Ward R. Malisch Concrete Construction Symposium (Part 2)-The Un-Shored Composite Slab on Metal Deck Part III—Strategies for Producing Level Deflected Slabs (PDF)

The Un-Shored Composite Slab on Metal Deck Part III—Strategies for Producing Level Deflected Slabs (PDF)

Pdf Summary

The document outlines the presentation by Structural Services, Inc. at the WRM Symposium in Anaheim, CA, on October 17, 2017, focusing on improving levelness and managing deflection in steel structures. Key strategies include specification provisions, pre-and post-placement surveys, and design modifications to ensure optimal structural performance.<br /><br />The company emphasizes the importance of exactitude in specification provisions, including measuring fabricated camber in the shop and maintaining rigorous elevation tolerances in erected frames. Surveys are a crucial part of their process, conducted throughout different stages of construction to manage the relative elevation of column splices and beam-to-column connections effectively.<br /><br />They stress the necessity of adaptable design options such as cambering strategies to reduce the impact of deflection on structures. This includes implementing flexible column splice details and utilizing controlled strike-off methods. For precise control, survey data is used to respond to unanticipated construction behaviors.<br /><br />Different welding techniques are discussed, including full and partial penetration welds with specific tolerances for web and flange details. Their erection sequences involve detailed steps, such as shooting splice elevations, installing shims, and connecting structural components methodically to ensure accuracy.<br /><br />The presentation highlights the significance of managing deflection during the construction of an unshored structural steel slab on metal decks. It suggests strategies like maintaining design thickness at critical beam points and using loose shores to control beam movements. The approach benefits from the increased stiffness of composite sections post-concreting, which significantly reduces deflection.<br /><br />Finally, they conclude with a reflection on the challenges involved in achieving level steel slab-on-metal deck floors in unshored construction, noting that precise detailing is essential for success. The methodology presented aims to bolster structural integrity through carefully controlled processes and design adaptations.

Keywords

Structural Services Inc.

WRM Symposium

steel structures

levelness

deflection management

specification provisions

cambering strategies

survey data

welding techniques

unshored construction