Reshoring and Early-Age Building Behavior-Shoring-Reshoring Operations

Shoring-Reshoring Operations—Economy and Safety (PDF)

Pdf Summary

The presentation at the ACI Fall Convention 2017, delivered by Pericles C. Stivaros, focuses on the critical aspects of shoring and reshoring operations in multistory reinforced concrete (R/C) building construction, emphasizing both economic and safety considerations. Shoring and reshoring are essential techniques used to support formwork and distribute construction loads safely across multiple floors. This process allows concrete slabs to cure properly while supporting additional loads during construction.<br /><br />The presentation outlines the benefits of reshoring, such as distributing construction loads across several floors to maintain design load limits, reducing material costs by reusing forms, and providing more workspace for other trades due to fewer supported floors. However, improper or premature removal of shores and reshores, inadequate design, or over-design can lead to significant risks, such as structural failure, excessive deflections, cracking, and other safety and economic issues.<br /><br />Examples are given of structural collapses and excessive deflections in buildings where reshoring failed or was mishandled, highlighting the importance of adequate planning and design. The presentation also discusses how to achieve economic reshoring operations by focusing on constructability, form reuse, proper load understanding, and the significance of early-age concrete strength. <br /><br />It stresses the importance of designing a flexible yet robust shoring system and advocates for early form removal to expedite construction, reduce costs, and ensure safety. The talk concludes by emphasizing the need for close collaboration between engineers and contractors during planning and execution to ensure both the economy and the integrity of the structures.

Keywords

shoring

reshoring

reinforced concrete

construction safety

economic considerations

formwork support

load distribution

structural failure

early-age concrete strength

engineer-contractor collaboration