in the line of research that was begun more than 30 years ago to estimate slab-shore load transmission and could be adapted to all the existing construction processes.…”

“…The construction of RC building structures and the different processes used to construct them have been widely studied since the mid 20 th century (Buitrago et al, 2018b). The method of shoring or propping successive storeys is usually by shoring the last two, three or four floors (Grundy & Kabaila, 1963;Adam et al, 2017).…”